Python closure function, adorner

The method of passing the value of the closure function:

Method 1: Pass the value through the parameter

Func (x):
    Print (x)
Func (1)

Method 2: Value of the closure function

def outter (x):
def Inner ():
Print (x)
return Inner
F=outter (1)
F ()

Adorner:

Decoration refers to adding additional functionality to the adorner object.

The implementation of the adorner must follow the principle of mass:

1. Do not modify the source code of the object being decorated

2. Do not modify the Decorated object debugging mode

Evolution of the non-parametric adorner:

Mode 1:

Import time
DefIndex ():
Time.sleep (3) 
 print ( ' Welcome to index page ') 
 
 def outter ( func  ):  #func = Initial index 
  # Func=index 
  def wrapper (): 
 Start_time= Time.time () 
   func ()   # Call the most original index 
  Stop_time=time.time () 
 print (stop_ Time-start_time) 
 return wrapper 
 Index=outter (index)  #新的index =wrapper 
 Index ()  #wrapper 
  

Mode 2: When the function is visible, think

Import time
# DEF index ():
# Time.sleep (1)
# print (' Welcome to index page ')
# return 123

DefHome (name):
Time.sleep (2)
 Print' Welcome%s to home page '%name)
#============== Decorator
DefOutter (func):#func = Initial Index
# Func=index
 Defwrapper (name): 
 Start_time=time.time () 
   Res=func (name)   # Calling the most primitive index also calls the most primitive home, but when the home is passed the value is the physical parameter name inside the  
  Stop_time=time.time () 
 print (stop_time-start_time) 
   return res   
 return wrapper 
 # index=outter (Index) #新的index =wrapper 
 # index () 
 Home=outter (Home) Span style= "COLOR: #808080" > #新的home =wrapper 
  home    (    ' Yangzhizong ')   
          

Mode 3:

Import time
DefIndex ():
Time.sleep (1)
    Print' Welcome to index page ')

DefHome (name):
Time.sleep (2)
 Print' Welcome%s to home page '%name)
#============== Decorator
DefTimmer (func):#func = The initial index and the most initial home
# Func=index
 DefWrapper(*args, **kwargs):
Start_time=time.time ()
Res=func(*args , **kwargs) The #调用最原始的index also calls the original home, but the home is in the value of the physical parameter name in the
Stop_time=time.time ()
Print (Stop_time-start_time)
  return res
return Wrapper
Index=timmer (index) #新的index =wrapper
Index ()
 Home=timmer (home)  #新的home =wrapper
Home (' Yangzhizong ')

Mode 4: Final version

Import time
DefTimmer (func):
    DefWrapper (*args, **kwargs):
Start_time=time.time ()
Res=func (*args, **kwargs)
Stop_time=time.time ()
 Print (Stop_time-start_time)
 return res
 Return wrapper

 @timmer  #index =timmer (Index)
def index ():
Time.sleep (1)
print (' Welcome to index page ')
 @timmer    #home =timmer (home)
def Home (name):
Time.sleep (2)
print (' Welcome%s to home page '%name)

Index ()
Home (' Yangzhizong ')             

Adorner: (Fixed and unchanging writing format)

outer (func):
    Inner (*args, **kwargs):
Res=fun (*args, **kwargs)
return res
Res inner

Python closure function, adorner