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shaowei-su/flake8-error-codes.md

Created November 6, 2019 00:38
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Medusa: Flake8 (and plugins) error codes reference
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flake8-error-codes.md

Error codes reference

pycodestyle

Indentation
  • 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
  • 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
Whitespace
  • E201: whitespace after '('
  • E202: whitespace before ')'
  • E203: whitespace before ':'
  • 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
Blank line
  • 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
Import
  • E401: multiple imports on one line
  • E402: module level import not at top of file
Line length
  • E501: line too long (82 > 79 characters)
  • E502: the backslash is redundant between brackets
Statement
  • 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)
  • E711: comparison to None should be 'if cond is None:'
  • E712: comparison to True should be 'if cond is True:' or 'if cond:'
  • E713: test for membership should be 'not in'
  • E714: test for object identity should be 'is not'
  • E721: do not compare types, use 'isinstance()'
  • E722: do not use bare except, specify exception instead
  • E731: do not assign a lambda expression, use a def
  • E741: do not use variables named 'l', 'O', or 'I'
  • E742: do not define classes named 'l', 'O', or 'I'
  • E743: do not define functions named 'l', 'O', or 'I'
Runtime
  • E901: SyntaxError or IndentationError
  • E902: IOError
Indentation warning
  • W191: indentation contains tabs
Whitespace warning
  • W291: trailing whitespace
  • W292: no newline at end of file
  • W293: blank line contains whitespace
Blank line warning
  • W391: blank line at end of file
Line break warning
  • W503: line break before binary operator
  • W504: line break after binary operator
  • W505: doc line too long (82 > 79 characters)
Deprecation warning
  • W601: .has_key() is deprecated, use 'in'
  • W602: deprecated form of raising exception
  • W603: '<>' is deprecated, use '!='
  • W604: backticks are deprecated, use 'repr()'
  • W605: invalid escape sequence '\x'
  • W606: 'async' and 'await' are reserved keywords starting with Python 3.7

pyflakes / flake8

  • F401: module imported but unused
  • F402: import module from line N shadowed by loop variable
  • F403: 'from module import *' used; unable to detect undefined names
  • F404: future import(s) name after other statements
  • F405: name may be undefined, or defined from star imports: module
  • F406: 'from module import *' only allowed at module level
  • F407: an undefined __future__ feature name was imported
  • F601: dictionary key name repeated with different values
  • F602: dictionary key variable name repeated with different values
  • F621: too many expressions in an assignment with star-unpacking
  • F622: two or more starred expressions in an assignment (a, *b, *c = d)
  • F631: assertion test is a tuple, which are always True
  • F701: a break statement outside of a while or for loop
  • F702: a continue statement outside of a while or for loop
  • F703: a continue statement in a finally block in a loop
  • F704: a yield or yield from statement outside of a function
  • F705: a return statement with arguments inside a generator
  • F706: a return statement outside of a function/method
  • F707: an except: block as not the last exception handler
  • F721: doctest syntax error
  • F722: syntax error in forward type annotation
  • F811: redefinition of unused name from line N
  • F812: list comprehension redefines name from line N
  • F821: undefined name name
  • F822: undefined name name in __all__
  • F823: local variable name ... referenced before assignment
  • F831: duplicate argument name in function definition
  • F841: local variable name is assigned to but never used
  • F901: raise NotImplemented should be raise NotImplementedError

mccabe

  • C901: Function is too complex

pep8-naming

  • N801: class names should use CapWords convention
  • N802: function name should be lowercase
  • N803: argument name should be lowercase
  • N804: first argument of a classmethod should be named 'cls'
  • N805: first argument of a method should be named 'self'
  • N806: variable in function should be lowercase
  • N807: function name should not start or end with '__'
  • N811: constant imported as non constant
  • N812: lowercase imported as non lowercase
  • N813: camelcase imported as lowercase
  • N814: camelcase imported as constant
  • N815: mixedCase variable in class scope
  • N816: mixedCase variable in global scope

flake8-docstrings (pydocstyle)

Missing Docstrings
  • D100: Missing docstring in public module
  • D101: Missing docstring in public class
  • D102: Missing docstring in public method
  • D103: Missing docstring in public function
  • D104: Missing docstring in public package
  • D105: Missing docstring in magic method
  • D106: Missing docstring in public nested class
  • D107: Missing docstring in __init__
Whitespace Issues
  • D200: One-line docstring should fit on one line with quotes
  • D201: No blank lines allowed before function docstring
  • D202: No blank lines allowed after function docstring
  • D203: 1 blank line required before class docstring
  • D204: 1 blank line required after class docstring
  • D205: 1 blank line required between summary line and description
  • D206: Docstring should be indented with spaces, not tabs
  • D207: Docstring is under-indented
  • D208: Docstring is over-indented
  • D209: Multi-line docstring closing quotes should be on a separate line
  • D210: No whitespaces allowed surrounding docstring text
  • D211: No blank lines allowed before class docstring
  • D212: Multi-line docstring summary should start at the first line
  • D213: Multi-line docstring summary should start at the second line
  • D214: Section is over-indented
  • D215: Section underline is over-indented
Quotes Issues
  • D300: Use """triple double quotes"""
  • D301: Use r""" if any backslashes in a docstring
  • D302: Use u""" for Unicode docstrings
Docstring Content Issues
  • D400: First line should end with a period
  • D401: First line should be in imperative mood
  • D401: First line should be in imperative mood; try rephrasing
  • D402: First line should not be the function's "signature"
  • D403: First word of the first line should be properly capitalized
  • D404: First word of the docstring should not be This
  • D405: Section name should be properly capitalized
  • D406: Section name should end with a newline
  • D407: Missing dashed underline after section
  • D408: Section underline should be in the line following the section's name
  • D409: Section underline should match the length of its name
  • D410: Missing blank line after section
  • D411: Missing blank line before section
  • D412: No blank lines allowed between a section header and its content
  • D413: Missing blank line after last section
  • D414: Section has no content

flake8-import-order

  • I100: Your import statements are in the wrong order.
  • I101: The names in your from import are in the wrong order.
  • I201: Missing newline between import groups.
  • I202: Additional newline in a group of imports.

flake8-quotes

  • Q000: Remove bad quotes
  • Q001: Remove bad quotes from multiline string
  • Q002: Remove bad quotes from docstring
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