Does Evernote's b64dec.py script convert all types (txt, pdf, jpg etc.)

Question

Learning Python, I found Evernote's python script b64dec.py for converting notes described in an .ENEX file back to their native format.

I was unclear how it even worked at first. I could not find a "cat" command for example. (Line 27 in github listing)

# cat base64File | python b64dec.py myfile.ext

I concluded eventually you invoke it with :

<source ENEX file> | python b64dec.py <outputfile.desired_extension >

Is that correct?

I have tried sending a text only note to a .txt file, and an image only note to a .jpg file. They all end up zero length files.

Am I invoking this script correctly. Do I understand its purpose correctly (converts a note with an image back to an image etc.).

#!/usr/bin/env python

# Copyright 2013 Evernote Corporation. All rights reserved.

import base64
import sys

# Copy the base64 string from the ENEX file and put it into a file

# Pipe base64-encoded data to STDIN
data = sys.stdin.read()

# Decode data
try:
    imgraw = base64.b64decode(data)
except TypeError, te:
    print 'TypeError: ', te
    raise SystemExit

# Write it to the file passed as a param
with file(sys.argv[1], 'wb') as outfile:
    outfile.write(imgraw)

## Usage:
## (Change myfile.ext to the desired filename and correct extension)

# cat base64File | python b64dec.py myfile.ext

## or, if you base64 data is in the pasteboard on a Mac:

# pbpaste | python b64dec.py myfile.ext