decode and resave urlencoded files

decode.py

import sys
import urllib

# Read.
with open(sys.argv[1]) as cdr_file:
    cdr_data = cdr_file.read()

# Decode.
decoded_data = urllib.unquote(cdr_data).decode('utf8')
print decoded_data

# Write.
new_filename = '%s.decoded' % sys.argv[1]
with open(new_filename, 'w') as decoded_file:
    decoded_file.write(decoded_data)