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bpo-5001: More-informative multiprocessing error messages (#3079)

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* Make error message more informative

Replace assertions in error-reporting code with more-informative version that doesn't cause confusion over where and what the error is.

* Additional clarification + get travis to check

* Change from SystemError to TypeError

As suggested in PR comment by @pitrou, changing from SystemError; TypeError appears appropriate.

* NEWS file installation; ACKS addition (will do my best to justify it by additional work)

* Making current AssertionErrors in multiprocessing more informative

* Blurb added re multiprocessing managers.py, queues.py cleanup

* Further multiprocessing cleanup - went through pool.py

* Fix two asserts in multiprocessing/util.py

* Most asserts in multiprocessing more informative

* Didn't save right version

* Further work on multiprocessing error messages

* Correct typo

* Correct typo v2

* Blasted colon... serves me right for trying to work on two things at once

* Simplify NEWS entry

* Update 2017-08-18-17-16-38.bpo-5001.gwnthq.rst

* Update 2017-08-18-17-16-38.bpo-5001.gwnthq.rst

OK, never mind.

* Corrected (thanks to pitrou) error messages for notify

* Remove extraneous backslash in docstring.
This commit is contained in:
Allen W. Smith, Ph.D 2017-08-29 17:52:18 -05:00 • committed by Antoine Pitrou
parent 631fdee6e6
commit bd73e72b4a
15 changed files with 120 additions and 39 deletions
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2
Lib/multiprocessing/spawn.py
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@ -93,7 +93,7 @@ def spawn_main(pipe_handle, parent_pid=None, tracker_fd=None):
'''
Run code specified by data received over pipe
'''
assert is_forking(sys.argv)
assert is_forking(sys.argv), "Not forking"
if sys.platform == 'win32':
import msvcrt
new_handle = reduction.steal_handle(parent_pid, pipe_handle)