You should probably look into Biopython:
http://biopython.org/wiki/Main_Page
Your question should involve fairly straightforward use of the Seq methods
of Biopython. You should not try to write your own FASTA parser: Biopython
comes with a good one already.
Note that the tutor mailing list is not entirely general: the questions
here are expected to be beginner-level. Bioinformatics questions are a bit
out of scope for tutor @python.org, since they involve a specialized domain
that our participants here won't probably be very familiar with.
The last times I participated, the Biopython forums were very active. You
should check them out:
http://biopython.org/wiki/Mailing_lists
Good luck!
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