我作为一个初学者正在学习Python,并想创建一个名为Person
的类。在构造函数中,我想将每个实例放入一个名为“instances”的集合中。然后,我希望instances()方法返回所有实例。我该如何做到这一点?
class Person:
# Type annotations
__first_name: str
__last_name: str
instances: set
# Initializing variables
no_of_persons = 0
instances = set()
def __init__(self, firstname="unknown", lastname="unknown"):
self.__first_name = firstname
self.__last_name = lastname
Person.no_of_persons += 1
Person.instances.add() ## Here I have problems
@property
def first_name(self):
return self.__first_name
@first_name.setter
def first_name(self, firstname):
self.__first_name = firstname
@property
def last_name(self, ):
return self.__last_name
@last_name.setter
def last_name(self, lastname):
self.__last_name = lastname
def getFullName(self):
""" Returns a tuple of the firstname and the lastname """
return (self.__first_name, self.__last_name)
def summary(self):
""" Returns a dictionary of all instance variables """
return {'first_name': self.__first_name,
'last_name': self.__last_name}
@staticmethod
def number_of_persons():
return Person.no_of_persons
@staticmethod
def instances():
return Person.instances
p1 = Person()
Person.number_of_persons()
Person.instances()
type(<instance>).__subclasses__()
吗?或者如果你直接引用它的话,只需使用<class>.__subclasses__()
就可以了。 - miike3459