How do I split one file into two files using Python? [closed]

Answer 1

This approach is similar to Lev's but uses itertools because it's fun.

 dont_break = lambda l: l.strip() != 'string_pattern'

 with open('input') as source:
     with open('out_1', 'w') as out1:
         out1.writelines(itertools.takewhile(dont_break, source))
     with open('out_2', 'w') as out2:
         out2.writelines(source)

You could replace the dont_break function with a regular expression or anything else if necessary.