skwerlman · January 4, 2017 05:46
diff --git a/replace.py b/replace.py
 import sys


 def usage():
    sys.stdout.write('usage: replace.py pairing [pairing ...]')
    sys.stdout.write('    a pairing is a char and what to replace it with')
    sys.stdout.write('    e.g. replace.py a A would replace all \'a\' with \'A\'')
    sys.exit(1)


 def group2(l):
    return zip(*[iter(l)]*2)


 if len(sys.argv) < 2:
    usage()

 args = sys.argv[1:]

 if len(args) % 2 != 0:
    usage()

 reps = {}
 for argA, argB in group2(args):
    reps[argA] = argB

 for line in sys.stdin.readlines():
    chunkbylen = {}
    for pair in reps:
        line = line.replace(pair, reps[pair])
    sys.stdout.write(line)
 sys.exit(0)