Before: Save g:ale_warn_about_trailing_whitespace let g:ale_warn_about_trailing_whitespace = 1 runtime ale_linters/python/pylint.vim After: Restore call ale#linter#Reset() silent file something_else.py Execute(Basic pylint errors should be handle): AssertEqual \ [ \ { \ 'lnum': 4, \ 'col': 1, \ 'text': 'Trailing whitespace', \ 'code': 'trailing-whitespace', \ 'type': 'W', \ }, \ { \ 'lnum': 1, \ 'col': 1, \ 'text': 'Missing module docstring', \ 'code': 'missing-docstring', \ 'type': 'W', \ }, \ { \ 'lnum': 2, \ 'col': 1, \ 'text': 'Missing function docstring', \ 'code': 'missing-docstring', \ 'type': 'W', \ }, \ { \ 'lnum': 3, \ 'col': 5, \ 'text': '''break'' not properly in loop', \ 'code': 'not-in-loop', \ 'type': 'E', \ }, \ { \ 'lnum': 4, \ 'col': 5, \ 'text': 'Unreachable code', \ 'code': 'unreachable', \ 'type': 'W', \ }, \ { \ 'lnum': 7, \ 'col': 33, \ 'text': 'No exception type(s) specified', \ 'code': 'bare-except', \ 'type': 'W', \ }, \ ], \ ale_linters#python#pylint#Handle(bufnr(''), [ \ 'No config file found, using default configuration', \ '************* Module test', \ 'test.py:4:0: C0303 (trailing-whitespace) Trailing whitespace', \ 'test.py:1:0: C0111 (missing-docstring) Missing module docstring', \ 'test.py:2:0: C0111 (missing-docstring) Missing function docstring', \ 'test.py:3:4: E0103 (not-in-loop) ''break'' not properly in loop', \ 'test.py:4:4: W0101 (unreachable) Unreachable code', \ 'test.py:7:32: W0702 (bare-except) No exception type(s) specified', \ '', \ '------------------------------------------------------------------', \ 'Your code has been rated at 0.00/10 (previous run: 2.50/10, -2.50)', \ ]) Execute(Ignoring trailing whitespace messages should work): let g:ale_warn_about_trailing_whitespace = 0 AssertEqual \ [ \ { \ 'lnum': 1, \ 'col': 1, \ 'text': 'Missing module docstring', \ 'code': 'missing-docstring', \ 'type': 'W', \ }, \ ], \ ale_linters#python#pylint#Handle(bufnr(''), [ \ 'No config file found, using default configuration', \ '************* Module test', \ 'test.py:4:0: C0303 (trailing-whitespace) Trailing whitespace', \ 'test.py:1:0: C0111 (missing-docstring) Missing module docstring', \ '', \ '------------------------------------------------------------------', \ 'Your code has been rated at 0.00/10 (previous run: 2.50/10, -2.50)', \ ]) Execute(The pylint handler should parse Windows filenames): AssertEqual \ [ \ { \ 'lnum': 13, \ 'col': 6, \ 'text': 'Undefined variable ''x''', \ 'code': 'undefined-variable', \ 'type': 'E', \ }, \ ], \ ale_linters#python#pylint#Handle(bufnr(''), [ \ '************* Module test', \ 'D:\acm\github\vim\tools\test.py:13:5: E0602 (undefined-variable) Undefined variable ''x''', \ '', \ '------------------------------------------------------------------', \ 'Your code has been rated at 5.83/10 (previous run: 5.83/10, +0.00)', \ ])