两个字符串中的常用字母

时间:2014-02-15 13:31:09

标签: python string

我一直在尝试解决这个程序,该程序将两个字符串作为输入并输出常用字母数。例如,如果输入是“common”和“connor”,则输出应为4(1 c,1 n和2 o)。我使用set()函数但输出3(它将两个o视为单个公共信件 )。任何帮助将不胜感激。谢谢!!!

这是我写的代码:

print("Enter number of inputs: ")
c = int(input())
store = []
for each_item in range(c):
    print("Enter First String: ")
    one = input()
    print("Enter Second String")
    two = input()
    s = len(set(one) & set(two))
    store.append(s)
for each_number in store:
    print(each_number)

2 个答案:

答案 0 :(得分:8)

使用collections.Counter

>>> from collections import Counter

>>> Counter('common')
Counter({'m': 2, 'o': 2, 'c': 1, 'n': 1})
>>> Counter('connor')
Counter({'o': 2, 'n': 2, 'c': 1, 'r': 1})

>>> common = Counter('common') & Counter('connor') # intersection
>>> common
Counter({'o': 2, 'c': 1, 'n': 1})
>>> sum(common.values())
4

答案 1 :(得分:0)

你也可以列出理解

>>> a = 'common'
>>> b = 'connor'
>>> sum([1 for l in a if l in b])
4

修改

a,b = 'come','common'

def collision_count(a,b):
    da = {l:a.count(l) for l in a}
    db = {l:b.count(l) for l in b}
    return sum(min(v,db[k]) for k,v in da.items() if k in db.keys())

print collision_count(a,b)
3

你现在好吗?