How do I set permissions (attributes) on a file in a ZIP file using Python's zipfile module?

Question

When I extract files from a ZIP file created with the Python zipfile module, all the files are not writable, read only etc.

The file is being created and extracted u

Answer 1

You can extend the ZipFile class to change the default file permission:

from zipfile import ZipFile, ZipInfo
import time

class PermissiveZipFile(ZipFile):
    def writestr(self, zinfo_or_arcname, data, compress_type=None):
        if not isinstance(zinfo_or_arcname, ZipInfo):
            zinfo = ZipInfo(filename=zinfo_or_arcname,
                            date_time=time.localtime(time.time())[:6])

            zinfo.compress_type = self.compression
            if zinfo.filename[-1] == '/':
                zinfo.external_attr = 0o40775 << 16   # drwxrwxr-x
                zinfo.external_attr |= 0x10           # MS-DOS directory flag
            else:
                zinfo.external_attr = 0o664 << 16     # ?rw-rw-r--
        else:
            zinfo = zinfo_or_arcname

        super(PermissiveZipFile, self).writestr(zinfo, data, compress_type)

This example changes the default file permission to 664 and keeps 775 for directories.

Related code:

• ZipFile.writestr, Python 2.7
• ZipFile.writestr, Python 3.6