python Autopep8 realizes automatic typesetting of Python code according to PEP8 style

Autopep8 is a gadget that automatically typesets Python code into PEP8 style. It uses pep8 tools to decide which parts of the code need to be typeset. Autopep8 fixes most of the typesetting problems reported in the pep8 tool.

Reference website:

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

https://pypi.python.org/pypi/autopep8/

(1) The installation steps are as follows:

localhost:~ a6$ sudo pip install autopep8
Password:
The directory '/Users/a6/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/a6/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting autopep8
Collecting pycodestyle>=2.3 (from autopep8)
 Downloading pycodestyle-2.3.1-py2.py3-none-any.whl (45kB)
  100% | In fact, in fact, the | 51kB 324kB/s
Installing collected packages: pycodestyle, autopep8
Successfully installed autopep8-1.3.3 pycodestyle-2.3.1
localhost:~ a6$ sudo pip install autopep8
The directory '/Users/a6/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/a6/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Requirement already satisfied: autopep8 in /Library/Python/2.7/site-packages
Requirement already satisfied: pycodestyle>=2.3 in /Library/Python/2.7/site-packages (from autopep8)

(2) Sample code:

1) Typesetting of code before running the command (saved in test_autopep8.py)

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)

2) Run the command

bogon:AB a6$ autopep8 --in-place --aggressive --aggressive test_autopep8.py

3) Typesetting the code after running the command

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)

4) Reference website:
https://github.com/hhatto/autopep8