Bad magic number error with ZipFile module in Python

Question

I am using Python 2.7 on Windows 7 (64 bit). When I try to unzip a zip file with ZipFile module I get the following error:-

Traceback (most recent call last)         


        

Answer 1

Make sure you are really opening a ZIP file, not for example a RAR file named with a .zip extension. Proper zip files have a header, which was not found in this case.

The zipfile module can only open zip files. WinRAR can also open other formats, and it likely ignores the filename and only looks at the file itself.

Answer 2

Correct ZIP files always have "\x50\x4B\x03\x04" in the beginning. You can test whether file is really ZIP file with this code:

with open('/path/to/file', 'rb') as MyZip:
  print(MyZip.read(4))

It will print header of file so you can check.

UPDATE Strange, testzip() and all other functions work good. Had you tried such code?

with zipfile.GzipFile('/path/to/file') as Zip:
  for ZipMember in Zip.infolist():
    Zip.extract(ZipMember, path='/dir/where/to/extract', pwd='your-password')