I got it. I was comparing '345' to '345\n'
Adding the '\n' to the slice did indeed do the trick.
#!/usr/bin/env python
import string
def main():
infile = open("filex")
outfile = open("results_testx", "w")
zips = open("zippys", "r")
match_zips = zips.readlines()
lines = [line for line in infile if (line[0:3] + '\n') in
match_zips]
outfile.write(''.join(lines))
# print lines[0:2]
zips.close()
infile.close()
outfile.close()
main()
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