计算平均分数在一本字典的字符串

Question

我如何写一个Python程序，与任何字符串的输入和字典的形式取值为字符串在词典：

score("a b" , {"a":(1.2) , "b":(3.4)}) 

，并返回作为浮点数的平均值？

Answer 1

它看起来像你对我想：

def score(key_str,dct): 
    keys = key_str.split() 
    v = sum(dct[key] for key in keys) 
    return float(v)/len(keys) 

Answer 2

这里有一个不那么抽象的答案。

def score(hairypeople, hair_length): 
    """ Calculates the average nosehair length given a string of people's names 
    and a dictionary of the length of their nose hairs. """ 
    list_of_hairy_people = hairypeople.split() 
    number_of_hairy_people = len(list_of_hairy_people) 
    sum_length_of_hairs = sum([hair_length[ew] for ew in list_of_hairy_people]) 
    return float(sum_length_of_hairs)/number_of_hairy_people