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
1
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