Python decorator implementation class Java annotations

 

Recently I wanted to use Python to write a simple generator, similar specify the type and extent of return specified list;

 

For example we want an integer of 0 to 3, and then I just need to specify:

　　Minimum: 0,

　　Maximum: 3,

　　Step: 1

 

A [0,1,2,3] List Return

 

The idea is to use Python decorators to play in def decorator, passing when called decorator interior replacement method parameter values

code show as below:

 

 1 # coding=utf-8
 2 
 3 def integer(min=0, max=100, step=1):
 4   def deco(func):
 5     def wrapper(val):
 6       val = []
 7       for i in range(min, max, step):
 8         val.append(i)   # 将入参修改掉
 9       return func(val)
10     return wrapper
11   return deco
12 
13 
14 @integer(1, 40)
15 def id(val):
16   return val
17 
18 a = id(None)
19 print(a)

 

The value of such a printed list of what I want:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22,
23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39]

Than Java annotation to write much more convenient, Python Dafa is good!