按PEP8风格自动排版Python代码

如果用编辑器写代码，很容易会怎么顺手怎么来，而每个人的写代码习惯有很大不同，这样会导致可读性不是很好，代码维护起来比较困难，当然各种编辑器一般都有各种用来自动排版的插件，例如Sublime Text就有：Python PEP8 Autoformat，使用方法：

默认快捷键：

Ctrl + Shift + R

不过，python的一些install脚本还是很强大的，例如python的autopep8库：
（链接：https://github.com/hhatto/autopep8）

$ pip install --upgrade autopep8

然后在命令行：

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

就可以对代码进行pep8自动排版，对比了下效果，如下：


排版前

import math, sys;

def example1():
####This is a long comment. This should be wrapped to fit within 72 characters.
    some_tuple=(   1,2, 3,'a'  );
    some_variable={'long':'Long code lines should be wrapped within 79 characters.',
'other':[math.pi, 100,200,300,9876543210,'This is a long string that goes on'],
'more':{'inner':'This whole logical line should be wrapped.',some_tuple:[1,
20,300,40000,500000000,60000000000000000]}}
return (some_tuple, some_variable)
def example2(): return {'has_key() is deprecated':True}.has_key({'f':2}.has_key(''));
class Example3( object ):
def __init__ ( self, bar ):
#Comments should have a space after the hash.
if bar : bar+=1;  bar=bar* bar   ; return bar
else:
                    some_string = """
 Indentation in multiline strings should not be touched.
Only actual code should be reindented.
"""
return (sys.path, some_string)

使用Sublime Text中的Python PEP8 Autoformat自动排版

import math
import sys


def example1():
# This is a long comment. This should be wrapped to fit within 72
# characters.
    some_tuple = (1, 2, 3, 'a')
    some_variable = {'long': 'Long code lines should be wrapped within 79 characters.',
'other': [math.pi, 100, 200, 300, 9876543210, 'This is a long string that goes on'],
'more': {'inner': 'This whole logical line should be wrapped.', some_tuple: [1,
20, 300, 40000, 500000000, 60000000000000000]}}
return (some_tuple, some_variable)


def example2(): return {'has_key() is deprecated': True}.has_key(
    {'f': 2}.has_key(''))


class Example3(object):

def __init__(self, bar):
# Comments should have a space after the hash.
if bar:
            bar += 1
            bar = bar * bar
return bar
else:
            some_string = """
 Indentation in multiline strings should not be touched.
Only actual code should be reindented.
"""
return (sys.path, some_string)

使用autopep8自动排版

import math
import sys


def example1():
# This is a long comment. This should be wrapped to fit within 72
# characters.
    some_tuple = (1, 2, 3, 'a')
    some_variable = {
'long': 'Long code lines should be wrapped within 79 characters.',
'other': [
            math.pi,
100,
200,
300,
9876543210,
'This is a long string that goes on'],
'more': {
'inner': 'This whole logical line should be wrapped.',
            some_tuple: [
1,
20,
300,
40000,
500000000,
60000000000000000]}}
return (some_tuple, some_variable)


def example2(): return ('' in {'f': 2}) in {'has_key() is deprecated': True}


class Example3(object):
def __init__(self, bar):
# Comments should have a space after the hash.
if bar:
            bar += 1
            bar = bar * bar
return bar
else:
            some_string = """
 Indentation in multiline strings should not be touched.
Only actual code should be reindented.
"""
return (sys.path, some_string)

可以看到虽然都是PEP8风格，但是效果还是略有不同，可以根据需要个人习惯进行有选择的使用。