email.parser: Kw-only args are not supported yet by MicroPython.

email.parser/email/parser.py

@@ -16,7 +16,7 @@ from email._policybase import compat32
 
 
 class Parser:
-    def __init__(self, _class=Message, *, policy=compat32):
+    def __init__(self, _class=Message, policy=compat32):
         """Parser of RFC 2822 and MIME email messages.
 
         Creates an in-memory object tree representing the email message, which