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使うライブラリ

pycodestyle

Features
Plugin architecture: Adding new checks is easy.
Parseable output: Jump to error location in your editor.
Small: Just one Python file, requires only stdlib. You can use just the pycodestyle.py file for this purpose.
Comes with a comprehensive test suite.

flake8

Flake8 is a wrapper around these tools:
PyFlakes
pycodestyle
Ned Batchelder’s McCabe script

pylint

Pylint is a Python static code analysis tool which looks for programming errors, helps enforcing a coding standard, sniffs for code smells and offers simple refactoring

チェックするコード

qiita.py

import pycodestyle
import flake8
import pylint


import os
x = {"adfasd"       , 'adsfasdfasd'}
y         =1

pycodestyle

NEW1.py:6:20: E203 whitespace before ','
NEW1.py:7:2: E221 multiple spaces before operator
NEW1.py:7:12: E225 missing whitespace around operator
NEW1.py:8:1: W391 blank line at end of file

flake8

NEW1.py:1:1: F401 'pycodestyle' imported but unused
NEW1.py:2:1: F401 'flake8' imported but unused
NEW1.py:3:1: F401 'pylint' imported but unused
NEW1.py:5:1: F401 'os' imported but unused
NEW1.py:6:20: E203 whitespace before ','
NEW1.py:7:2: E221 multiple spaces before operator
NEW1.py:7:12: E225 missing whitespace around operator
NEW1.py:8:1: W391 blank line at end of file

pylint

************* Module newww.NEW1
NEW1.py:6:20: C0326: No space allowed before comma
x = {"adfasd"       , 'adsfasdfasd'}
                    ^ (bad-whitespace)
NEW1.py:7:10: C0326: Exactly one space required around assignment
y         =1
          ^ (bad-whitespace)
NEW1.py:8:0: C0305: Trailing newlines (trailing-newlines)
NEW1.py:1:0: C0103: Module name "NEW1" doesn't conform to snake_case naming style (invalid-name)
NEW1.py:1:0: C0114: Missing module docstring (missing-module-docstring)
NEW1.py:6:0: C0103: Constant name "x" doesn't conform to UPPER_CASE naming style (invalid-name)
NEW1.py:7:0: C0103: Constant name "y" doesn't conform to UPPER_CASE naming style (invalid-name)
NEW1.py:1:0: W0611: Unused import pycodestyle (unused-import)
NEW1.py:2:0: W0611: Unused import flake8 (unused-import)
NEW1.py:3:0: W0611: Unused import pylint (unused-import)
NEW1.py:5:0: W0611: Unused import os (unused-import)
NEW1.py:5:0: C0411: standard import "import os" should be placed before "import pycodestyle" (wrong-import-order)

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まとめ

厳しさ
pylint > flake8 > pycodestyle