[Biopython] Entrez EFetch Options

[Zach Gayk]

Hello,

I would like to use the following code from the biopython tutorial to
retrieve gi numbers for a number of sequences that matched to scaffolds on
a genome assembly:

import os
os.chdir('/Users/zachgayk/Desktop/GAVIABioinformatics/')
from Bio import Entrez # this is the most likely script modified
from Bio import SeqIO
Entrez.email = "zgayk at nmu.edu"
handle = Entrez.efetch(db="nucleotide", rettype="gb", retmode="text", \
                       id="gi|50254217|gb|`, gi|50254217|gb|AY567890.1|,
gi|559028|gb|L33375.1|GVSMTDGI,
gi|559028|gb|L33375.1|GVSMTDGI")
for seq_record in SeqIO.parse(handle, "gb"):
    print seq_record.description[:100] + "..." # the :100 specifies no.
characters and "..." says this comes after specified character limit
handle.close()

The problem, however, is that there are a large number of gi numbers I
wish to retrieve, and so there are simply too many to manually enter into
the id ="" field. What I would like to do is specify a file containing all
of the needed gi numbers in a list and then have the code parse all of
them. I haven't been able to figure out how to do this yet, and if anyone
has any ideas they would be very much appreciated.

Thank you,
Zach Gayk