1. Decorator function:
Enhance the function of the function without modifying the original function
2. Function without parameters + decorator without parameters
(1) The decorated function of foo()
(2) show_time() is a decorator
# -*- coding:utf-8 -*-
import time
def show_time(func):
def inner():
start_time = time.time()
func()
end_time = time.time()
print("执行时间为：", end_time - start_time)
return inner
@show_time
def foo():
print("我是foo函数")
time.sleep(1)
foo()
3. Function with parameters + decorator without parameters
# -*- coding:utf-8 -*-
import time
def show_time(func):
def inner(*args, **kwargs):
start_time = time.time()
func(*args, **kwargs)
end_time = time.time()
print("执行时间为：", end_time - start_time)
return inner
@show_time
def foo(something):
print("我在：", something)
time.sleep(1)
foo("看电视")
4. Function with parameters + decorator with parameters
# -*- coding:utf-8 -*-
# -*- coding:utf-8 -*-
import time
def wrapper(name):
def show_time(func):
def inner(*args, **kwargs):
start_time = time.time()
func(*args, **kwargs)
end_time = time.time()
print(name)
print("执行时间为：", end_time - start_time)
return inner
return show_time
@wrapper("test") # wrapper("test")(foo)("看电视")
def foo(something):
print("我在：", something)
time.sleep(1)
foo("看电视")
Additional explanation:
1. Function:
(1) The function name can be used as a parameter
(2) The function name can be used as the return value
(3) Function name can be assigned
2. Closure: The function inside the function refers to the variable of the nested scope, then this internal function is called a closure (inner function is a closure)
