python中如何比较两个列表不同 返回不同值

#-- coding:utf-8 --

import time

#方法1:

def getDiff1(arr1,arr2):

start_time = time.time()

print('1_start:',start_time)

arr_more1 = []

arr_more2 = []

dic_result = {}



for str_1 in arr1:

    dic_result[str(str_1)] = 1



for str_2 in arr2:

    if dic_result.get(str(str_2)):

        dic_result[str(str_2)] = 2

    else:

        arr_more2.append(str_2)



for key,val in dic_result.items():

    if val == 1:

        arr_more1.append(key)



print('arr1比arr2多的内容为:',len(arr_more1))

print('arr2比arr1多的内容为:',len(arr_more2))



end_time = time.time()

print('1_end:',end_time)

print('方法1_比对用时为',end_time-start_time)

#方法2:使用集合运算:

def getDiff2(arr1,arr2):

start_time = time.time()

print('2_start:',start_time)

set_1 = ()

set_2 = ()



#将列表转换为集合set()

set_1 = set(arr1)

set_2 = set(arr2)



set_more1 = ()

set_more2 = ()



#集合运算

set_1_2 = set_1 & set_2

set_more1 = set_1 -set_1_2

set_more2 = set_2 -set_1_2



print('arr1比arr2多的内容为:',len(set_more1))

print('arr2比arr1多的内容为:',len(set_more2))



end_time = time.time()

print('2_end:',end_time)

print('方法2_比对用时为',end_time-start_time)

#测试

初始化500w条数据数据

arr1 = []

arr2 = []

i = 0

while(True):

arr1.append(i * 2)

arr2.append(i * 3)

i += 1

if i > 5000000:

    break

print(‘arr1的长度为:’,len(arr1))

print(‘arr2的长度为:’,len(arr2))

print(‘+’*30)

getDiff1(arr1,arr2)

print(‘-’*30)

getDiff2(arr1,arr2)