In python, how can I see where an object that is about to be garbage collected is originating from?

Asked Jan 03 '20 at 18:00

Active Jan 03 '20 at 18:19

Viewed 108 times

Somewhere in my program, I get a ResourceWarning saying that a file handle has been deleted that did not call close(). However, I am in a giant project and cannot easily find the file handle.

How can I use the gc library to log the name of the file handle's file, or the name of the file in which I create the file handle?

Btw, I am sure the problem has to do with garbage collection, because if I prefix my script with gc.disable(), I don't see the warning.

Update: I only see the Warning log when I run from the context of unittest.main().

edited Jan 03 '20 at 18:19

asked Jan 03 '20 at 18:00

Jonathan Allen Grant

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The warning should include the file name; how exactly are you receiving the warning? – chepner Jan 03 '20 at 18:14
The filename its including looks like the filename of where&when the gc is being used. There are no open file descriptors in the file it references – Jonathan Allen Grant Jan 03 '20 at 18:20
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You aren't getting something like `ResourceWarning: unclosed file <_io.TextIOWrapper name='xxxxxxxx' mode='r' encoding='UTF-8'>`? That's what I get with `f = open("xxxxxxxx"); del f`. – chepner Jan 03 '20 at 18:28
Turns out I just did not recognize the filename – Jonathan Allen Grant Jan 03 '20 at 20:04

In python, how can I see where an object that is about to be garbage collected is originating from?

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