# 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