Hide high entropy strings

entropy.py

#!/usr/bin/python -u
import math
import sys


def entropy(string):
    prob = [float(string.count(c)) / len(string) for c in dict.fromkeys(list(string))]
    return - sum([p * math.log(p) / math.log(2.0) for p in prob])


for l in sys.stdin.readlines():
    for a in l.split():
        if entropy(a) > 4.4:
            print('*')
        else:
            sys.stdout.write(a)
        sys.stdout.write(' ')
    sys.stdout.write('\n')
    sys.stdout.flush()