from Bio import SeqIO
 
input_handle = open("TEST.gb", "rU")
output_handle = open("test2.fasta", "w")
 
sequences = SeqIO.parse(input_handle, "genbank")
count = SeqIO.write(sequences, output_handle, "fasta")
 
output_handle.close()
input_handle.close()
 
print "Converted %i records" % count