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【Python】如何遍历取得类的子类或实例

作者:培政 / 发布于2015/4/14/ 608


	# coding:utf-8
	"""
	有人问如何遍历取得类的子类或实例
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	"""
	import weakref
	
	
	class Foo(object):
	 """取得类的所有实例方法。"""
	
	 instances = []
	
	 def __init__(self, name=None):
	 self.__class__.instances.append(weakref.proxy(self))
	 self.name = name
	
	
	def get_all_subclasses(cls):
	 """取得类的子类，子类的子类通过递归取得"""
	 all_subclasses = []
	
	 for subclass in cls.__subclasses__():
	 all_subclasses.append(subclass)
	 tmp = get_all_subclasses(subclass)
	 all_subclasses.extend(tmp)
	
	 return all_subclasses
	
	
	class Foo2(Foo):
	 pass
	
	
	class Foo3(Foo):
	 pass
	
	
	class Foo4(Foo2):
	 pass
	
	p1 = Foo('p1')
	p2 = Foo('p2')
	p3 = Foo('p3')
	p4 = Foo('p4')
	
	for instance in Foo.instances:
	 print(instance.name)
	
	print get_all_subclasses(Foo)

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