Before:
  runtime ale_linters/python/pylint.vim

After:
  call ale#linter#Reset()
  silent file something_else.py

Execute(pylint handler parsing, translating columns to 1-based index):
  AssertEqual
  \ [
  \   {
  \     'lnum': 4,
  \     'col': 1,
  \     'text': 'C0303: Trailing whitespace (trailing-whitespace)',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 1,
  \     'col': 1,
  \     'text': 'C0111: Missing module docstring (missing-docstring)',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 2,
  \     'col': 1,
  \     'text': 'C0111: Missing function docstring (missing-docstring)',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 3,
  \     'col': 5,
  \     'text': 'E0103: ''break'' not properly in loop (not-in-loop)',
  \     'type': 'E',
  \   },
  \   {
  \     'lnum': 4,
  \     'col': 5,
  \     'text': 'W0101: Unreachable code (unreachable)',
  \     'type': 'W',
  \   },
  \   {
  \     'lnum': 7,
  \     'col': 33,
  \     'text': 'W0702: No exception type(s) specified (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)',
  \ ])