STINNER Victor added the comment:
The test was introduced by the change 73afda5a4e4c of the issue ##17911 in
Python 3.6:
---
changeset: 94850:73afda5a4e4c
parent: 94848:fc0201ccbcd4
user: Robert Collins <[email protected]>
date: Thu Mar 05 12:07:57 2015 +1300
files: Doc/library/linecache.rst Doc/library/traceback.rst
Lib/linecache.py Lib/test/test_linecache.py Lib/test/test_traceback.py L
description:
Issue #17911: traceback module overhaul
Provide a way to seed the linecache for a PEP-302 module without actually
loading the code.
Provide a new object API for traceback, including the ability to not lookup
lines at all until the traceback is actually rendered, without any trace of the
original objects being kept alive.
---
I would prefer that Robert reviews the change to make sure that it's correct.
It looks like running Lib/test/test_traceback.py creates a less deeper
callback, the callback has 10 frames whereas the test ensures that we have
*more* than 10 frames. Output of traceback.print_traceback():
---
..........................................
File "Lib/test/test_traceback.py", line 923, in <module>
unittest.main()
File "/home/haypo/prog/python/default/Lib/unittest/main.py", line 94, in
__init__
self.runTests()
File "/home/haypo/prog/python/default/Lib/unittest/main.py", line 255, in
runTests
self.result = testRunner.run(self.test)
File "/home/haypo/prog/python/default/Lib/unittest/runner.py", line 176, in
run
test(result)
File "/home/haypo/prog/python/default/Lib/unittest/suite.py", line 84, in
__call__
return self.run(*args, **kwds)
File "/home/haypo/prog/python/default/Lib/unittest/suite.py", line 122, in run
test(result)
File "/home/haypo/prog/python/default/Lib/unittest/suite.py", line 84, in
__call__
return self.run(*args, **kwds)
File "/home/haypo/prog/python/default/Lib/unittest/suite.py", line 122, in run
test(result)
File "/home/haypo/prog/python/default/Lib/unittest/case.py", line 648, in
__call__
return self.run(*args, **kwds)
File "/home/haypo/prog/python/default/Lib/unittest/case.py", line 600, in run
testMethod()
File "Lib/test/test_traceback.py", line 683, in test_walk_stack
traceback.print_stack()
---
I count 11 frames, but I guess that we should exclude the latest one.
If I understood correctly, we should modify the unit test to check that we have
at least *9* frames instead of 10.
I don't think that it's ok to test the *exact* number of frames, because it's
highly dependent of the implementation of the unittest module. Tomorrow, the
unittest module may be modified to add new calls in the call stacks... or maybe
even remove some calls, but IMHO this is less likely.
---
This issue remembers me a very complex issue related to
sys.setrecursionlimit(), issue #25274. I factored deeply Lib/test/regrtest.py
(which even became a "library", Lib/test/libregrtest/), and with this change, I
added more calls to the call stack. As a consequence, I triggered a new complex
bug in how Python handles RecursionError.
At the end, I modified sys.setrecursionlimit() to raise directly a
RecursionError if the new limit is too low *depending on the depth of the
current call stack* ;-)
----------
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Python tracker <[email protected]>
<http://bugs.python.org/issue25783>
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