STINNER Victor added the comment:
Try attached res_warn.py script to test manually all ResourceWarning warnings.
Ouput of python3.6 -Wd res_warn.py:
--------------------------
text
<_pyio.TextIOWrapper name='/etc/issue' mode='r' encoding='UTF-8'>
res_warn.py:9: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f = None
buffered
<_pyio.BufferedReader name='/etc/issue'>
res_warn.py:15: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
raw
<_pyio.FileIO name='/etc/issue' mode='rb' closefd=True>
res_warn.py:21: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
fileio
<_pyio.FileIO name='/etc/issue' mode='rb' closefd=True>
res_warn.py:27: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
--------------------------
Ouput of python3.6 -X tracemalloc=2 -Wd res_warn.py:
--------------------------
text
<_pyio.TextIOWrapper name='/etc/issue' mode='r' encoding='UTF-8'>
res_warn.py:9: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f = None
Object allocated at (most recent call first):
File "/home/haypo/prog/python/default/Lib/_pyio.py", lineno 209
closefd, opener=opener)
File "res_warn.py", lineno 7
f = _pyio.open(fn, "r")
buffered
<_pyio.BufferedReader name='/etc/issue'>
res_warn.py:15: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
Object allocated at (most recent call first):
File "/home/haypo/prog/python/default/Lib/_pyio.py", lineno 209
closefd, opener=opener)
File "res_warn.py", lineno 13
f = _pyio.open(fn, "rb")
raw
<_pyio.FileIO name='/etc/issue' mode='rb' closefd=True>
res_warn.py:21: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
Object allocated at (most recent call first):
File "/home/haypo/prog/python/default/Lib/_pyio.py", lineno 209
closefd, opener=opener)
File "res_warn.py", lineno 19
f = _pyio.open(fn, "rb", 0)
fileio
<_pyio.FileIO name='/etc/issue' mode='rb' closefd=True>
res_warn.py:27: ResourceWarning: unclosed file <_pyio.FileIO name='/etc/issue'
mode='rb' closefd=True>
f=None
Object allocated at (most recent call first):
File "res_warn.py", lineno 25
f = _pyio.FileIO(fn, "rb")
--------------------------
----------
Added file: http://bugs.python.org/file42274/res_warn.py
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Python tracker <[email protected]>
<http://bugs.python.org/issue19829>
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