Python ：將一個字符串轉換成整型、浮點型（map、reduce）

1、將一個字符串轉換成整型（map和reduce）

from functools import reduce

def str2int(s):
    def char2int(ch):
        c = {str(x): x for x in range(10)}
        return c[ch]

    def fun(n1, n2):
        return n1 * 10  + n2

    # [2,4,3,1,2]
    return reduce(fun, map(char2int, s))

num = str2int('24312')
print(type(num), num)

輸出：