A preliminary study on python decorators (recommended)-Python Tutorial-php.cn

A preliminary study on python decorators (recommended)

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Release： 2016-08-04 08:55:40

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1. Contains a decorator

#encoding: utf-8

############含有一个装饰器#########
def outer(func):
  def inner(*args, **kwargs):#要装饰f1（），这里用这俩形式参数，可以接受任意个参数，不管f1定义几个参数
    print "1"
    r = func(*args, **kwargs)#这里要用func，不要用f1
    print "2"
    return r
  return inner

@outer #这里outer不要加括号
def f1(a1, a2):
  print "a1 + a2 = "
  return a1 + a2

f1(1,2)

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2. Contains two (multiple) decorators

############含有二个装饰器#########

def outer0(func):#第一个
  def inner(*args, **kwargs):
    print "AAAAAAAAA"
    r = func(*args, **kwargs)
    print "BBBBBBBB"
    return r
  return inner

def outer(func): #第二个
  def inner(*args, **kwargs):#要装饰f1（），这里用这俩形式参数，可以接受任意个参数，不管f1定义几个参数
    print "1"
    r = func(*args, **kwargs)#这里要用func，不要用f1
    print "2"
    return r
  return inner
@outer0 #俩装饰器，流程就是：执行f1()的时候，先执行outer0.inner(),outer0.inner().func调用outer的inner函数，也就是outer.inner()函数作为outer0的参数，
     # 然后outer.inner().func再调用f1()
@outer #这里outer不要加括号
def f1(a1, a2):
  print "a1 + a2 = %d" %(a1+a2)
  return 1

f1(1,2)

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