diff --git a/mastodon/accounts.py b/mastodon/accounts.py
index 219edac..3d10088 100644
--- a/mastodon/accounts.py
+++ b/mastodon/accounts.py
@@ -66,7 +66,7 @@ class Mastodon(Internals):
             response = self.__api_request('POST', '/oauth/token', oauth_params, do_ratelimiting=False)
             temp_access_token = response['access_token']
         except Exception as e:
-            raise MastodonIllegalArgumentError('Invalid request during oauth phase: %s' % e)
+            raise MastodonIllegalArgumentError(f'Invalid request during oauth phase: {e}')
 
         # Step 2: Use that to create a user
         try:
@@ -74,7 +74,7 @@ class Mastodon(Internals):
             if "error" in response:
                 if return_detailed_error:
                     return None, response
-                raise MastodonIllegalArgumentError('Invalid request: %s' % e)
+                raise MastodonIllegalArgumentError(f'Invalid request: {e}')
             self.access_token = response['access_token']
             self.__set_refresh_token(response.get('refresh_token'))
             self.__set_token_expired(int(response.get('expires_in', 0)))            
@@ -88,7 +88,10 @@ class Mastodon(Internals):
                 received_scopes += _SCOPE_SETS[scope_set]
 
         if not set(scopes) <= set(received_scopes):
-            raise MastodonAPIError('Granted scopes "' + " ".join(received_scopes) + '" do not contain all of the requested scopes "' + " ".join(scopes) + '".')
+            raise MastodonAPIError(
+                f'Granted scopes "{" ".join(received_scopes)}" '
+                f'do not contain all of the requested scopes "{" ".join(scopes)}".'
+            )
 
         if to_file is not None:
             with open(to_file, 'w') as token_file:
@@ -124,8 +127,7 @@ class Mastodon(Internals):
         Returns a :ref:`account dict <account dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/accounts/{id}')
 
     @api_version("1.0.0", "2.1.0", _DICT_VERSION_ACCOUNT)
     def account_verify_credentials(self):
@@ -185,8 +187,7 @@ class Mastodon(Internals):
         if not exclude_reblogs:
             del params["exclude_reblogs"]
 
-        url = '/api/v1/accounts/{0}/statuses'.format(str(id))
-        return self.__api_request('GET', url, params)
+        return self.__api_request('GET', f'/api/v1/accounts/{id}/statuses', params)
 
     @api_version("1.0.0", "2.6.0", _DICT_VERSION_ACCOUNT)
     def account_following(self, id, max_id=None, min_id=None, since_id=None, limit=None):
@@ -206,8 +207,7 @@ class Mastodon(Internals):
             since_id = self.__unpack_id(since_id, dateconv=True)
 
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/accounts/{0}/following'.format(str(id))
-        return self.__api_request('GET', url, params)
+        return self.__api_request('GET', f'/api/v1/accounts/{id}/following', params)
 
     @api_version("1.0.0", "2.6.0", _DICT_VERSION_ACCOUNT)
     def account_followers(self, id, max_id=None, min_id=None, since_id=None, limit=None):
@@ -227,8 +227,7 @@ class Mastodon(Internals):
             since_id = self.__unpack_id(since_id, dateconv=True)
 
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/accounts/{0}/followers'.format(str(id))
-        return self.__api_request('GET', url, params)
+        return self.__api_request('GET', f'/api/v1/accounts/{id}/followers', params)
 
     @api_version("1.0.0", "1.4.0", _DICT_VERSION_RELATIONSHIP)
     def account_relationships(self, id):
@@ -269,8 +268,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/accounts/{0}/lists'.format(str(id))
-        return self.__api_request('GET', url, params)
+        return self.__api_request('GET', f'/api/v1/accounts/{id}/lists', params)
 
     @api_version("3.4.0", "3.4.0", _DICT_VERSION_ACCOUNT)
     def account_lookup(self, acct):
@@ -317,8 +315,7 @@ class Mastodon(Internals):
         if params["reblogs"] is None:
             del params["reblogs"]
 
-        url = '/api/v1/accounts/{0}/follow'.format(str(id))
-        return self.__api_request('POST', url, params)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/follow', params)
 
     @api_version("1.0.0", "2.1.0", _DICT_VERSION_ACCOUNT)
     def follows(self, uri):
@@ -338,7 +335,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/accounts/{0}/unfollow'.format(str(id)))
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/unfollow')
 
     @api_version("3.5.0", "3.5.0", _DICT_VERSION_RELATIONSHIP)
     def account_remove_from_followers(self, id):
@@ -349,7 +346,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` reflecting the updated following status.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/accounts/{0}/remove_from_followers'.format(str(id)))
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/remove_from_followers')
     
 
     @api_version("1.0.0", "1.4.0", _DICT_VERSION_RELATIONSHIP)
@@ -360,8 +357,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}/block'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/block')
 
     @api_version("1.0.0", "1.4.0", _DICT_VERSION_RELATIONSHIP)
     def account_unblock(self, id):
@@ -371,8 +367,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}/unblock'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/unblock')
 
     @api_version("1.1.0", "2.4.3", _DICT_VERSION_RELATIONSHIP)
     def account_mute(self, id, notifications=True, duration=None):
@@ -387,8 +382,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/accounts/{0}/mute'.format(str(id))
-        return self.__api_request('POST', url, params)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/mute', params)
 
     @api_version("1.1.0", "1.4.0", _DICT_VERSION_RELATIONSHIP)
     def account_unmute(self, id):
@@ -398,8 +392,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}/unmute'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/unmute', params)
 
     @api_version("1.1.1", "3.1.0", _DICT_VERSION_ACCOUNT)
     def account_update_credentials(self, display_name=None, note=None,
@@ -436,10 +429,8 @@ class Mastodon(Internals):
 
             fields_attributes = []
             for idx, (field_name, field_value) in enumerate(fields):
-                params_initial['fields_attributes[' +
-                               str(idx) + '][name]'] = field_name
-                params_initial['fields_attributes[' +
-                               str(idx) + '][value]'] = field_value
+                params_initial[f'fields_attributes[{idx}][name]'] = field_name
+                params_initial[f'fields_attributes[{idx}][value]'] = field_value
 
         # Clean up params
         for param in ["avatar", "avatar_mime_type", "header", "header_mime_type", "fields"]:
@@ -464,8 +455,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}/pin'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/pin')
 
     @api_version("2.5.0", "2.5.0", _DICT_VERSION_RELATIONSHIP)
     def account_unpin(self, id):
@@ -475,8 +465,7 @@ class Mastodon(Internals):
         Returns a :ref:`relationship dict <relationship dict>` containing the updated relationship to the user.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/accounts/{0}/unpin'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/unpin')
 
     @api_version("3.2.0", "3.2.0", _DICT_VERSION_RELATIONSHIP)
     def account_note_set(self, id, comment):
@@ -487,7 +476,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ["id"])
-        return self.__api_request('POST', '/api/v1/accounts/{0}/note'.format(str(id)), params)
+        return self.__api_request('POST', f'/api/v1/accounts/{id}/note', params)
 
     @api_version("3.3.0", "3.3.0", _DICT_VERSION_HASHTAG)
     def account_featured_tags(self, id):
@@ -497,4 +486,4 @@ class Mastodon(Internals):
         Returns a list of :ref:`hashtag dicts <hashtag dicts>` (NOT `featured tag dicts`_).
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', '/api/v1/accounts/{0}/featured_tags'.format(str(id)))
+        return self.__api_request('GET', f'/api/v1/accounts/{id}/featured_tags')
diff --git a/mastodon/admin.py b/mastodon/admin.py
index e2f5f20..422be35 100644
--- a/mastodon/admin.py
+++ b/mastodon/admin.py
@@ -142,7 +142,7 @@ class Mastodon(Internals):
         Returns that dict.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', '/api/v1/admin/accounts/{0}'.format(id))
+        return self.__api_request('GET', f'/api/v1/admin/accounts/{id}')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_enable(self, id):
@@ -152,7 +152,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/enable'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{id}/enable')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_approve(self, id):
@@ -162,7 +162,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/approve'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{id}/approve')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_reject(self, id):
@@ -172,7 +172,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>` for the account that is now gone.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/reject'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{id}/reject')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_unsilence(self, id):
@@ -182,7 +182,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/unsilence'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{id}/unsilence')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_unsuspend(self, id):
@@ -192,7 +192,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/unsuspend'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{id}/unsuspend')
 
     @api_version("3.3.0", "3.3.0", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_delete(self, id):
@@ -202,7 +202,7 @@ class Mastodon(Internals):
         The deleted accounts :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('DELETE', '/api/v1/admin/accounts/{0}'.format(id))
+        return self.__api_request('DELETE', f'/api/v1/admin/accounts/{id}')
 
     @api_version("3.3.0", "3.3.0", _DICT_VERSION_ADMIN_ACCOUNT)
     def admin_account_unsensitive(self, id):
@@ -212,7 +212,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`admin account dict <admin account dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/accounts/{0}/unsensitive'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/accounts/{f}/unsensitive')
 
     @api_version("2.9.1", "2.9.1", "2.9.1")
     def admin_account_moderate(self, id, action=None, report_id=None, warning_preset_id=None, text=None, send_email_notification=True):
@@ -248,8 +248,7 @@ class Mastodon(Internals):
 
         params["type"] = action
 
-        self.__api_request(
-            'POST', '/api/v1/admin/accounts/{0}/action'.format(id), params)
+        self.__api_request('POST', f'/api/v1/admin/accounts/{id}/action', params)
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_REPORT)
     def admin_reports(self, resolved=False, account_id=None, target_account_id=None, max_id=None, min_id=None, since_id=None, limit=None):
@@ -290,7 +289,7 @@ class Mastodon(Internals):
         Returns a :ref:`report dict <report dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', '/api/v1/admin/reports/{0}'.format(id))
+        return self.__api_request('GET', f'/api/v1/admin/reports/{id}')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_REPORT)
     def admin_report_assign(self, id):
@@ -300,7 +299,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`report dict <report dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/reports/{0}/assign_to_self'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/reports/{id}/assign_to_self')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_REPORT)
     def admin_report_unassign(self, id):
@@ -310,7 +309,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`report dict <report dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/reports/{0}/unassign'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/reports/{id}/unassign')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_REPORT)
     def admin_report_reopen(self, id):
@@ -320,7 +319,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`report dict <report dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/reports/{0}/reopen'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/reports/{id}/reopen')
 
     @api_version("2.9.1", "2.9.1", _DICT_VERSION_REPORT)
     def admin_report_resolve(self, id):
@@ -330,7 +329,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`report dict <report dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('POST', '/api/v1/admin/reports/{0}/resolve'.format(id))
+        return self.__api_request('POST', f'/api/v1/admin/reports/{id}/resolve')
 
     @api_version("3.5.0", "3.5.0", _DICT_VERSION_HASHTAG)
     def admin_trending_tags(self, limit=None):
@@ -376,7 +375,7 @@ class Mastodon(Internals):
         """
         if id is not None:
             id = self.__unpack_id(id)
-            return self.__api_request('GET', '/api/v1/admin/domain_blocks/{0}'.format(id))
+            return self.__api_request('GET', f'/api/v1/admin/domain_blocks/{id}')
         else:
             params = self.__generate_params(locals(),['limit'])
             return self.__api_request('GET', '/api/v1/admin/domain_blocks/', params)
@@ -430,7 +429,7 @@ class Mastodon(Internals):
             raise AttributeError("Must provide an id to modify the existing moderation actions on a given domain.")
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ["id"])
-        return self.__api_request('PUT', '/api/v1/admin/domain_blocks/{0}'.format(id), params)
+        return self.__api_request('PUT', f'/api/v1/admin/domain_blocks/{id}', params)
 
     @api_version("4.0.0", "4.0.0", _DICT_VERSION_ADMIN_DOMAIN_BLOCK)
     def admin_delete_domain_block(self, id=None):
@@ -443,7 +442,7 @@ class Mastodon(Internals):
         """
         if id is not None:
             id = self.__unpack_id(id)
-            self.__api_request('DELETE', '/api/v1/admin/domain_blocks/{0}'.format(id))
+            self.__api_request('DELETE', f'/api/v1/admin/domain_blocks/{id}')
         else:
             raise AttributeError("You must provide an id of an existing domain block to remove it.")
 
diff --git a/mastodon/authentication.py b/mastodon/authentication.py
index d4cb283..9f42587 100644
--- a/mastodon/authentication.py
+++ b/mastodon/authentication.py
@@ -61,13 +61,13 @@ class Mastodon(Internals):
             if website is not None:
                 request_data['website'] = website
             if session:
-                ret = session.post(api_base_url + '/api/v1/apps', data=request_data, timeout=request_timeout)
+                ret = session.post(f"{api_base_url}/api/v1/apps", data=request_data, timeout=request_timeout)
                 response = ret.json()
             else:
-                response = requests.post(api_base_url + '/api/v1/apps', data=request_data, timeout=request_timeout)
+                response = requests.post(f"{api_base_url}/api/v1/apps", data=request_data, timeout=request_timeout)
                 response = response.json()
         except Exception as e:
-            raise MastodonNetworkError("Could not complete request: %s" % e)
+            raise MastodonNetworkError(f"Could not complete request: {e}")
 
         if to_file is not None:
             with open(to_file, 'w') as secret_file:
@@ -325,11 +325,11 @@ class Mastodon(Internals):
             self.__set_token_expired(int(response.get('expires_in', 0)))
         except Exception as e:
             if username is not None or password is not None:
-                raise MastodonIllegalArgumentError('Invalid user name, password, or redirect_uris: %s' % e)
+                raise MastodonIllegalArgumentError(f'Invalid user name, password, or redirect_uris: {e}')
             elif code is not None:
-                raise MastodonIllegalArgumentError('Invalid access token or redirect_uris: %s' % e)
+                raise MastodonIllegalArgumentError(f'Invalid access token or redirect_uris: {e}')
             else:
-                raise MastodonIllegalArgumentError('Invalid request: %s' % e)
+                raise MastodonIllegalArgumentError(f'Invalid request: {e}')
 
         received_scopes = response["scope"].split(" ")
         for scope_set in _SCOPE_SETS.keys():
diff --git a/mastodon/conversations.py b/mastodon/conversations.py
index ba3ee61..5482fb7 100644
--- a/mastodon/conversations.py
+++ b/mastodon/conversations.py
@@ -39,5 +39,4 @@ class Mastodon(Internals):
         Returns the updated :ref:`conversation dict <conversation dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/conversations/{0}/read'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/conversations/{id}/read')
diff --git a/mastodon/filters.py b/mastodon/filters.py
index 5f373d4..8841ba8 100644
--- a/mastodon/filters.py
+++ b/mastodon/filters.py
@@ -29,8 +29,7 @@ class Mastodon(Internals):
         Returns a :ref:`filter dict <filter dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/filters/{0}'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/filters/{id}')
 
     @api_version("2.4.3", "2.4.3", _DICT_VERSION_FILTER)
     def filters_apply(self, objects, filters, context):
@@ -106,8 +105,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/filters/{0}'.format(str(id))
-        return self.__api_request('PUT', url, params)
+        return self.__api_request('PUT', f'/api/v1/filters/{id}', params)
 
     @api_version("2.4.3", "2.4.3", "2.4.3")
     def filter_delete(self, id):
@@ -115,5 +113,4 @@ class Mastodon(Internals):
         Deletes the filter with the given `id`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/filters/{0}'.format(str(id))
-        self.__api_request('DELETE', url)        
\ No newline at end of file
+        self.__api_request('DELETE', f'/api/v1/filters/{id}')
diff --git a/mastodon/hashtags.py b/mastodon/hashtags.py
index 89e8cac..f894c11 100644
--- a/mastodon/hashtags.py
+++ b/mastodon/hashtags.py
@@ -47,6 +47,4 @@ class Mastodon(Internals):
         Deletes one of the logged-in user's featured hashtags.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/featured_tags/{0}'.format(str(id))
-        self.__api_request('DELETE', url)
-                
\ No newline at end of file
+        self.__api_request('DELETE', f'/api/v1/featured_tags/{id}')
diff --git a/mastodon/instance.py b/mastodon/instance.py
index dfbbefb..1217596 100644
--- a/mastodon/instance.py
+++ b/mastodon/instance.py
@@ -156,8 +156,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
 
-        url = '/api/v1/announcements/{0}/dismiss'.format(str(id))
-        self.__api_request('POST', url)
+        self.__api_request('POST', f'/api/v1/announcements/{id}/dismiss')
 
     @api_version("3.1.0", "3.1.0", "3.1.0")
     def announcement_reaction_create(self, id, reaction):
@@ -171,9 +170,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
 
-        url = '/api/v1/announcements/{0}/reactions/{1}'.format(
-            str(id), reaction)
-        self.__api_request('PUT', url)
+        self.__api_request('PUT', f'/api/v1/announcements/{id}/reactions/{reaction}')
 
     @api_version("3.1.0", "3.1.0", "3.1.0")
     def announcement_reaction_delete(self, id, reaction):
@@ -184,6 +181,4 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
 
-        url = '/api/v1/announcements/{0}/reactions/{1}'.format(
-            str(id), reaction)
-        self.__api_request('DELETE', url)
+        self.__api_request('DELETE', f'/api/v1/announcements/{id}/reactions/{reaction}')
diff --git a/mastodon/internals.py b/mastodon/internals.py
index 758a1d4..d94a116 100644
--- a/mastodon/internals.py
+++ b/mastodon/internals.py
@@ -182,11 +182,10 @@ class Mastodon():
             base_url = base_url_override
 
         if self.debug_requests:
-            print('Mastodon: Request to endpoint "' + base_url +
-                    endpoint + '" using method "' + method + '".')
-            print('Parameters: ' + str(params))
-            print('Headers: ' + str(headers))
-            print('Files: ' + str(files))
+            print(f'Mastodon: Request to endpoint "{base_url}{endpoint}" using method "{method}".')
+            print(f'Parameters: {params}')
+            print(f'Headers: {headers}')
+            print(f'Files: {files}')
 
         # Make request
         request_complete = False
@@ -205,7 +204,7 @@ class Mastodon():
 
                 response_object = self.session.request(method, base_url + endpoint, **kwargs)
             except Exception as e:
-                raise MastodonNetworkError("Could not complete request: %s" % e)
+                raise MastodonNetworkError(f"Could not complete request: {e}")
 
             if response_object is None:
                 raise MastodonIllegalArgumentError("Illegal request.")
@@ -219,8 +218,7 @@ class Mastodon():
 
                 # For gotosocial, we need an int representation, but for non-ints this would crash
                 try:
-                    ratelimit_intrep = str(
-                        int(response_object.headers['X-RateLimit-Reset']))
+                    ratelimit_intrep = str(int(response_object.headers['X-RateLimit-Reset']))
                 except:
                     ratelimit_intrep = None
 
@@ -240,13 +238,13 @@ class Mastodon():
                         self.ratelimit_reset += server_time_diff
                         self.ratelimit_lastcall = time.time()
                 except Exception as e:
-                    raise MastodonRatelimitError("Rate limit time calculations failed: %s" % e)
+                    raise MastodonRatelimitError(f"Rate limit time calculations failed: {e}")
 
             # Handle response
             if self.debug_requests:
-                print('Mastodon: Response received with code ' + str(response_object.status_code) + '.')
-                print('response headers: ' + str(response_object.headers))
-                print('Response text content: ' + str(response_object.text))
+                print(f'Mastodon: Response received with code {response_object.status_code}.')
+                print(f'response headers: {response_object.headers}')
+                print(f'Response text content: {response_object.text}')
 
             if not response_object.ok:
                 try:
@@ -306,9 +304,9 @@ class Mastodon():
                     response = response_object.json(object_hook=self.__json_hooks)
                 except:
                     raise MastodonAPIError(
-                        "Could not parse response as JSON, response code was %s, "
-                        "bad json content was '%s'" % (response_object.status_code,
-                                                        response_object.content))
+                        f"Could not parse response as JSON, response code was {response_object.status_code}, "
+                        f"bad json content was {response_object.content!r}."
+                    )
             else:
                 response = response_object.content
 
@@ -413,8 +411,8 @@ class Mastodon():
                 url = "http://" + parse.netloc
             else:
                 raise MastodonAPIError(
-                    "Could not parse streaming api location returned from server: {}.".format(
-                        instance["urls"]["streaming_api"]))
+                    f"Could not parse streaming api location returned from server: {instance['urls']['streaming_api']}."
+                )
         else:
             url = self.api_base_url
         return url
@@ -436,16 +434,14 @@ class Mastodon():
 
         # Connect function (called and then potentially passed to async handler)
         def connect_func():
-            headers = {"Authorization": "Bearer " +
-                        self.access_token} if self.access_token else {}
+            headers = {"Authorization": "Bearer " + self.access_token} if self.access_token else {}
             if self.user_agent:
                 headers['User-Agent'] = self.user_agent
             connection = self.session.get(url + endpoint, headers=headers, data=params, stream=True,
                                             timeout=(self.request_timeout, timeout))
 
             if connection.status_code != 200:
-                raise MastodonNetworkError(
-                    "Could not connect to streaming server: %s" % connection.reason)
+                raise MastodonNetworkError(f"Could not connect to streaming server: {connection.reason}")
             return connection
         connection = None
 
@@ -638,7 +634,7 @@ class Mastodon():
             raise MastodonIllegalArgumentError('Could not determine mime type or data passed directly without mime type.')
         if file_name is None:
             random_suffix = uuid.uuid4().hex
-            file_name = "mastodonpyupload_" + str(time.time()) + "_" + str(random_suffix) + mimetypes.guess_extension(mime_type)
+            file_name = f"mastodonpyupload_{time.time()}_{random_suffix}{mimetypes.guess_extension(mime_type)}"
         return (file_name, media_file, mime_type)
 
     @staticmethod
diff --git a/mastodon/lists.py b/mastodon/lists.py
index 0882133..57ced46 100644
--- a/mastodon/lists.py
+++ b/mastodon/lists.py
@@ -26,7 +26,7 @@ class Mastodon(Internals):
         Returns a :ref:`list dict <list dict>`.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', '/api/v1/lists/{0}'.format(id))
+        return self.__api_request('GET', f'/api/v1/lists/{id}')
 
     @api_version("2.1.0", "2.6.0", _DICT_VERSION_ACCOUNT)
     def list_accounts(self, id, max_id=None, min_id=None, since_id=None, limit=None):
@@ -47,7 +47,7 @@ class Mastodon(Internals):
             since_id = self.__unpack_id(since_id, dateconv=True)
 
         params = self.__generate_params(locals(), ['id'])
-        return self.__api_request('GET', '/api/v1/lists/{0}/accounts'.format(id))
+        return self.__api_request('GET', f'/api/v1/lists/{id}/accounts')
 
     ###
     # Writing data: Lists
@@ -71,7 +71,7 @@ class Mastodon(Internals):
         """
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ['id'])
-        return self.__api_request('PUT', '/api/v1/lists/{0}'.format(id), params)
+        return self.__api_request('PUT', f'/api/v1/lists/{id}', params)
 
     @api_version("2.1.0", "2.1.0", "2.1.0")
     def list_delete(self, id):
@@ -79,7 +79,7 @@ class Mastodon(Internals):
         Delete a list.
         """
         id = self.__unpack_id(id)
-        self.__api_request('DELETE', '/api/v1/lists/{0}'.format(id))
+        self.__api_request('DELETE', f'/api/v1/lists/{id}')
 
     @api_version("2.1.0", "2.1.0", "2.1.0")
     def list_accounts_add(self, id, account_ids):
@@ -93,8 +93,7 @@ class Mastodon(Internals):
         account_ids = list(map(lambda x: self.__unpack_id(x), account_ids))
 
         params = self.__generate_params(locals(), ['id'])
-        self.__api_request(
-            'POST', '/api/v1/lists/{0}/accounts'.format(id), params)
+        self.__api_request('POST', f'/api/v1/lists/{id}/accounts', params)
 
     @api_version("2.1.0", "2.1.0", "2.1.0")
     def list_accounts_delete(self, id, account_ids):
@@ -108,5 +107,4 @@ class Mastodon(Internals):
         account_ids = list(map(lambda x: self.__unpack_id(x), account_ids))
 
         params = self.__generate_params(locals(), ['id'])
-        self.__api_request(
-            'DELETE', '/api/v1/lists/{0}/accounts'.format(id), params)
\ No newline at end of file
+        self.__api_request('DELETE', f'/api/v1/lists/{id}/accounts', params)
\ No newline at end of file
diff --git a/mastodon/media.py b/mastodon/media.py
index 3c815fb..41843a6 100644
--- a/mastodon/media.py
+++ b/mastodon/media.py
@@ -19,7 +19,7 @@ class Mastodon(Internals):
         to the logged-in user.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', '/api/v1/media/{0}'.format(str(id)))
+        return self.__api_request('GET', f'/api/v1/media/{id}')
 
     ###
     # Writing data: Media
@@ -57,7 +57,7 @@ class Mastodon(Internals):
             media_file, mime_type, file_name)}
 
         if focus is not None:
-            focus = str(focus[0]) + "," + str(focus[1])
+            focus = f"{focus[0]},{focus[1]}"
 
         if thumbnail is not None:
             if not self.verify_minimum_version("3.2.0", cached=True):
@@ -99,7 +99,7 @@ class Mastodon(Internals):
         id = self.__unpack_id(id)
 
         if focus is not None:
-            focus = str(focus[0]) + "," + str(focus[1])
+            focus = f"{focus[0]},{focus[1]}"
 
         params = self.__generate_params(
             locals(), ['id', 'thumbnail', 'thumbnail_mime_type'])
@@ -109,6 +109,6 @@ class Mastodon(Internals):
                 raise MastodonVersionError('Thumbnail requires version > 3.2.0')
             files = {"thumbnail": self.__load_media_file(
                 thumbnail, thumbnail_mime_type)}
-            return self.__api_request('PUT', '/api/v1/media/{0}'.format(str(id)), params, files=files)
+            return self.__api_request('PUT', f'/api/v1/media/{id}', params, files=files)
         else:
-            return self.__api_request('PUT', '/api/v1/media/{0}'.format(str(id)), params)
+            return self.__api_request('PUT', f'/api/v1/media/{id}', params)
diff --git a/mastodon/notifications.py b/mastodon/notifications.py
index f65b3fb..6d2d1f7 100644
--- a/mastodon/notifications.py
+++ b/mastodon/notifications.py
@@ -64,8 +64,7 @@ class Mastodon(Internals):
             return self.__api_request('GET', '/api/v1/notifications', params)
         else:
             id = self.__unpack_id(id)
-            url = '/api/v1/notifications/{0}'.format(str(id))
-            return self.__api_request('GET', url)
+            return self.__api_request('GET', f"/api/v1/notifications/{id}")
 
     ###
     # Writing data: Notifications
@@ -85,8 +84,7 @@ class Mastodon(Internals):
         id = self.__unpack_id(id)
 
         if self.verify_minimum_version("2.9.2", cached=True):
-            url = '/api/v1/notifications/{0}/dismiss'.format(str(id))
-            self.__api_request('POST', url)
+            self.__api_request('POST', f'/api/v1/notifications/{id}/dismiss')
         else:
             params = self.__generate_params(locals())
             self.__api_request('POST', '/api/v1/notifications/dismiss', params)
diff --git a/mastodon/polls.py b/mastodon/polls.py
index d974531..2722ba8 100644
--- a/mastodon/polls.py
+++ b/mastodon/polls.py
@@ -17,8 +17,7 @@ class Mastodon(Internals):
         Returns a :ref:`poll dict <poll dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/polls/{0}'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/polls/{id}')
 
     ###
     # Writing data: Polls
@@ -44,9 +43,8 @@ class Mastodon(Internals):
             choices = [choices]
         params = self.__generate_params(locals(), ['id'])
 
-        url = '/api/v1/polls/{0}/votes'.format(id)
-        self.__api_request('POST', url, params)
-    
+        self.__api_request('POST', f'/api/v1/polls/{id}/votes', params)
+
     def make_poll(self, options, expires_in, multiple=False, hide_totals=False):
         """
         Generate a poll object that can be passed as the `poll` option when posting a status.
diff --git a/mastodon/relationships.py b/mastodon/relationships.py
index 9cf15db..043174c 100644
--- a/mastodon/relationships.py
+++ b/mastodon/relationships.py
@@ -102,8 +102,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`relationship dict <relationship dict>` for the requesting account.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/follow_requests/{0}/authorize'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/follow_requests/{id}/authorize')
 
     @api_version("1.0.0", "3.0.0", _DICT_VERSION_RELATIONSHIP)
     def follow_request_reject(self, id):
@@ -113,8 +112,7 @@ class Mastodon(Internals):
         Returns the updated :ref:`relationship dict <relationship dict>` for the requesting account.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/follow_requests/{0}/reject'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/follow_requests/{id}/reject')
 
     ###
     # Writing data: Domain blocks
diff --git a/mastodon/statuses.py b/mastodon/statuses.py
index 36a7d2b..eb372d8 100644
--- a/mastodon/statuses.py
+++ b/mastodon/statuses.py
@@ -23,8 +23,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/statuses/{id}')
 
     @api_version("1.0.0", "3.0.0", _DICT_VERSION_CARD)
     def status_card(self, id):
@@ -45,8 +44,7 @@ class Mastodon(Internals):
             return self.status(id).card
         else:
             id = self.__unpack_id(id)
-            url = '/api/v1/statuses/{0}/card'.format(str(id))
-            return self.__api_request('GET', url)
+            return self.__api_request('GET', f'/api/v1/statuses/{id}/card')
 
     @api_version("1.0.0", "1.0.0", _DICT_VERSION_CONTEXT)
     def status_context(self, id):
@@ -58,8 +56,7 @@ class Mastodon(Internals):
         Returns a :ref:`context dict <context dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/context'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/statuses/{id}/context')
 
     @api_version("1.0.0", "2.1.0", _DICT_VERSION_ACCOUNT)
     def status_reblogged_by(self, id):
@@ -71,8 +68,7 @@ class Mastodon(Internals):
         Returns a list of :ref:`account dicts <account dicts>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/reblogged_by'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/statuses/{id}/reblogged_by')
 
     @api_version("1.0.0", "2.1.0", _DICT_VERSION_ACCOUNT)
     def status_favourited_by(self, id):
@@ -84,8 +80,7 @@ class Mastodon(Internals):
         Returns a list of :ref:`account dicts <account dicts>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/favourited_by'.format(str(id))
-        return self.__api_request('GET', url)
+        return self.__api_request('GET', f'/api/v1/statuses/{id}/favourited_by')
 
     ###
     # Reading data: Scheduled statuses
@@ -107,9 +102,8 @@ class Mastodon(Internals):
         Returns a :ref:`scheduled status dict <scheduled status dict>`.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/scheduled_statuses/{0}'.format(str(id))
-        return self.__api_request('GET', url)
-        
+        return self.__api_request('GET', f'/api/v1/scheduled_statuses/{id}')
+
     ###
     # Writing data: Statuses
     ###
@@ -150,7 +144,7 @@ class Mastodon(Internals):
         else:
             params_initial['visibility'] = params_initial['visibility'].lower()
             if params_initial['visibility'] not in valid_visibilities:
-                raise ValueError('Invalid visibility value! Acceptable values are %s' % valid_visibilities)
+                raise ValueError(f'Invalid visibility value! Acceptable values are {valid_visibilities}')
 
         if params_initial['language'] is None:
             del params_initial['language']
@@ -170,7 +164,7 @@ class Mastodon(Internals):
                 for media_id in media_ids:
                     media_ids_proper.append(self.__unpack_id(media_id))
             except Exception as e:
-                raise MastodonIllegalArgumentError("Invalid media dict: %s" % e)
+                raise MastodonIllegalArgumentError(f"Invalid media dict: {e}")
 
             params_initial["media_ids"] = media_ids_proper
 
@@ -187,7 +181,7 @@ class Mastodon(Internals):
             return self.__api_request('POST', '/api/v1/statuses', params, headers=headers, use_json=use_json)
         else:
             # Edit
-            return self.__api_request('PUT', '/api/v1/statuses/{0}'.format(str(self.__unpack_id(edit))), params, headers=headers, use_json=use_json)
+            return self.__api_request('PUT', f'/api/v1/statuses/{self.__unpack_id(edit)}', params, headers=headers, use_json=use_json)
 
     @api_version("1.0.0", "2.8.0", _DICT_VERSION_STATUS)
     def status_post(self, status, in_reply_to_id=None, media_ids=None,
@@ -303,7 +297,7 @@ class Mastodon(Internals):
         will have three, and so on.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', "/api/v1/statuses/{0}/history".format(str(id)))
+        return self.__api_request('GET', f"/api/v1/statuses/{id}/history")
 
     def status_source(self, id):
         """
@@ -314,7 +308,7 @@ class Mastodon(Internals):
         instead.
         """
         id = self.__unpack_id(id)
-        return self.__api_request('GET', "/api/v1/statuses/{0}/source".format(str(id)))
+        return self.__api_request('GET', f"/api/v1/statuses/{id}/source")
 
     @api_version("1.0.0", "2.8.0", _DICT_VERSION_STATUS)
     def status_reply(self, to_status, status, in_reply_to_id=None, media_ids=None,
@@ -372,8 +366,7 @@ class Mastodon(Internals):
         "delete and redraft" functionality)
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}'.format(str(id))
-        return self.__api_request('DELETE', url)
+        return self.__api_request('DELETE', f'/api/v1/statuses/{id}')
 
     @api_version("1.0.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_reblog(self, id, visibility=None):
@@ -390,12 +383,10 @@ class Mastodon(Internals):
         if 'visibility' in params:
             params['visibility'] = params['visibility'].lower()
             if params['visibility'] not in valid_visibilities:
-                raise ValueError('Invalid visibility value! Acceptable '
-                                 'values are %s' % valid_visibilities)
+                raise ValueError(f'Invalid visibility value! Acceptable values are {valid_visibilities}')
 
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/reblog'.format(str(id))
-        return self.__api_request('POST', url, params)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/reblog', params)
 
     @api_version("1.0.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_unreblog(self, id):
@@ -405,8 +396,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the status that used to be reblogged.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/unreblog'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/unreblog')
 
     @api_version("1.0.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_favourite(self, id):
@@ -416,8 +406,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the favourited status.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/favourite'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/favourite')
 
     @api_version("1.0.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_unfavourite(self, id):
@@ -427,8 +416,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the un-favourited status.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/unfavourite'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/unfavourite')
 
     @api_version("1.4.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_mute(self, id):
@@ -438,8 +426,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the now muted status
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/mute'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/mute')
 
     @api_version("1.4.0", "2.0.0", _DICT_VERSION_STATUS)
     def status_unmute(self, id):
@@ -449,8 +436,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the status that used to be muted.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/unmute'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/unmute')
 
     @api_version("2.1.0", "2.1.0", _DICT_VERSION_STATUS)
     def status_pin(self, id):
@@ -460,8 +446,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the now pinned status
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/pin'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/pin')
 
     @api_version("2.1.0", "2.1.0", _DICT_VERSION_STATUS)
     def status_unpin(self, id):
@@ -471,8 +456,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the status that used to be pinned.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/unpin'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/unpin')
 
     @api_version("3.1.0", "3.1.0", _DICT_VERSION_STATUS)
     def status_bookmark(self, id):
@@ -482,8 +466,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the now bookmarked status
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/bookmark'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/bookmark')
 
     @api_version("3.1.0", "3.1.0", _DICT_VERSION_STATUS)
     def status_unbookmark(self, id):
@@ -493,8 +476,7 @@ class Mastodon(Internals):
         Returns a :ref:`status dict <status dict>` with the status that used to be bookmarked.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/statuses/{0}/unbookmark'.format(str(id))
-        return self.__api_request('POST', url)
+        return self.__api_request('POST', f'/api/v1/statuses/{id}/unbookmark')
 
     ###
     # Writing data: Scheduled statuses
@@ -511,8 +493,7 @@ class Mastodon(Internals):
         scheduled_at = self.__consistent_isoformat_utc(scheduled_at)
         id = self.__unpack_id(id)
         params = self.__generate_params(locals(), ['id'])
-        url = '/api/v1/scheduled_statuses/{0}'.format(str(id))
-        return self.__api_request('PUT', url, params)
+        return self.__api_request('PUT', f'/api/v1/scheduled_statuses/{id}', params)
 
     @api_version("2.7.0", "2.7.0", "2.7.0")
     def scheduled_status_delete(self, id):
@@ -520,5 +501,4 @@ class Mastodon(Internals):
         Deletes a scheduled status.
         """
         id = self.__unpack_id(id)
-        url = '/api/v1/scheduled_statuses/{0}'.format(str(id))
-        self.__api_request('DELETE', url)
+        self.__api_request('DELETE', f'/api/v1/scheduled_statuses/{id}')
diff --git a/mastodon/streaming_endpoints.py b/mastodon/streaming_endpoints.py
index 9ff72f5..fc705e6 100644
--- a/mastodon/streaming_endpoints.py
+++ b/mastodon/streaming_endpoints.py
@@ -46,7 +46,7 @@ class Mastodon(Internals):
         base = '/api/v1/streaming/hashtag'
         if local:
             base += '/local'
-        return self.__stream("{}?tag={}".format(base, tag), listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
+        return self.__stream(f"{base}?tag={tag}", listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("2.1.0", "2.1.0", _DICT_VERSION_STATUS)
     def stream_list(self, id, listener, run_async=False, timeout=_DEFAULT_STREAM_TIMEOUT, reconnect_async=False, reconnect_async_wait_sec=_DEFAULT_STREAM_RECONNECT_WAIT_SEC):
@@ -55,7 +55,7 @@ class Mastodon(Internals):
         list.
         """
         id = self.__unpack_id(id)
-        return self.__stream("/api/v1/streaming/list?list={}".format(id), listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
+        return self.__stream(f"/api/v1/streaming/list?list={id}", listener, run_async=run_async, timeout=timeout, reconnect_async=reconnect_async, reconnect_async_wait_sec=reconnect_async_wait_sec)
 
     @api_version("2.6.0", "2.6.0", _DICT_VERSION_STATUS)
     def stream_direct(self, listener, run_async=False, timeout=_DEFAULT_STREAM_TIMEOUT, reconnect_async=False, reconnect_async_wait_sec=_DEFAULT_STREAM_RECONNECT_WAIT_SEC):
diff --git a/mastodon/suggestions.py b/mastodon/suggestions.py
index ab55993..a94204b 100644
--- a/mastodon/suggestions.py
+++ b/mastodon/suggestions.py
@@ -28,5 +28,4 @@ class Mastodon(Internals):
         Remove the user with the given `account_id` from the follow suggestions.
         """
         account_id = self.__unpack_id(account_id)
-        url = '/api/v1/suggestions/{0}'.format(str(account_id))
-        self.__api_request('DELETE', url)        
\ No newline at end of file
+        self.__api_request('DELETE', f'/api/v1/suggestions/{account_id}')
diff --git a/mastodon/timeline.py b/mastodon/timeline.py
index 04406ed..37790c8 100644
--- a/mastodon/timeline.py
+++ b/mastodon/timeline.py
@@ -50,8 +50,7 @@ class Mastodon(Internals):
             params_initial['local'] = True
 
         params = self.__generate_params(params_initial, ['timeline'])
-        url = '/api/v1/timelines/{0}'.format(timeline)
-        return self.__api_request('GET', url, params)
+        return self.__api_request('GET', f'/api/v1/timelines/{timeline}', params)
 
     @api_version("1.0.0", "3.1.4", _DICT_VERSION_STATUS)
     def timeline_home(self, max_id=None, min_id=None, since_id=None, limit=None, only_media=False, local=False, remote=False):
@@ -91,7 +90,7 @@ class Mastodon(Internals):
         if hashtag.startswith("#"):
             raise MastodonIllegalArgumentError(
                 "Hashtag parameter should omit leading #")
-        return self.timeline('tag/{0}'.format(hashtag), max_id=max_id, min_id=min_id, since_id=since_id, limit=limit, only_media=only_media, local=local, remote=remote)
+        return self.timeline(f'tag/{hashtag}', max_id=max_id, min_id=min_id, since_id=since_id, limit=limit, only_media=only_media, local=local, remote=remote)
 
     @api_version("2.1.0", "3.1.4", _DICT_VERSION_STATUS)
     def timeline_list(self, id, max_id=None, min_id=None, since_id=None, limit=None, only_media=False, local=False, remote=False):
@@ -101,5 +100,5 @@ class Mastodon(Internals):
         Returns a list of :ref:`status dicts <status dicts>`.
         """
         id = self.__unpack_id(id)
-        return self.timeline('list/{0}'.format(id), max_id=max_id, min_id=min_id, since_id=since_id, limit=limit, only_media=only_media, local=local, remote=remote)
+        return self.timeline(f'list/{id}', max_id=max_id, min_id=min_id, since_id=since_id, limit=limit, only_media=only_media, local=local, remote=remote)
 
diff --git a/mastodon/utility.py b/mastodon/utility.py
index 2510dca..200f5c1 100644
--- a/mastodon/utility.py
+++ b/mastodon/utility.py
@@ -39,14 +39,13 @@ def api_version(created_ver, last_changed_ver, return_value_ver):
                     version = max_version(last_changed_ver, return_value_ver)
                 major, minor, patch = parse_version_string(version)
                 if major > self.mastodon_major:
-                    raise MastodonVersionError("Version check failed (Need version " + version + ")")
+                    raise MastodonVersionError(f"Version check failed (Need version {version})")
                 elif major == self.mastodon_major and minor > self.mastodon_minor:
-                    raise MastodonVersionError("Version check failed (Need version " + version + ")")
+                    raise MastodonVersionError(f"Version check failed (Need version {version})")
                 elif major == self.mastodon_major and minor == self.mastodon_minor and patch > self.mastodon_patch:
-                    raise MastodonVersionError("Version check failed (Need version " + version + ", patch is " + str(self.mastodon_patch) + ")")
+                    raise MastodonVersionError(f"Version check failed (Need version {version}, patch is {self.mastodon_patch})")
             return function(self, *args, **kwargs)
-        function.__doc__ = function.__doc__ + "\n\n        *Added: Mastodon v" + \
-            created_ver + ", last changed: Mastodon v" + last_changed_ver + "*"
+        function.__doc__ += f"\n\n        *Added: Mastodon v{created_ver}, last changed: Mastodon v{last_changed_ver}*"
         return decorate(function, wrapper)
     return api_min_version_decorator
 
@@ -59,7 +58,7 @@ class AttribAccessDict(dict):
         if attr in self:
             return self[attr]
         else:
-            raise AttributeError("Attribute not found: " + str(attr))
+            raise AttributeError(f"Attribute not found: {attr}")
 
     def __setattr__(self, attr, val):
         if attr in self:
@@ -76,7 +75,7 @@ class AttribAccessList(list):
         if attr in self:
             return self[attr]
         else:
-            raise AttributeError("Attribute not found: " + str(attr))
+            raise AttributeError(f"Attribute not found: {attr}")
 
     def __setattr__(self, attr, val):
         if attr in self:
diff --git a/tests/test_create_app.py b/tests/test_create_app.py
index c7282df..97556c6 100644
--- a/tests/test_create_app.py
+++ b/tests/test_create_app.py
@@ -64,7 +64,7 @@ def test_app_account_create():
         test_app[1], 
         api_base_url="http://localhost:3000/"
     )
-    test_token = test_app_api.create_account("coolguy" + suffix, "swordfish", "email@localhost" + suffix, agreement=True)
+    test_token = test_app_api.create_account(f"coolguy{suffix}", "swordfish", f"email@localhost{suffix}", agreement=True)
     assert test_token
 
     # We can also test resending (marginally)
diff --git a/tests/test_pagination.py b/tests/test_pagination.py
index 9f26140..0c83fe4 100644
--- a/tests/test_pagination.py
+++ b/tests/test_pagination.py
@@ -16,7 +16,7 @@ UNLIKELY_HASHTAG = "fgiztsshwiaqqiztpmmjbtvmescsculuvmgjgopwoeidbcrixp"
 def many_statuses(api, n=10, suffix=''):
     statuses = list()
     for i in range(n):
-        status = api.status_post("Toot number {}!{}".format(i, suffix))
+        status = api.status_post(f"Toot number {i}!{suffix}")
         statuses.append(status)
     yield statuses
     for status in statuses:
@@ -102,10 +102,15 @@ def test_link_headers(api):
 
     _id='abc1234'
 
-    rmock.register_uri('GET', requests_mock.ANY, json=[{"foo": "bar"}], headers={"link":"""
-            <{base}/api/v1/timelines/tag/{tag}?max_id={_id}>; rel="next", <{base}/api/v1/timelines/tag/{tag}?since_id={_id}>; rel="prev"
-        """.format(base=api.api_base_url, tag=UNLIKELY_HASHTAG, _id=_id).strip()
-    })
+    rmock.register_uri(
+        'GET',
+        requests_mock.ANY,
+        json=[{"foo": "bar"}],
+        headers={
+            "link": f"<{api.api_base_url}/api/v1/timelines/tag/{UNLIKELY_HASHTAG}?max_id={_id}>; rel=\"next\", "
+                    f"<{api.api_base_url}/api/v1/timelines/tag/{UNLIKELY_HASHTAG}?since_id={_id}>; rel=\"prev\""
+        }
+    )
 
     resp = api.timeline_hashtag(UNLIKELY_HASHTAG)
     assert resp._pagination_next['max_id'] == _id
diff --git a/tests/test_status.py b/tests/test_status.py
index 8461bc3..56e7397 100644
--- a/tests/test_status.py
+++ b/tests/test_status.py
@@ -203,7 +203,7 @@ def test_scheduled_status_long_part1(api):
         else:
             the_medium_term_future = datetime.datetime.now() + datetime.timedelta(minutes=6)
             pickle.dump(the_medium_term_future.timestamp(), open("tests/cassettes_special/test_scheduled_status_long_datetimeobjects.pkl", 'wb'))
-        scheduled_toot = api.status_post("please ensure maximum headroom at " + str(the_medium_term_future), scheduled_at=the_medium_term_future)
+        scheduled_toot = api.status_post(f"please ensure maximum headroom at {the_medium_term_future}", scheduled_at=the_medium_term_future)
         scheduled_toot_list = api.scheduled_statuses()
         assert scheduled_toot.id in map(lambda x: x.id, scheduled_toot_list)
         pickle.dump(scheduled_toot.params.text, open("tests/cassettes_special/test_scheduled_status_long_text.pkl", 'wb'))