If white space is not counted...

# Encodes a python file as white space

import sys

if len(sys.argv) < 2:
    print('Usage: %s <python-file>' % sys.argv[0])
    exit(1)

filename = sys.argv[1]
original_code = open(filename).read()

code = "exec(''.join(chr(len(x)) for x in '"
code += ' '.join('\t'*ord(x) for x in original_code)
code += "'.split(' ')))"

print(code)