FastaIterator(handle,
alphabet=SingleLetterAlphabet(),
title2ids=None)
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Generator function to iterate over Fasta records (as SeqRecord objects).
handle - input file
alphabet - optional alphabet
title2ids - A function that, when given the title of the FASTA
file (without the beginning >), will return the id, name and
description (in that order) for the record as a tuple of strings.
If this is not given, then the entire title line will be used
as the description, and the first word as the id and name.
Note that use of title2ids matches that of Bio.Fasta.SequenceParser
but the defaults are slightly different.
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