gh-102498 Clean up unused variables and imports in the email module (#102482)

* Clean up unused variables and imports in the email module

* Remove extra newline char

* Remove superflous dict+unpacking syntax

* Remove unused 'msg' var

* Clean up unused variables and imports in the email module

* Remove extra newline char

* Remove superflous dict+unpacking syntax

* Remove unused 'msg' var

---------

Co-authored-by: Barry Warsaw <barry@python.org>

Lib/email/_header_value_parser.py

@@ -1987,7 +1987,7 @@ def get_address_list(value):
         try:
             token, value = get_address(value)
             address_list.append(token)
-        except errors.HeaderParseError as err:
+        except errors.HeaderParseError:
             leader = None
             if value[0] in CFWS_LEADER:
                 leader, value = get_cfws(value)
@@ -2096,7 +2096,7 @@ def get_msg_id(value):
     except errors.HeaderParseError:
         try:
             token, value = get_no_fold_literal(value)
-        except errors.HeaderParseError as e:
+        except errors.HeaderParseError:
             try:
                 token, value = get_domain(value)
                 msg_id.defects.append(errors.ObsoleteHeaderDefect(
@@ -2443,7 +2443,6 @@ def get_parameter(value):
         raise errors.HeaderParseError("Parameter not followed by '='")
     param.append(ValueTerminal('=', 'parameter-separator'))
     value = value[1:]
-    leader = None
     if value and value[0] in CFWS_LEADER:
         token, value = get_cfws(value)
         param.append(token)
@@ -2568,7 +2567,7 @@ def parse_mime_parameters(value):
         try:
             token, value = get_parameter(value)
             mime_parameters.append(token)
-        except errors.HeaderParseError as err:
+        except errors.HeaderParseError:
             leader = None
             if value[0] in CFWS_LEADER:
                 leader, value = get_cfws(value)
@@ -2626,7 +2625,6 @@ def parse_content_type_header(value):
     don't do that.
     """
     ctype = ContentType()
-    recover = False
     if not value:
         ctype.defects.append(errors.HeaderMissingRequiredValue(
             "Missing content type specification"))

Lib/email/charset.py

@@ -341,7 +341,6 @@ class Charset:
                 if not lines and not current_line:
                     lines.append(None)
                 else:
-                    separator = (' ' if lines else '')
                     joined_line = EMPTYSTRING.join(current_line)
                     header_bytes = _encode(joined_line, codec)
                     lines.append(encoder(header_bytes))

Lib/email/feedparser.py

@@ -264,7 +264,7 @@ class FeedParser:
                         yield NeedMoreData
                         continue
                     break
-                msg = self._pop_message()
+                self._pop_message()
                 # We need to pop the EOF matcher in order to tell if we're at
                 # the end of the current file, not the end of the last block
                 # of message headers.

Lib/email/message.py

@@ -14,7 +14,7 @@ from io import BytesIO, StringIO
 # Intrapackage imports
 from email import utils
 from email import errors
-from email._policybase import Policy, compat32
+from email._policybase import compat32
 from email import charset as _charset
 from email._encoded_words import decode_b
 Charset = _charset.Charset

Lib/email/mime/text.py

@@ -6,7 +6,6 @@
 
 __all__ = ['MIMEText']
 
-from email.charset import Charset
 from email.mime.nonmultipart import MIMENonMultipart
 
 
@@ -36,6 +35,6 @@ class MIMEText(MIMENonMultipart):
                 _charset = 'utf-8'
 
         MIMENonMultipart.__init__(self, 'text', _subtype, policy=policy,
-                                  **{'charset': str(_charset)})
+                                  charset=str(_charset))
 
         self.set_payload(_text, _charset)