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cProfile.Profile: timer=None signature differs from explicit None behavior #161233
Description
Bug report
cProfile.Profile shows timer=None in its signature, but explicitly passing None causes unraisable TypeErrors while omitting it works.
Reproduced with CPython 3.15.0 and 3.15.2 on Linux x86_64 using python3.15 -I -S repro.py:
import cProfile
import inspect
import sys
print(inspect.signature(cProfile.Profile))
errors = []
sys.unraisablehook = lambda event: errors.append(event.exc_value)
def work():
pass
for kwargs in ({}, {'timer': None}):
errors.clear()
profiler = cProfile.Profile(**kwargs)
profiler.enable()
work()
profiler.disable()
if errors:
exc = errors[0]
print(f'explicit None: {type(exc).__name__}: {exc}')
else:
print('omitted timer: OK')Output on both versions:
(timer=None, timeunit=0.0, subcalls=True, builtins=True)
omitted timer: OK
explicit None: TypeError: 'NoneType' object is not callable
CPython versions tested on:
3.15
Operating systems tested on:
Linux
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youknowone commentedon Nov 3, 2026
similar to #161229
gh-161233: Fix `TypeError` when `timer=None` was passed to `cProfile.…
[3.15] gh-161233: Fix `TypeError` when `timer=None` was passed to `cP…
[3.14] gh-161233: Fix `TypeError` when `timer=None` was passed to `cP…