Sebastian Berg <[email protected]> added the comment:
Ahh, a further data-point. The name from the module scope that is overwritten
IS a parameter name used in the function locals. Strangly, if I modify the
tracing to print more:
stop = 0
def trace(frame, event, arg):
global stop
if stop > 10:
return None
if np.core.numeric.dtype is not np.dtype:
#print("Something happened here, `np.core.numeric.dtype IS np.dtype`")
print(np.core.numeric.dtype)
print(frame, event, arg)
stop += 1
else:
print(frame, event, arg)
return trace
Then what I get is:
None
<frame at 0x7faa254396c0, file
'/home/sebastian/forks/numpy/build/testenv/lib/python3.10/site-packages/numpy/core/numeric.py',
line 289, code full> call None
None
<frame at 0x7faa254396c0, file
'/home/sebastian/forks/numpy/build/testenv/lib/python3.10/site-packages/numpy/core/numeric.py',
line 337, code full> line None
None
<frame at 0x7faa254396c0, file
'/home/sebastian/forks/numpy/build/testenv/lib/python3.10/site-packages/numpy/core/numeric.py',
line 340, code full> line None
None
<frame at 0x7faa254396c0, file
'/home/sebastian/forks/numpy/build/testenv/lib/python3.10/site-packages/numpy/core/numeric.py',
line 341, code full> line None
None
<frame at 0x7faa254396c0, file
'/home/sebastian/forks/numpy/build/testenv/lib/python3.10/site-packages/numpy/core/numeric.py',
line 342, code full> line None
bool
So, upon entering the function, the value is (already) cleared/set to None
(which is correct of course for `dtype=None`) and then while the function runs
storing into the function locals _mutates_ the module global?
For the fact that it keeps changing during the function run, points very
strongly at CPython?
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<https://bugs.python.org/issue46451>
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