linkt threading.settrace to sys.settrace

[stefanhoelzl]

BPO	36928
Nosy	@matrixise, @stefanhoelzl
PRs	bpo-36928: link threading.settrace to sys.settrace #13345 [3.7] bpo-36928: Doc: Add link threading.settrace to sys.settrace (GH-13345) #13380

^{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 2019-05-17.09:04:20.213>
created_at = <Date 2019-05-15.18:11:23.650>
labels = ['3.8', 'type-bug', '3.7', 'docs']
title = 'linkt threading.settrace to sys.settrace'
updated_at = <Date 2019-05-17.09:05:15.562>
user = 'https://github.com/stefanhoelzl'

bugs.python.org fields:

activity = <Date 2019-05-17.09:05:15.562>
actor = 'matrixise'
assignee = 'docs@python'
closed = True
closed_date = <Date 2019-05-17.09:04:20.213>
closer = 'SilentGhost'
components = ['Documentation']
creation = <Date 2019-05-15.18:11:23.650>
creator = 'stefanhoelzl'
dependencies = []
files = []
hgrepos = []
issue_num = 36928
keywords = ['patch']
message_count = 3.0
messages = ['342591', '342592', '342695']
nosy_count = 4.0
nosy_names = ['SilentGhost', 'docs@python', 'matrixise', 'stefanhoelzl']
pr_nums = ['13345', '13380']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue36928'
versions = ['Python 3.7', 'Python 3.8']

[stefanhoelzl]

The documentation of sys.settrace suggest to call it from every created thread
to enable tracing within threads.

I would suggest to add a link to threading.settrace which automatically sets a trace function for every by threading module created thread.

link to docs:
https://docs.python.org/3.5/library/sys.html#sys.settrace
https://docs.python.org/3.5/library/threading.html#threading.settrace

[SilentGhost]

Would you care to submit a PR implementing this fix? There are some guidelines available at https://devguide.python.org/pullrequest/

[matrixise]

Thank you for your contribution