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Asked: 2026-06-15T01:10:05+00:00

I am using Python, but recently I am running a lot into the memory

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I am using Python, but recently I am running a lot into the memory errors.

One is related to saving the plots in .png format. As soon as I try to save them in .pdf format I don’t have this problem anymore. How can I still use .png for multiple files?

Secondly I am reading quite big data files, and after a while, I run out of memory. I try closing them each time but perhaps there is still something opened left. Is there a way to close all the the opened files in Python without having handlers to them?

And finally, Python should release all the unused variables, but I think it’s not doing so. If I run just one function I have no problem, but if I run two unrelated functions in the row (after finishing the first and before going to the second, in my understanding, all the variables should be released), during the second one, I run yet again into the memory error problem. Therefore I believe, the variables are not released after the first run. How can I force Python to release all of them (I don’t want to use del, because there are loads of variables and I don’t want to specify every single one of them).

Thanks for your help!

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1 Answer

  1. Editorial Team

    Secondly I am reading quite big data files, and after a while, I run out of memory. I try closing them each time but perhaps there is still something opened left. Is there a way to close all the the opened files in Python without having handlers to them?

    If you use with open(myfile1) as f1: ..., you don’t need to worry about closing files or about accidentally leaving files opened.

    See here for a good explanation.

    As for the other questions, I agree with alex_jordan that it would help if you showed some of your code.

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