default_encoding and sequencetypes as const in __init__

src/icalendar/__init__.py

@@ -1,3 +1,6 @@
+SEQUENCE_TYPES = (list, tuple)
+DEFAULT_ENCODING = 'utf-8'
+
 from icalendar.cal import (
     Calendar,
     Event,

src/icalendar/cal.py

@@ -21,9 +21,6 @@ from icalendar.prop import (
 )
 
 
-SequenceTypes = (list, tuple)
-
-
 ######################################
 # The component factory
 

src/icalendar/parser.py

@@ -8,11 +8,12 @@ conversion is attempted.
 """
 import re
 import logging
+from icalendar import DEFAULT_ENCODING
+from icalendar import SEQUENCE_TYPES
 from icalendar.caselessdict import CaselessDict
 
 
 logger = logging.getLogger('icalendar')
-SequenceTypes = (list, tuple)
 
 
 def escape_char(text):
@@ -105,7 +106,7 @@ def foldline(text, length=75, newline='\r\n'):
 def paramVal(val):
     """Returns a parameter value.
     """
-    if type(val) in SequenceTypes:
+    if type(val) in SEQUENCE_TYPES:
         return q_join(val)
     return dQuote(val)
 
@@ -117,8 +118,6 @@ QUNSAFE_CHAR = re.compile('[\x00-\x08\x0a-\x1f\x7F"]')
 FOLD = re.compile('(\r?\n)+[ \t]')
 NEWLINE = re.compile(r'\r?\n')
 
-DEFAULT_ENCODING = 'utf-8'
-
 
 def validate_token(name):
     match = NAME.findall(name)

src/icalendar/prop.py

@@ -48,6 +48,8 @@ from datetime import (
     tzinfo,
 )
 from dateutil.tz import tzutc
+from icalendar import SEQUENCE_TYPES
+from icalendar import DEFAULT_ENCODING
 from icalendar.caselessdict import CaselessDict
 from icalendar.parser import (
     Parameters,
@@ -56,11 +58,6 @@ from icalendar.parser import (
     tzid_from_dt,
 )
 
-
-SequenceTypes = (list, tuple)
-
-DEFAULT_ENCODING = 'utf-8'
-
 DATE_PART = r'(\d+)D'
 TIME_PART = r'T(?:(\d+)H)?(?:(\d+)M)?(?:(\d+)S)?'
 DATETIME_PART = '(?:%s)?(?:%s)?' % (DATE_PART, TIME_PART)
@@ -648,11 +645,10 @@ class vRecur(CaselessDict):
         self.params = Parameters()
 
     def to_ical(self):
-        # SequenceTypes
         result = []
         for key, vals in self.sorted_items():
             typ = self.types[key]
-            if not type(vals) in SequenceTypes:
+            if not type(vals) in SEQUENCE_TYPES:
                 vals = [vals]
             vals = ','.join([typ(val).to_ical() for val in vals])
             result.append('%s=%s' % (key, vals))
@@ -685,7 +681,7 @@ class vText(unicode):
 
     def __new__(cls, value, encoding=DEFAULT_ENCODING):
         if isinstance(value, unicode):
-            value = value.encode(DEFAULT_ENCODING)
+            value = value.encode(encoding)
         self = super(vText, cls).__new__(cls, value, encoding=encoding)
         self.encoding = encoding
         self.params = Parameters()