upgrade flake8 (#1040)

.flake8

@@ -1,69 +1,126 @@
 [flake8]
 
 ignore =
-  C407,  # unnecessary list comprehension; A generator only better than a list
-         # comprehension if we don't always need to iterate through all items in
-         # the generator (based on the use case).
-
+  # unnecessary list comprehension; A generator only better than a list
+  # comprehension if we don't always need to iterate through all items in
+  # the generator (based on the use case).
+  C407,
   # The following codes belong to pycodestyle, and overlap with black:
-  E101,  # indentation contains mixed spaces and tabs
-  E111,  # indentation is not a multiple of four
-  E112,  # expected an indented block
-  E113,  # unexpected indentation
-  E114,  # indentation is not a multiple of four (comment)
-  E115,  # expected an indented block (comment)
-  E116,  # unexpected indentation (comment)
-  E121,  # continuation line under-indented for hanging indent
-  E122,  # continuation line missing indentation or outdented
-  E123,  # closing bracket does not match indentation of opening bracket’s line
-  E124,  # closing bracket does not match visual indentation
-  E125,  # continuation line with same indent as next logical line
-  E126,  # continuation line over-indented for hanging indent
-  E127,  # continuation line over-indented for visual indent; is harmless
-         # (over-indent is visually unambiguous) and currently generates too
-         # many warnings for existing code.
-  E128,  # continuation line under-indented for visual indent
-  E129,  # visually indented line with same indent as next logical line
-  E131,  # continuation line unaligned for hanging indent
-  E133,  # closing bracket is missing indentation
-  E201,  # whitespace after ‘(‘
-  E202,  # whitespace before ‘)’
-  E203,  # whitespace before ‘:’; this warning is invalid for slices
-  E211,  # whitespace before ‘(‘
-  E221,  # multiple spaces before operator
-  E222,  # multiple spaces after operator
-  E223,  # tab before operator
-  E224,  # tab after operator
-  E225,  # missing whitespace around operator
-  E226,  # missing whitespace around arithmetic operator
-  E227,  # missing whitespace around bitwise or shift operator
-  E228,  # missing whitespace around modulo operator
-  E231,  # missing whitespace after ‘,’, ‘;’, or ‘:’
-  E241,  # multiple spaces after ‘,’
-  E242,  # tab after ‘,’
-  E251,  # unexpected spaces around keyword / parameter equals
-  E261,  # at least two spaces before inline comment
-  E262,  # inline comment should start with ‘# ‘
-  E265,  # block comment should start with ‘# ‘
-  E266,  # too many leading ‘#’ for block comment
-  E271,  # multiple spaces after keyword
-  E272,  # multiple spaces before keyword
-  E273,  # tab after keyword
-  E274,  # tab before keyword
-  E275,  # missing whitespace after keyword
-  E301,  # expected 1 blank line, found 0
-  E302,  # expected 2 blank lines, found 0
-  E303,  # too many blank lines (3)
-  E304,  # blank lines found after function decorator
-  E305,  # expected 2 blank lines after end of function or class
-  E306,  # expected 1 blank line before a nested definition
-  E401,  # multiple imports on one line
-  E501,  # line too long (> 79 characters)
-  E502,  # the backslash is redundant between brackets
-  E701,  # multiple statements on one line (colon)
-  E702,  # multiple statements on one line (semicolon)
-  E703,  # statement ends with a semicolon
-  E704,  # multiple statements on one line (def)
+  # indentation contains mixed spaces and tabs
+  E101,
+  # indentation is not a multiple of four
+  E111,
+  # expected an indented block
+  E112,
+  # unexpected indentation
+  E113,
+  # indentation is not a multiple of four (comment)
+  E114,
+  # expected an indented block (comment)
+  E115,
+  # unexpected indentation (comment)
+  E116,
+  # continuation line under-indented for hanging indent
+  E121,
+  # continuation line missing indentation or outdented
+  E122,
+  # closing bracket does not match indentation of opening bracket’s line
+  E123,
+  # closing bracket does not match visual indentation
+  E124,
+  # continuation line with same indent as next logical line
+  E125,
+  # continuation line over-indented for hanging indent
+  E126,
+  # continuation line over-indented for visual indent; is harmless
+  # (over-indent is visually unambiguous) and currently generates too
+  # many warnings for existing code.
+  E127,
+
+  # continuation line under-indented for visual indent
+  E128,
+  # visually indented line with same indent as next logical line
+  E129,
+  # continuation line unaligned for hanging indent
+  E131,
+  # closing bracket is missing indentation
+  E133,
+  # whitespace after ‘(‘
+  E201,
+  # whitespace before ‘)’
+  E202,
+  # whitespace before ‘:’; this warning is invalid for slices
+  E203,
+  # whitespace before ‘(‘
+  E211,
+  # multiple spaces before operator
+  E221,
+  # multiple spaces after operator
+  E222,
+  # tab before operator
+  E223,
+  # tab after operator
+  E224,
+  # missing whitespace around operator
+  E225,
+  # missing whitespace around arithmetic operator
+  E226,
+  # missing whitespace around bitwise or shift operator
+  E227,
+  # missing whitespace around modulo operator
+  E228,
+  # missing whitespace after ‘,’, ‘;’, or ‘:’
+  E231,
+  # multiple spaces after ‘,’
+  E241,
+  # tab after ‘,’
+  E242,
+  # unexpected spaces around keyword / parameter equals
+  E251,
+  # at least two spaces before inline comment
+  E261,
+  # inline comment should start with ‘# ‘
+  E262,
+  # block comment should start with ‘# ‘
+  E265,
+  # too many leading ‘#’ for block comment
+  E266,
+  # multiple spaces after keyword
+  E271,
+  # multiple spaces before keyword
+  E272,
+  # tab after keyword
+  E273,
+  # tab before keyword
+  E274,
+  # missing whitespace after keyword
+  E275,
+  # expected 1 blank line, found 0
+  E301,
+  # expected 2 blank lines, found 0
+  E302,
+  # too many blank lines (3)
+  E303,
+  # blank lines found after function decorator
+  E304,
+  # expected 2 blank lines after end of function or class
+  E305,
+  # expected 1 blank line before a nested definition
+  E306,
+  # multiple imports on one line
+  E401,
+  # line too long (> 79 characters)
+  E501,
+  # the backslash is redundant between brackets
+  E502,
+  # multiple statements on one line (colon)
+  E701,
+  # multiple statements on one line (semicolon)
+  E702,
+  # statement ends with a semicolon
+  E703,
+  # multiple statements on one line (def)
+  E704,
   # These are pycodestyle lints that black doesn't catch:
   # E711,  # comparison to None should be ‘if cond is None:’
   # E712,  # comparison to True should be ‘if cond is True:’ or ‘if cond:’
@@ -78,16 +135,25 @@ ignore =
   # I think these are internal to pycodestyle?
   # E901,  # SyntaxError or IndentationError
   # E902,  # IOError
-  F811,  # isn't aware of type-only imports, results in false-positives
-  W191,  # indentation contains tabs
-  W291,  # trailing whitespace
-  W292,  # no newline at end of file
-  W293,  # blank line contains whitespace
-  W391,  # blank line at end of file
-  W503,  # line break before binary operator; binary operator in a new line is
-         # the standard
-  W504,  # line break after binary operator
-  W505,  # not part of PEP8; doc line too long (> 79 characters)
+  # isn't aware of type-only imports, results in false-positives
+  F811,
+  # indentation contains tabs
+  W191,
+  # trailing whitespace
+  W291,
+  # no newline at end of file
+  W292,
+  # blank line contains whitespace
+  W293,
+  # blank line at end of file
+  W391,
+  # line break before binary operator; binary operator in a new line is
+  # the standard
+  W503,
+  # line break after binary operator
+  W504,
+  # not part of PEP8; doc line too long (> 79 characters)
+  W505,
   # These are pycodestyle lints that black doesn't catch:
   # W601,  # .has_key() is deprecated, use ‘in’
   # W602,  # deprecated form of raising exception

pyproject.toml

@@ -29,7 +29,7 @@ dev = [
     "coverage>=4.5.4",
     "build>=0.10.0",
     "fixit==2.0.0.post1",
-    "flake8>=3.7.8,<5",
+    "flake8==6.1.0",
     "Sphinx>=5.1.1",
     "hypothesis>=4.36.0",
     "hypothesmith>=0.0.4",