大整数乘法python3实现

import sys

def list2str(li):
	while li[0]==0:
		del li[0]
	res=''
	for i in li:
		res+=str(i)
	return res

def multi(stra,strb):
	aa=list(stra)
	bb=list(strb)
	lena=len(stra)
	lenb=len(strb)
	result=[0 for i in range(lena+lenb)]
	for i in range(lena):
		for j in range(lenb):
			result[lena-i-1+lenb-j-1]+=int(aa[i])*int(bb[j])
	for i in range(len(result)-1):
		if result[i]>=10:
			result[i+1]+=result[i]//10
			result[i]=result[i]%10
	return list2str(result[::-1])

if __name__=='__main__':
	if len(sys.argv)!=3:
		print('请输入两个参数')
		exit()
	a=sys.argv[1]
	b=sys.argv[2]
	res=multi(a,b)
	print('multi',res)
	print('ok',int(a)*int(b))