python基础autopep8__python代码规范

关于PEP 8

PEP 8，Style Guide for Python Code，是Python官方推出编码约定，主要是为了保证 Python 编码的风格一致，提高代码的可读性。

官网地址：https://www.python.org/dev/peps/pep-0008/

关于Autopep8

Autopep8是自动将Python代码格式化为符合PEP 8风格的工具。它使用pycodestyle工具来确定代码的哪些部分需要被格式化。Autopep8能够修复大部分pycodestyle检测的格式问题。

github地址：https://github.com/hhatto/autopep8

安装：

pip install autopep8

使用命令：

autopep8 --in-place --aggressive --aggressive <filename>

参数说明：

>usage: autopep8 [-h] [--version] [-v] [-d] [-i] [--global-config filename]
>                 [--ignore-local-config] [-r] [-j n] [-p n] [-a]
>                 [--experimental] [--exclude globs] [--list-fixes]
>                 [--ignore errors] [--select errors] [--max-line-length n]
>                 [--line-range line line]
>                 [files [files ...]]
>
> Automatically formats Python code to conform to the PEP 8 style guide.
>
> positional arguments:
>   files                 files to format or '-' for standard in
>
> optional arguments:
>   -h, --help            show this help message and exit
>   --version             show program's version number and exit
>   -v, --verbose         print verbose messages; multiple -v result in more
>                         verbose messages
>   -d, --diff            print the diff for the fixed source
>   -i, --in-place        make changes to files in place
>   --global-config filename
>                         path to a global pep8 config file; if this file does
>                         not exist then this is ignored (default:
>                         ~/.config/pep8)
>   --ignore-local-config
>                         don't look for and apply local config files; if not
>                         passed, defaults are updated with any config files in
>                         the project's root directory
>   -r, --recursive       run recursively over directories; must be used with
>                         --in-place or --diff
>   -j n, --jobs n        number of parallel jobs; match CPU count if value is
>                         less than 1
>   -p n, --pep8-passes n
>                         maximum number of additional pep8 passes (default:
>                         infinite)
>   -a, --aggressive      enable non-whitespace changes; multiple -a result in
>                         more aggressive changes
>   --experimental        enable experimental fixes
>   --exclude globs       exclude file/directory names that match these comma-
>                         separated globs
>   --list-fixes          list codes for fixes; used by --ignore and --select
>   --ignore errors       do not fix these errors/warnings (default: E24)
>   --select errors       fix only these errors/warnings (e.g. E4,W)
>   --max-line-length n   set maximum allowed line length (default: 79)
>   --line-range line line, --range line line
>                         only fix errors found within this inclusive range of
>                         line numbers (e.g. 1 99); line numbers are indexed at