only small letters

onlysmall.py

#!/usr/bin/env python3.4

from itertools import filterfalse

from sys import argv

try:
	filepath = argv[1]
except IndexError:
	raise SystemExit('must specify path to file')

with open(filepath) as myfile:
	corpus = myfile.read().splitlines()

only_small = filterfalse(lambda x: x[0].isupper(), corpus)


with open('result.txt', 'w') as newfile:
	newfile.write('\n'.join(only_small))

print('over and out')