python中如何比较两个列表不同

#-*- 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)