STINNER Victor <vstin...@redhat.com> added the comment:
Example:
---
import warnings
import tracemalloc
#tracemalloc.start(5)
# always log ResourceWarning messages
warnings.simplefilter("always", ResourceWarning)
def func():
f = open(__file__)
# emit ResourceWarning
f = None
func()
---
Output with Python 3.7:
---
$ python3 script.py
script.py:11: ResourceWarning: unclosed file <_io.TextIOWrapper
name='script.py' mode='r' encoding='UTF-8'>
f = None
---
Output with my attached PR 10486:
---
$ python3 script.py
script.py:11: ResourceWarning: unclosed file <_io.TextIOWrapper
name='script.py' mode='r' encoding='UTF-8'>
f = None
ResourceWarning: Enable tracemalloc to get the object allocation traceback
---
Finally, if tracemalloc is enabled:
---
$ ./python -X tracemalloc=5 script.py
script.py:11: ResourceWarning: unclosed file <_io.TextIOWrapper
name='script.py' mode='r' encoding='UTF-8'>
f = None
Object allocated at (most recent call last):
File "script.py", lineno 12
func()
File "script.py", lineno 9
f = open(__file__)
---
----------
resolution: not a bug ->
_______________________________________
Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue29564>
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