PEP 은 무엇인가?

PEP 8 -- Style Guide for Python Code

Title:Style Guide for Python Code
Author:Guido van Rossum <guido at>, Barry Warsaw <barry at>, Nick Coghlan <ncoghlan at>
Post-History:05-Jul-2001, 01-Aug-2013

PEP8은  Python Enhancement Proposals (PEP) 의 8 번째 내용으로, 더 나은 파이썬 코드를 작성하기 위한 하나의 코딩 규약 (Style Guide for Python Code)입니다. (

Python PEP8 code convention cheat sheet

아래 파이썬 코드는 PEP8 style 을 활용한 코딩 예입니다. 일종의 cheat sheet로 이 코드만 알면 PEP8 에서 지향하는 파이썬 코딩 스타일의 대부분을 알 수 있습니다!

내용을 간단하게 요약하면 아래와 같습니다.

1. 모듈과 패키지 이름은 짧고 lower_case_with_underscore 이다. 

2. 다른 모듈에서 import 할 때 보일 필요가 없는 함수, 변수는 변수명 앞에 _를 추가한다. 

3. 상수는 A_CONSTANT 

4. 함수는 naming_convention

5. 클래스는 NamingConvention

6. 한 라인의 길이가 79 길이가 넘지 않도록 한다. (이것은 대략적인 A4 용지 사이즈이다.)

#! /usr/bin/env python # -*- coding: utf-8 -*- """This module's docstring summary line. This is a multi-line docstring. Paragraphs are separated with blank lines. Lines conform to 79-column limit. Module and packages names should be short, lower_case_with_underscores. Notice that this in not Seriously, use flake8. with is awesome! See for more PEP-8 details """ import os # STD lib imports first import sys # alphabetical import some_third_party_lib # 3rd party stuff next import some_third_party_other_lib # alphabetical import local_stuff # local stuff last import more_local_stuff import dont_import_two, modules_in_one_line # IMPORTANT! from pyflakes_cannot_handle import * # and there are other reasons it should be avoided # noqa # Using # noqa in the line above avoids flake8 warnings about line length! _a_global_var = 2 # so it won't get imported by 'from foo import *' _b_global_var = 3 A_CONSTANT = 'ugh.' # 2 empty lines between top-level funcs + classes def naming_convention(): """Write docstrings for ALL public classes, funcs and methods.     Functions use snake_case.     """ if x == 4: # x is blue <== USEFUL 1-liner comment (2 spaces before #) x, y = y, x # inverse x and y <== USELESS COMMENT (1 space after #) c = (a + b) * (a - b) # operator spacing should improve readability. dict['key'] = dict[0] = {'x': 2, 'cat': 'not a dog'} class NamingConvention(object): """First line of a docstring is short and next to the quotes.     Class and exception names are CapWords.     Closing quotes are on their own line     """ a = 2 b = 4 _internal_variable = 3 class_ = 'foo' # trailing underscore to avoid conflict with builtin # this will trigger name mangling to further discourage use from outside # this is also very useful if you intend your class to be subclassed, and # the children might also use the same var name for something else; e.g. # for simple variables like 'a' above. Name mangling will ensure that # *your* a and the children's a will not collide. __internal_var = 4 # NEVER use double leading and trailing underscores for your own names __nooooooodontdoit__ = 0 # don't call anything (because some fonts are hard to distiguish): l = 1 O = 2 I = 3 # some examples of how to wrap code to conform to 79-columns limit: def __init__(self, width, height, color='black', emphasis=None, highlight=0): if width == 0 and height == 0 and \ color == 'red' and emphasis == 'strong' or \ highlight > 100: raise ValueError('sorry, you lose') if width == 0 and height == 0 and (color == 'red' or emphasis is None): raise ValueError("I don't think so -- values are %s, %s" % (width, height)) Blob.__init__(self, width, height, color, emphasis, highlight) # empty lines within method to enhance readability; no set rule short_foo_dict = {'loooooooooooooooooooong_element_name': 'cat', 'other_element': 'dog'} long_foo_dict_with_many_elements = { 'foo': 'cat', 'bar': 'dog' } # 1 empty line between in-class def'ns def foo_method(self, x, y=None): """Method and function names are lower_case_with_underscores.         Always use self as first arg.         """ pass @classmethod def bar(cls): """Use cls!""" pass # a 79-char ruler: # 34567891123456789212345678931234567894123456789512345678961234567897123456789 """ Common naming convention names: snake_case MACRO_CASE camelCase CapWords """ # Newline at end of file

출처 -

  • sinho3148 2020.11.17 17:35

    도움되는 글 잘 보고 가요