[issue33557] Windows multiprocessing doesn't propagate tabcheck to children

[Inada Naoki]

Inada Naoki  added the comment:

Python 2.7 became EOL.

--
nosy: +methane
resolution:  -> out of date
stage:  -> resolved
status: open -> closed

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[issue33557] Windows multiprocessing doesn't propagate tabcheck to children

[Jakub Wilk]

New submission from Jakub Wilk :

Multiprocessing on Windows is supposed to start child processes using
the same sys.flags as the current process (see issue 12098).
However, at least sys.flags.tabcheck is not propagated.

I've attached small test program that reproduces this bug.
On Linux, as expected, it fails with TabError if you use -tt:

  $ python -tt test-tabcheck.py 
  Process Process-1:
  Traceback (most recent call last):
File "/usr/lib/python2.7/multiprocessing/process.py", line 267, in 
_bootstrap
  self.run()
File "/usr/lib/python2.7/multiprocessing/process.py", line 114, in run
  self._target(*self._args, **self._kwargs)
File "test-tabcheck.py", line 6, in test_ast_parse
  ast.parse('if 1:\n\t1\n' + '\x20' * 8 +'1')
File "/usr/lib/python2.7/ast.py", line 37, in parse
  return compile(source, filename, mode, PyCF_ONLY_AST)
File "", line 3
  1
  ^
  TabError: inconsistent use of tabs and spaces in indentation

But it doesn't on Windows:

  >python -tt test-tabcheck.py
  Process Process-1:
  Traceback (most recent call last):
File "C:\Python27\lib\multiprocessing\process.py", line 267, in _bootstrap
  self.run()
File "C:\Python27\lib\multiprocessing\process.py", line 114, in run
  self._target(*self._args, **self._kwargs)
File "...\test-tabcheck.py", line 7, in test_ast_parse
  assert sys.flags.tabcheck == expected_tabcheck, 'sys.flags.tabcheck == 
{0} != {1}'.format(sys.flags.tabcheck, expected_tabcheck)
  AssertionError: sys.flags.tabcheck == 0 != 2

This was tested with Python 2.7.15.

--
components: Library (Lib), Windows
files: test-tabcheck.py
messages: 316949
nosy: jwilk, paul.moore, steve.dower, tim.golden, zach.ware
priority: normal
severity: normal
status: open
title: Windows multiprocessing doesn't propagate tabcheck to children
versions: Python 2.7
Added file: https://bugs.python.org/file47598/test-tabcheck.py

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