两个大数相乘-python实现

def multiply_two_big_number(str1,str2):
    result = [0] * (len(str1) + len(str2))
    t1 = str1[::-1]
    t2 = str2[::-1]
    for i in range(len(t2)):
        for j in range(len(t1)):
            result[j + i] += int(t2[i]) * int(t1[j])
    for k in range(len(result)):
        if result[k] >= 10:
            result[k+1] += result[k] / 10
            result[k] = result[k] % 10
    while result != [] and result[-1] == 0:
        result = result[:-1]
    if result == []: return 0
    return "".join([str(i) for i in result[::-1]])