定义一个函数：
def outer():
def inner():
print("this is first func")
print("this is end func")
return inner
t=outer()
print(t)
t()
"""
<function outer.<locals>.inner at 0x00000000006D01E0>
this is first func
this is end func
"""
在不改变原来函数的情况下 怎么样在
print("this is first func")
print("this is end func")
之间加一个功能呢！！
def outer(fun):
def inner():
print("this is first func")
fun()
print("this is end func")
return inner
def fun():
print("this is a new func")
fun=outer(fun)
print(fun)
print(fun())
"""
<function outer.<locals>.inner at 0x0000000000B90268>
this is first func
this is a new func
this is end func
None
"""
使用装饰器：
def outer(fun):
def inner():
print("this is first func")
fun()
print("this is end func")
return inner
@outer # ===> fun=outer(fun)
def fun():
print("this is a new func")
fun()
"""
this is first func
this is a new func
this is end func
"""