Python の Lint (文法チェッカ) まとめ - flake8 + hacking を使う - ref: http://qiita.com/kitsuyui/items/5ab4608003a29ff7689f

autofalke

$ autoflake -i --remove-all-unused-imports --remove-unused-variables main.py

file10.txt

$ pip search flake8

file11.txt

$ autopep8 -i main.py

file12.txt

main.py:3: local variable 'x' is assigned to but never used

file14.txt

main.py:3: local variable 'x' is assigned to but never used

file16.txt

$ pip install pyformat
$ pip install isort

file7.txt

main.py:3:1: H306  imports not in alphabetical order (sys, os)

file8.txt

$ pip install flake8-pep257

file9.txt

flake8 ⊃ pep8
flake8 ⊃ pyflakes
flake8 + flake8-pep257 ⊃ pep257
flake8 + flake8-import-order ⊃ import-order

flake8

$ flake8 main.py
main.py:2:1: F401 'sys' imported but unused
main.py:3:1: F401 'os' imported but unused
main.py:4:1: E302 expected 2 blank lines, found 0
main.py:5:5: F841 local variable 'x' is assigned to but never used
main.py:9:5: E303 too many blank lines (2)
main.py:10:14: E271 multiple spaces after keyword

hacking

$ flake8 main.py
main.py:2:1: F401 'sys' imported but unused
main.py:3:1: F401 'os' imported but unused
main.py:3:1: H306  imports not in alphabetical order (sys, os)
main.py:4:1: E302 expected 2 blank lines, found 0
main.py:5:5: F841 local variable 'x' is assigned to but never used
main.py:9:5: E303 too many blank lines (2)
main.py:10:14: E271 multiple spaces after keyword

install

$ pip install hacking flake8-import-order flake8-pep257

isort

$ isort -rc main.py 

main.py

import sys  # 余分な import
import os
def fib():
    x = 0  # 使ってない変数
    a, b = 1, 1


    while True:
        yield    a    # 余分なスペース
        a, b = b, a + b


if __name__ == '__main__':
    for i, num in enumerate(fib()):
        print(num)
        if i >= 9:
            break

main.py(autopep8後)

import sys
import os


def fib():
    x = 0  # 使ってない変数
    a, b = 1, 1

    while True:
        yield a    # 余分なスペース
        a, b = b, a + b


if __name__ == '__main__':
    for i, num in enumerate(fib()):
        print(num)
        if i >= 9:
            break

pep8

$ pep8 main.py
main.py:4:1: E302 expected 2 blank lines, found 0
main.py:9:5: E303 too many blank lines (2)
main.py:10:14: E271 multiple spaces after keyword

pyflakes

$ pyflakes main.py
main.py:2: 'sys' imported but unused
main.py:3: 'os' imported but unused
main.py:5: local variable 'x' is assigned to but never used

使い方

$ flake8 [対象]