计算代码运行时长

# 计算代码执行的时间
import time
start = time.time()
x = 0
for i in range(1, 100000000):
    x += 1
print(x)
end = time.time()
print('代码运行了{}s'.format(end - start))

>

99999999
代码运行了6.123429298400879s

那么每次运行代码前后都需要这样编写，是非常麻烦的，这个时候就引入装饰器

装饰器的基本使用

```python

-- coding: utf-8 --

@Author: afei

计算代码执行的时间

import time

start = time.time()

def use_time(fn): def inner(x): start = time.time() s = fn(x) end = time.time() print(‘代码运行了{}’.format(end - start)) return s return inner

@use_time def fun1(n): x = 0 for i in range(1,n): x += i return x fun1(12345667)

>>>
```python
代码运行了0.4541590213775635

args和*kwargs

# -*- coding: utf-8 -*-
# @Author: afei
# 计算代码执行的时间
import time
# start = time.time()
def use_time(fn):
    def inner(x,*args,**kwargs):
        start = time.time()
        s = fn(x)
        end = time.time()
        print('代码运行了{}'.format(end - start))
        return s
    return inner
@use_time
def fun1(n):
    x = 0
    for i in range(1,n):
        x += i
    return x
fun1(12345667,'hello',b=1234556)

>

代码运行了0.5189573764801025