In chasing down a bug in my code that only manifests itself when running under cProfile I managed to find the culprit in datetime.timedelta by way of dateutil.

Here is a small repro:

https://gist.github.com/beaugunderson/68ea6424a4fdcf763ccad08e42a74974

I believe an exception should still be raised in broken() when run under cProfile, but for some reason it is not.

Here's a simpler reproduction without involving a third party library:

>>> import cProfile
>>> from datetime import timedelta
>>> pr = cProfile.Profile()
>>> timedelta.total_seconds(-25200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'total_seconds' requires a 'datetime.timedelta' object but received a 'int'
>>> pr.enable()
>>> timedelta.total_seconds(-25200)
2177366085.870893
>>> pr.disable()
>>> timedelta.total_seconds(-25200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'total_seconds' requires a 'datetime.timedelta' object but received a 'int'


However, it appears fixed on master:

$ ./python
Python 3.8.0a0 (heads/master:c984d20ec8, Oct 16 2018, 20:47:49) 
[GCC 7.3.0] on linux
>>> 
>>> import cProfile
>>> from datetime import timedelta
>>> pr = cProfile.Profile()
>>> timedelta.total_seconds(-25200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'total_seconds' requires a 'datetime.timedelta' object but received a 'int'
>>> pr.enable()
>>> timedelta.total_seconds(-25200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'total_seconds' for 'datetime.timedelta' objects doesn't apply to 'int' object
>>> pr.disable()
>>> timedelta.total_seconds(-25200)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: descriptor 'total_seconds' requires a 'datetime.timedelta' object but received a 'int'


Doing a git bisect shows that this commit fixed the issue: https://github.com/python/cpython/pull/8300

Here's the bpo for that: https://bugs.python.org/issue34126

Thanks Anthony for the details. This was fixed in master and back ported to 3.7. The fix is also released with 3.7.1 [0] which I have verified locally. So I propose closing this issue since upgrading to the latest maintenance release fixes this.

[0] https://www.python.org/downloads/release/python-371/

Thanks

This bug is fixed in both 3.8 and 3.7, @p-ganssle what do you think about closing this?