Performance issue in unzipping files using Python

Question

I'm using this code for unzipping zipped password protected files:

with zipfile.ZipFile(folder_name+'\\'+each+'\\'+latest, "r") as z:
        z.extractall(folder_name+'\\'+each+'\\'+each,pwd=passwd)

This functionally works perfect, but is very slow. Is there any way to make unzipping fast?

@IgnacioVazquez-Abrams Sir it is running on remote system whose hardware is not under my control. — fhulprogrammer, Mar 05 '15 at 20:52
How does it compare to using the zip utility from the command line? The numbers should be similar and that would suggest that you are I/O bound. — tdelaney, Mar 05 '15 at 21:30
Related: https://stackoverflow.com/questions/4997910/python-unzip-tremendously-slow, https://stackoverflow.com/questions/61930445/fast-zip-decryption-in-python — Albert, Aug 24 '23 at 20:43

score 5 · Answer 1 · answered Oct 27 '16 at 09:23

5

From the Python zipfile docs:

It supports decryption of encrypted files in ZIP archives, but it currently cannot create an encrypted file. Decryption is extremely slow as it is implemented in native Python rather than C.

To speed up password protected unzipping - you should probably shell out to a separate utility.

answered Oct 27 '16 at 09:23

markm

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For the record: the decompression is still done in C code; only metadata handling and decryption are done in Python code, and it is the decryption that is slow. – Martijn Pieters Aug 21 '17 at 08:56

Performance issue in unzipping files using Python

1 Answers1