cProfile and profile don't work with pygtk/pyqt and sys.exit(0)

[akkana]

BPO	5978
Nosy	@amauryfa, @tiran, @akkana, @zooba, @andresdelfino, @miss-islington
PRs	bpo-5978: Document that profiling needs cmd/function to return #7938 [3.7] bpo-5978: Document that profiling needs cmd/function to return (GH-7938) #8512 [3.6] bpo-5978: Document that profiling needs cmd/function to return … #8515
Files	pywin: Small pygtk demo showing the problem

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2018-07-28.12:26:51.097>
created_at = <Date 2009-05-09.18:57:26.738>
labels = ['easy', '3.8', 'type-feature', '3.7', 'docs']
title = "cProfile and profile don't work with pygtk/pyqt and sys.exit(0)"
updated_at = <Date 2018-07-28.12:26:51.096>
user = 'https://github.com/akkana'

bugs.python.org fields:

activity = <Date 2018-07-28.12:26:51.096>
actor = 'steve.dower'
assignee = 'docs@python'
closed = True
closed_date = <Date 2018-07-28.12:26:51.097>
closer = 'steve.dower'
components = ['Documentation']
creation = <Date 2009-05-09.18:57:26.738>
creator = 'akkana'
dependencies = []
files = ['13943']
hgrepos = []
issue_num = 5978
keywords = ['patch', 'easy']
message_count = 6.0
messages = ['87504', '109892', '111173', '322535', '322546', '322547']
nosy_count = 7.0
nosy_names = ['amaury.forgeotdarc', 'christian.heimes', 'akkana', 'docs@python', 'steve.dower', 'adelfino', 'miss-islington']
pr_nums = ['7938', '8512', '8515']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue5978'
versions = ['Python 2.7', 'Python 3.6', 'Python 3.7', 'Python 3.8']

[akkana]

I was following the steps at http://docs.python.org/library/profile.html
to try to profile a pygtk program, but it wasn't working -- I was
getting no output at all from either cProfile or profile.

The problem turned out to be that I was exiting by calling sys.exit(0),
because that's what most pygtk programs I'd seen were doing. Changing
that to gtk.main_quit() made profiling work (but it took a long time to
track that down).

Apparently the same thing happens in pyqt if you call sys.exit(0).

[BreamoreBoy]

I'm note sure if this is a library bug, doc bug, external library issue or what, anyone got any true idea?

[amauryfa]

Profiling only works on functions that actually return; maybe we could
add something about this fact in the documentation

[tiran]

New changeset 937fb55 by Christian Heimes (Andrés Delfino) in branch 'master':
bpo-5978: Document that profiling needs cmd/function to return (GH-7938)
937fb55

[miss-islington]

New changeset c6801b4 by Miss Islington (bot) in branch '3.7':
bpo-5978: Document that profiling needs cmd/function to return (GH-7938)
c6801b4

[zooba]

New changeset 0041d72 by Steve Dower (Andrés Delfino) in branch '3.6':
[3.6] bpo-5978: Document that profiling needs cmd/function to return (GH-8515)
0041d72