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PythonPEP8代码规范常见问题有哪些

这篇文章主要为大家展示了“Python PEP8代码规范常见问题有哪些”，内容简而易懂，条理清晰，希望能够帮助大家解决疑惑，下面让小编带领大家一起研究并学习一下“Python PEP8代码规范常见问题有哪些”这篇文章吧。

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  • PEP 8: no newline at end of file
    解决方法：代码末尾需要另起一行，光标移到最后回车即可

  • PEP 8: indentation is not a multiple of four
    解决方法：缩进不是4的倍数，检查缩进

  • PEP 8: over-indented
    解决方法：过度缩进，检查缩进

  • PEP 8: missing whitespace after’,’
    解决方法：逗号后面少了空格，添加空格即可，类似还有分号或者冒号后面少了空格

  • PEP 8: multiple imports on one line
    解决方法：不要在一句 import 中引用多个库，举例：import socket, urllib.error最好写成：import socket import urllib.error

  • PEP 8: blank line at end of line
    解决方法：代码末尾行多了空格，删除空格即可

  • PEP 8: at least two spaces before inline comment
    解决方法：代码与注释之间至少要有两个空格

  • PEP 8: block comment should start with ‘#’
    解决方法：注释要以#加一个空格开始

  • PEP 8: inline comment should start with ‘#’
    解决方法：注释要以#加一个空格开始

  • PEP 8: module level import not at top of file
    解决方法：import不在文件的最上面，可能之前还有其它代码

  • PEP 8: expected 2 blank lines，found 0
    解决方法：需要两条空白行，添加两个空白行即可

  • PEP 8: function name should be lowercase
    解决方法：函数名改成小写即可

  • PEP 8: missing whitespace around operator
    解决方法：操作符（’=’、’>’、’<’等）前后缺少空格，加上即可

  • PEP 8: unexpected spaces around keyword / parameter equals
    解决方法：关键字/参数等号周围出现意外空格，去掉空格即可

  • PEP 8: multiple statements on one line (colon)
    解决方法：多行语句写到一行了，比如：if x == 2: print('OK')要分成两行写

  • PEP 8: line too long (82 > 79 characters)
    解决方法：超过了每行的最大长度限制79

如果想要选择性忽略PEP8代码风格的警告信息可以使用以下方法：（养成良好的习惯，编写规范的代码！不推荐忽略！）

①将鼠标移到出现警告信息的地方，按 alt+Enter，选择忽略（Ignore）这个错误即可：
Python PEP8代码规范常见问题有哪些
②依次选择 File - Settings - Editor - Inspections，在 Python下找到 PEP8 coding style violation 选项，在右下角的 Ignore errors里点击加号可以添加需要忽略的警告信息ID（ID信息见后面附录），例如想要忽略indentation contains mixed spaces and tabs这个警告，只需要添加其ID：E101 即可
Python PEP8代码规范常见问题有哪些
附录：全部警告信息以及对应的ID，官方地址：https://pep8.readthedocs.io/en/latest/intro.html#error-codes

codesample message
E1Indentation
E101indentation contains mixed spaces and tabs
E111indentation is not a multiple of four
E112expected an indented block
E113unexpected indentation
E114indentation is not a multiple of four (comment)
E115expected an indented block (comment)
E116unexpected indentation (comment)
E117over-indented
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
E2Whitespace
E201whitespace after ‘(‘
E202whitespace before ‘)’
E203whitespace before ‘:’
E211whitespace before ‘(‘
E221multiple spaces before operator
E222multiple spaces after operator
E223tab before operator
E224tab after operator
E225missing whitespace around operator
E226 (*)missing whitespace around arithmetic operator
E227missing whitespace around bitwise or shift operator
E228missing whitespace around modulo operator
E231missing whitespace after ‘,’, ‘;’, or ‘:’
E241 (*)multiple spaces after ‘,’
E242 (*)tab after ‘,’
E251unexpected spaces around keyword / parameter equals
E261at least two spaces before inline comment
E262inline comment should start with ‘# ‘
E265block comment should start with ‘# ‘
E266too many leading ‘#’ for block comment
E271multiple spaces after keyword
E272multiple spaces before keyword
E273tab after keyword
E274tab before keyword
E275missing whitespace after keyword
E3Blank line
E301expected 1 blank line, found 0
E302expected 2 blank lines, found 0
E303too many blank lines (3)
E304blank lines found after function decorator
E305expected 2 blank lines after end of function or class
E306expected 1 blank line before a nested definition
E4Import
E401multiple imports on one line
E402module level import not at top of file
E5Line length
E501 (^)line too long (82 > 79 characters)
E502the backslash is redundant between brackets
E7Statement
E701multiple statements on one line (colon)
E702multiple statements on one line (semicolon)
E703statement 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:’
E713test for membership should be ‘not in’
E714test for object identity should be ‘is not’
E721 (^)do not compare types, use ‘isinstance()’
E722do not use bare except, specify exception instead
E731do not assign a lambda expression, use a def
E741do not use variables named ‘l’, ‘O’, or ‘I’
E742do not define classes named ‘l’, ‘O’, or ‘I’
E743do not define functions named ‘l’, ‘O’, or ‘I’
E9Runtime
E901SyntaxError or IndentationError
E902IOError
W1Indentation warning
W191indentation contains tabs
W2Whitespace warning
W291trailing whitespace
W292no newline at end of file
W293blank line contains whitespace
W3Blank line warning
W391blank line at end of file
W5Line break warning
W503 (*)line break before binary operator
W504 (*)line break after binary operator
W505 (*^)doc line too long (82 > 79 characters)
W6Deprecation warning
W601.has_key() is deprecated, use ‘in’
W602deprecated form of raising exception
W603‘<>’ is deprecated, use ‘!=’
W604backticks are deprecated, use ‘repr()’
W605invalid escape sequence ‘x’
W606‘async’ and ‘await’ are reserved keywords starting with Python 3.7

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