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]])