Regex help for newbie

[scidam]

You need to add from __future__ import print_function and pass file keyword to the print function, e.g. print(x, file=y) or use y.write('{}\n'.format(x)). This should work, but not tested.
Why did you still using Python 2.x? If you have digits after car of truck words, it would be better to use a regexp something like this re.compile("car\d+").