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  • Please edit your code directly into the question. Commented May 9, 2017 at 13:45
  • Please add the code to your question and indent it by four spaces to preserve formatting; comments are not suitable for this, especially for a whitespace-dependent language like Python :) Commented May 9, 2017 at 13:45
  • Does the resultant file need to have any particular order? In your example, your two source files are sorted--is that to be assumed? May all three files be in memory at the same time (so the files are not very large)? Commented May 9, 2017 at 13:53
  • No need to in order format @ Rory Daulton Commented May 9, 2017 at 13:54