Generate a histogram from standard input.

histo-stdin.py

#!/usr/bin/python

import sys

dict = {}
#f = open (sys.argv[1])
for line in sys.stdin:
    line = line.strip()
    if line in dict:
        dict[line] += 1
    else:
        dict[line] = 1

for (a,b) in dict.items():
    print "%i %s" % (b, a)