这动态地定义了一个新类GentlePerson
,并p
为其分配了新的类:
class Gentleman(object):
def introduce_self(self):
return "Hello, my name is %s" % self.name
class Person(object):
def __init__(self, name):
self.name = name
p = Person("John")
p.__class__ = type('GentlePerson',(Person,Gentleman),{})
print(p.introduce_self())
# "Hello, my name is John"
根据您的要求,这会修改p
的基础,但不会更改其p
原始类Person
。因此,的其他实例Person
不受影响(并且会引发AttributeError
ifintroduce_self
的调用)。
尽管没有在问题中直接提出要求,但我将为Googlers和好奇心求助者补充说,也可以动态更改类的基础,但前提是(AFAIK)仅当该类不直接继承自object
:
class Gentleman(object):
def introduce_self(self):
return "Hello, my name is %s" % self.name
class Base(object):pass
class Person(Base):
def __init__(self, name):
self.name = name
p = Person("John")
Person.__bases__=(Gentleman,object,)
print(p.introduce_self())
# "Hello, my name is John"
q = Person("Pete")
print(q.introduce_self())
# Hello, my name is Pete