一个python的计算熵(entropy)的函数

# -*- coding: utf-8 -*-
import math

#the function to calculate entropy, you should use the probabilities as the parameters
def entropy(*c):
    result=-1;
    if(len(c)>0):
        result=0;
    for x in c:
        result+=(-x)*math.log(x,2)
    return result;
    
if (__name__=="__main__"):
    print(entropy(1/3,2/3));