Faster count uniq cut file (for flake8 or log for instance) (Thx @boblefrag for http://snippet.gabory.fr/snippet/9/)

cutfdu.py

# From http://snippet.gabory.fr/snippet/9/
# Similar to `cut -d ":" -f 1 | sort | uniq -c | sort -n`
#
# Usage: flake8 venv | python cutfdu.py
# Mock : flake8 venv | cut -d ":" -f 1 | sort | uniq -c | sort -n
#
# From Natim with love (2014-02-14)

import itertools
import sys

print "\n".join([" %s\t%s" % (elem[1], elem[0]) for elem in sorted(
    [(test[0], len(
                [a for a in test[1]]
                )
      ) for test in itertools.groupby(
            sorted(
                [
                    line.split(":")[0] for line in
                    sys.stdin.readlines()
                    ]
                ),
            lambda x: x)
     ],
    lambda a, b: a[1] - b[1]
    )])