Closure:
Closure is a very practical way of writing in python, which allows users to call variables of functions outside the function in the function, making the variable resident in memory.
Closure function:
The input is a function, and the output is also a function.
The way decorators are written is syntactic sugar for python closures.
Call result questions that are often interviewed in interviews:
# ---encoding:utf-8---
# @Author : CBAiotAigc
# @Email ：[email protected]
# @Site :
# @File : 两个装饰器.py
# @Project : PythonUtils
# @Software: PyCharm
def wrapper1(func):
print("set wrapper1")
def inner_wrapper1(*args, **kwargs):
print("进入inner_wrapper1")
ret = func(*args, **kwargs)
print("离开inner_wrapper1")
return ret
return inner_wrapper1
def wrapper2(func):
print("set wrapper2")
def inner_wrapper2(*args, **kwargs):
print("进入inner_wrapper2")
ret = func(*args, **kwargs)
print("离开inner_wrapper2")
return ret
return inner_wrapper2
@wrapper1
@wrapper2
def func():
print("func 函数调用")
if __name__ == '__main__':
func()
The decorator enhances the first time the decorated function is called
- Enhancement timing? before the first call to
- Number of enhancements? enhance only once
Call logic analysis of the above code:
func = wrapper2(func)
func = wrapper1(func)
func()