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巧用Python装饰器 免去调用父类构造函数的麻烦

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2016-06-16 08:47:051290browse

先看一段代码:

复制代码 代码如下:

class T1(threading.Thread):
def __init__(self, a, b, c):
super(T1, self).__init__()
self.a = a
self.b = b
self.c = c

def run(self):
print self.a, self.b, self.c

代码定义了一个继承自threading.Thread的class,看这句

super(T1, self).__init__()

也有些人喜欢这么写

threading.Thread.__init__(self)

当然作用都是调用父类的构造函数。

写了这么久的python代码,每次写到这都有重复造轮子的感觉。刚才突然想到装饰器这个好东西,试着写了个autoInitClass来帮助pythoner脱离苦海,免去手动调用父类构造函数的麻烦。
代码如下:
复制代码 代码如下:

def autoInitClass(OldClass):
superClass = OldClass.mro()[1]
class NewClass(OldClass):
def __init__(*args):
self = args[0]
superClass.__init__(self)
apply(OldClass.__init__, args)
return NewClass

使用autoInitClass装饰器构造新类:

复制代码 代码如下:

@autoInitClass
class T2(threading.Thread):
def __init__(self, a, b, c):
#不用再写super(T2, self).__init__()
self.a = a
self.b = b
self.c = c

def run(self):
print self.a, self.b, self.c

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