FazBrowse GitHub Viewer | Trending | | Home

Tools: [Download Repo ZIP] [View Raw Code] [Original HTTPS Page]

python/merge_dict.py at master · eatyorcode/python · GitHub

56 lines (43 loc) · 1.14 KB

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

35

36

37

38

39

40

41

42

43

44

45

46

47

48

49

50

51

52

53

54

55

56

# coding=utf-8

__author__ = 'zhanghe'

from tools import time_log

a = {1: 1, 2: 2}

b = {1: 2, 3: 3}

# way 1

@time_log.time_log

def test_1():

print dict(a.items() + b.items())

# way 2

@time_log.time_log

def test_2():

print dict(a, **b)

# way 3

@time_log.time_log

def test_3():

c = a.copy()

c.update(b)

print c

if __name__ == '__main__':

"""

字典合并的几种方式效率测试

因时间太短，将测试时间调整到小数后6位

"""

test_1()

test_2()

test_3()

# 测试结果

# 方法test_1开始时间：Tue May 5 17:56:38 2015

# {1: 2, 2: 2, 3: 3}

# 方法test_1结束时间：Tue May 5 17:56:38 2015

# 方法test_1运行时间：0.000039S

# 方法test_2开始时间：Tue May 5 17:56:38 2015

# {1: 2, 2: 2, 3: 3}

# 方法test_2结束时间：Tue May 5 17:56:38 2015

# 方法test_2运行时间：0.000009S

# 方法test_3开始时间：Tue May 5 17:56:38 2015

# {1: 2, 2: 2, 3: 3}

# 方法test_3结束时间：Tue May 5 17:56:38 2015

# 方法test_3运行时间：0.000009S

# 结论：

# 一、当KEY重复，后面的VALUE会覆盖前面

# 二、后两种方案效率较高，推荐第二种方案

Back | FazBrowse Home | New Git URL