python 假设lst=[3,4,12,[6,9,12,24],[12,18,34]]统计list中包含元素12的个数

Question

假设lst=[3,4,12,[6,9,12,24],[12,18,34]]统计list中包含元素12的个数

Answer 1

lst = [3, 4, 12, [6, 9, 12, 24], [12, 18, 34]]


def count(ls):
    c = 0
    for i in ls:
        if type(i) == int:
            if i == 12:
                c += 1
        else:
            c += count(i)
    return c


print(count(lst))