Flake8 and Pylint Codes and Messages

mccabe

• C901 x is too complex (#)

flake8_docstrings

(plugin wrapper to use pep257)

• D100 Public module missing
• D101 Public class missing
• D102 Public method missing
• D103 Public function missing
• D200 One-line docstrings should fit on one line with quotes
• D201 No blank lines allowed before docstring
• D202 No blank lines allowed after docstring
• D203 1 blank required before class docstring
• D204 1 blank required after class docstring
• D205 Blank line required between one-line summary and description
• D206 Docstring should be indented with spaces, not tabs
• D207 Docstring under-indented
• D208 Docstring over-indented
• D209 Put multi-line docstring closing quotes on separate line
• D300 Use """triple double quotes"""
• D301 Use r""" if any backslashes in your docstring
• D302 Use u""" for Unicode docstrings (Python 2 only)
• D400 First line should end with a period
• D401 First line should be in imperative mood
• D402 First line should not be the function's "signature"

pep8 (errors)

• E101 indentation has spaces & 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
• 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 operator missing whitespace
• E226 arithmetic operator missing whitespace
• E227 bitwise or shift operator missing whitespace
• E228 modulo missing whitespace
• E231 missing whitespace after ','
• 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
• 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
• E401 multiple imports on one line
• E501 line too long (82 > 79 characters)
• E502 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)
• 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()'
• E731 do not assign a lambda expression, use a def
• E901 SyntaxError or IndentationError
• E902 IOError

pyflakes

• 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
• 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

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 sections or imports

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
• N811 constant imported as non constant
• N812 lowercase imported as non lowercase
• N813 camelcase imported as lowercase
• N814 camelcase imported as constant

pep8 (warnings)

• 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
• W601 .has_key() is deprecated, use 'in'
• W602 deprecated form of raising exception
• W603 '<>' is deprecated, use '!='
• W604 backticks are deprecated, use 'repr()'

pylint

C

• C0102 Black listed name "%s"
• C0103 Invalid %s name "%s"
• C0111 Missing %s docstring
• C0112 Empty %s docstring
• C0121 Missing required attribute "%s"
• C0202 Class method %s should have cls as first argument
• C0203 Metaclass method %s should have mcs as first argument
• C0204 Metaclass class method %s should have %s as first argument
• C0301 Line too long (%s/%s)
• C0302 Too many lines in module (%s)
• C0303 Trailing whitespace
• C0304 Final newline missing
• C0321 More than one statement on a single line
• C0322 Old: Operator not preceded by a space
• C0323 Old: Operator not followed by a space
• C0324 Old: Comma not followed by a space
• C0325 Unnecessary parens after %r keyword
• C0326 %s space %s %s %s\n%s
• C1001 Old-style class defined

E

• E0001 (syntax error raised for a module; message varies)
• E0011 Unrecognized file option %r
• E0012 Bad option value %r
• E0100 __init__ method is a generator
• E0101 Explicit return in __init__
• E0102 %s already defined line %s
• E0103 %r not properly in loop
• E0104 Return outside function
• E0105 Yield outside function
• E0106 Return with argument inside generator
• E0107 Use of the non-existent %s operator
• E0108 Duplicate argument name %s in function definition
• E0202 An attribute affected in %s line %s hide this method
• E0203 Access to member %r before its definition line %s
• E0211 Method has no argument
• E0213 Method should have "self" as first argument
• E0221 Interface resolved to %s is not a class
• E0222 Missing method %r from %s interface
• E0235 __exit__ must accept 3 arguments: type, value, traceback
• E0501 Old: Non ascii characters found but no encoding specified (PEP 263)
• E0502 Old: Wrong encoding specified (%s)
• E0503 Old: Unknown encoding specified (%s)
• E0601 Using variable %r before assignment
• E0602 Undefined variable %r
• E0603 Undefined variable name %r in __all__
• E0604 Invalid object %r in __all__, must contain only strings
• E0611 No name %r in module %r
• E0701 Bad except clauses order (%s)
• E0702 Raising %s while only classes, instances or string are allowed
• E0710 Raising a new style class which does not inherit from BaseException
• E0711 NotImplemented raised - should raise NotImplementedError
• E0712 Catching an exception which does not inherit from BaseException: %s
• E1001 Use of __slots__ on an old style class
• E1002 Use of super on an old style class
• E1003 Bad first argument %r given to super()
• E1004 Missing argument to super()
• E1101 %s %r has no %r member
• E1102 %s is not callable
• E1103 %s %r has no %r member (but some types could not be inferred)
• E1111 Assigning to function call which does not return
• E1120 No value passed for parameter %s in function call
• E1121 Too many positional arguments for function call
• E1122 Old: Duplicate keyword argument %r in function call
• E1123 Passing unexpected keyword argument %r in function call
• E1124 Parameter %r passed as both positional and keyword argument
• E1125 Old: Missing mandatory keyword argument %r
• E1200 Unsupported logging format character %r (%#02x) at index %d
• E1201 Logging format string ends in middle of conversion specifier
• E1205 Too many arguments for logging format string
• E1206 Not enough arguments for logging format string
• E1300 Unsupported format character %r (%#02x) at index %d
• E1301 Format string ends in middle of conversion specifier
• E1302 Mixing named and unnamed conversion specifiers in format string
• E1303 Expected mapping for format string, not %s
• E1304 Missing key %r in format string dictionary
• E1305 Too many arguments for format string
• E1306 Not enough arguments for format string
• E1310 Suspicious argument in %s.%s call

F

• F0001 (error prevented analysis; message varies)
• F0002 %s: %s (message varies)
• F0003 ignored builtin module %s
• F0004 unexpected inferred value %s
• F0010 error while code parsing: %s
• F0202 Unable to check methods signature (%s / %s)
• F0220 failed to resolve interfaces implemented by %s (%s)
• F0321 Old: Format detection error in %r
• F0401 Unable to import %s

I

• I0001 Unable to run raw checkers on built-in module %s
• I0010 Unable to consider inline option %r
• I0011 Locally disabling %s
• I0012 Locally enabling %s
• I0013 Ignoring entire file
• I0014 Used deprecated directive "pylint:disable-all" or "pylint:disable=all"
• I0020 Suppressed %s (from line %d)
• I0021 Useless suppression of %s
• I0022 Deprecated pragma "pylint:disable-msg" or "pylint:enable-msg"

R

• R0201 Method could be a function
• R0401 Cyclic import (%s)
• R0801 Similar lines in %s files
• R0901 Too many ancestors (%s/%s)
• R0902 Too many instance attributes (%s/%s)
• R0903 Too few public methods (%s/%s)
• R0904 Too many public methods (%s/%s)
• R0911 Too many return statements (%s/%s)
• R0912 Too many branches (%s/%s)
• R0913 Too many arguments (%s/%s)
• R0914 Too many local variables (%s/%s)
• R0915 Too many statements (%s/%s)
• R0921 Abstract class not referenced
• R0922 Abstract class is only referenced %s times
• R0923 Interface not implemented

RP

• RP0001 Messages by category
• RP0002 % errors / warnings by module
• RP0003 Messages
• RP0004 Global evaluation
• RP0101 Statistics by type
• RP0401 External dependencies
• RP0402 Modules dependencies graph
• RP0701 Raw metrics
• RP0801 Duplication

W

• W0101 Unreachable code
• W0102 Dangerous default value %s as argument
• W0104 Statement seems to have no effect
• W0105 String statement has no effect
• W0106 Expression "%s" is assigned to nothing
• W0107 Unnecessary pass statement
• W0108 Lambda may not be necessary
• W0109 Duplicate key %r in dictionary
• W0110 map/filter on lambda could be replaced by comprehension
• W0120 Else clause on loop without a break statement
• W0121 Use raise ErrorClass(args) instead of raise ErrorClass, args.
• W0122 Use of exec
• W0141 Used builtin function %r
• W0142 Used * or ** magic
• W0150 %s statement in finally block may swallow exception
• W0199 Assert called on a tuple. Did you mean \'assert x,y\'?
• W0201 Attribute %r defined outside __init__
• W0211 Static method with %r as first argument
• W0212 Access to a protected member %s of a client class
• W0221 Arguments number differs from %s method
• W0222 Signature differs from %s method
• W0223 Method %r is abstract in class %r but is not overridden
• W0231 __init__ method from base class %r is not called
• W0232 Class has no __init__ method
• W0233 __init__ method from a non direct base class %r is called
• W0234 iter returns non-iterator
• W0301 Unnecessary semicolon
• W0311 Bad indentation. Found %s %s, expected %s
• W0312 Found indentation with %ss instead of %ss
• W0331 Use of the <> operator
• W0332 Use of "l" as long integer identifier
• W0333 Use of the `` operator
• W0401 Wildcard import %s
• W0402 Uses of a deprecated module %r
• W0403 Relative import %r, should be %r
• W0404 Reimport %r (imported line %s)
• W0406 Module import itself
• W0410 __future__ import is not the first non docstring statement
• W0511 (warning notes in code comments; message varies)
• W0512 Cannot decode using encoding "%s", unexpected byte at position %d
• W0601 Global variable %r undefined at the module level
• W0602 Using global for %r but no assignment is done
• W0603 Using the global statement
• W0604 Using the global statement at the module level
• W0611 Unused import %s
• W0612 Unused variable %r
• W0613 Unused argument %r
• W0614 Unused import %s from wildcard import
• W0621 Redefining name %r from outer scope (line %s)
• W0622 Redefining built-in %r
• W0623 Redefining name %r from %s in exception handler
• W0631 Using possibly undefined loop variable %r
• W0632 Possible unbalanced tuple unpacking with sequence%s: …
• W0633 Attempting to unpack a non-sequence%s
• W0701 Raising a string exception
• W0702 No exception type(s) specified
• W0703 Catching too general exception %s
• W0704 Except does not do anything
• W0710 Exception does not inherit from standard "Exception" class
• W0711 Exception to catch is the result of a binary "%s" operation
• W0712 Implicit unpacking of exceptions is not supported in Python 3
• W1001 Use of "property" on an old style class
• W1111 Assigning to function call which only returns None
• W1201 Specify string format arguments as logging function parameters
• W1300 Format string dictionary key should be a string, not %s
• W1301 Unused key %r in format string dictionary
• W1401 Anomalous backslash in string: \'%s\'. String constant might be missing an r prefix
• W1402 Anomalous Unicode escape in byte string: \'%s\'. String constant might be missing an r or u prefix
• W1501 "%s" is not a valid mode for open

Further Reading

• Free PDF Cheatsheets - https://dcjtech.info/topic/free-pdf-cheatsheets/
• Python Tools and Software - https://dcjtech.info/topic/python-tools-and-software/
• Python File-Extensions - https://dcjtech.info/topic/python-file-extensions/
• Optimizing Python Scripts - https://dcjtech.info/topic/optimizing-python-scripts/