[Tutor] Phyton script for fasta file (seek help)

[Danny Yoo]

Side note: I would strongly suggest using the biopython libraries for
the basic parsing.  FASTA parsing has been done and replicated so many
times that it's almost a hazing ritual for the practicing
bioinformatician.  The biopython folks have written a parser, so
perhaps you can reuse it.

    http://biopython.org/wiki/Main_Page
    http://biopython.org/DIST/docs/tutorial/Tutorial.html#htoc11


About reading from either standard input or as command line arguments,
see the 'fileinput' library:

    http://docs.python.org/3/library/fileinput.html

It automatically handles reading either from sys.stdin, or by opening
up the name of the file passed as a command line argument.