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class Person(object):

? ? def __init__(self, name, gender, **kw):

? ? ? ? self.name = name

? ? ? ? self.gender = gender

? ? ? ? for k, v in kw.items():

? ? ? ? ? ? setattr(self, k, v)

p = Person('Bob','Male',age=18,course='Python')

print(p.age)

print(p.course)

class Person(object):

? ? def __init__(self, name, gender):

? ? ? ? self.name = name

? ? ? ? self.gender = gender

class Student(Person):

? ? def __init__(self, name, gender, score):

? ? ? ? super(Student, self).__init__(name, gender)

? ? ? ? self.score = score

class Teacher(Person):

? ? def __init__(self, name, gender, course):

? ? ? ? super(Teacher, self).__init__(name, gender)

? ? ? ? self.course = course

class SkillMixin(object):

? ? def __init__():

? ? ? ? pass

class BasketballMixin(SkillMixin):

? ? def __init__():

? ? ? ? pass

class FootballMixin(SkillMixin):

? ? def __init__():

? ? ? ? pass

class Student_Basketball(Student,BasketballMixin):

? ? def __init__(self,name,gender,score):

? ? ? ? super(Student_Basketball,self).__init__(name,gender,score)

class Teacher_Football(Teacher,FootballMixin):

? ? def __init__(self,name,gender,course):

? ? ? ? super(Teacher_Football,self).__init__(name,gender,course)

class Person(object):

? ? def __init__(self, name, gender):

? ? ? ? self.name = name

? ? ? ? self.gender = gender

class Student(Person):

? ? def __init__(self, name, gender, score):

? ? ? ? super(Student, self).__init__(name, gender)

? ? ? ? self.score = score

class Teacher(Person):

? ? def __init__(self, name, gender, course):

? ? ? ? super(Teacher, self).__init__(name, gender)

? ? ? ? self.course = course

p = Person('Tim', 'Male')

s = Student('Bob', 'Male', 88)

t = Teacher('Alice', 'Female', 'English')

print(isinstance(t,Person))

print(isinstance(t,Student))

print(isinstance(t,Teacher))

class Person(object):

? ? def __init__(self, name, gender):

? ? ? ? self.name = name

? ? ? ? self.gender = gender

class Teacher(Person):

? ? def __init__(self,name,gender,subject):

? ? ? ? super(Teacher,self).__init__(self,name,gender)

? ? ? ? self.subject = subject

class Animal():

? ? __count = 0

? ? @classmethod

? ? def get_count(cls):

? ? ? ? return cls.__count

? ? def __init__(self, name, age, localtion):

? ? ? ? self.__name = name

? ? ? ? self.__age = age

? ? ? ? self.__localtion = localtion

? ? ? ? Animal.__count += 1

? ? def get_name(self):

? ? ? ? return self.__name

? ? def get_age(self):

? ? ? ? return self.__age

? ? def get_localtion(self):

? ? ? ? return self.__localtion

? ? def set_name(self,name):

? ? ? ? self.__name = name

? ? ? ? return

? ? def set_age(self,age):

? ? ? ? self.__age = age

? ? ? ? return

? ? def set_localtion(self,localtion):

? ? ? ? self.__localtion = localtion

? ? ? ? return

? ? def print_info(self):

? ? ? ? print('The name is : ' + self.__name)

? ? ? ? print('The age is :' + str(self.__age))

? ? ? ? print('The localtion is : ' + self.__localtion)

? ?

dog = Animal('wangcai', 3, 'Beijing')

print(Animal.get_count())

dog.print_info()

class Animal():

? ? def __init__(self, name, age, localtion):

? ? ? ? self.__name = name

? ? ? ? self.__age = age

? ? ? ? self.__localtion = localtion

? ? def get_name(self):

? ? ? ? return self.__name

? ? def get_age(self):

? ? ? ? return self.__age

? ? def get_localtion(self):

? ? ? ? return self.__localtion

? ? def set_name(self,name):

? ? ? ? self.__name = name

? ? ? ? return

? ? def set_age(self,age):

? ? ? ? self.__age = age

? ? ? ? return

? ? def set_localtion(self,localtion):

? ? ? ? self.__localtion = localtion

? ? ? ? return

? ? def print_info(self):

? ? ? ? print('The name is : ' + self.__name)

? ? ? ? print('The age is :' + str(self.__age))

? ? ? ? print('The localtion is : ' + self.__localtion)

? ?

dog=Animal('wangcai',3,'Beijing')

dog.print_info()

class Animal():

? ? __count = 0

? ? __age = 0

? ? def __init__(self,name,age):

? ? ? ? self.name = name

? ? ? ? self.__age = age

? ? ? ? self.__count += 1

dog=Animal('wangcai',3)

print(dog.age)

class Animal():

? ? __count = 0

? ? def __init__(self,name,age):

? ? ? ? self.name = name

? ? ? ? self.age = age

? ? ? ? Animal.__count += 1

dog=Animal('wangcai',3)

print(Animal.__count)

print(dog.__count)

class Animal():

? ? _count = 0

? ? def __init__(self,name,age):

? ? ? ? self.name = name

? ? ? ? self.age = age

? ? ? ? Animal._count += 1

dog=Animal()

print(Animal._count)

print(dog._count)

class Animal():

? ? count = 0

? ? def __init__(self,name,age):

? ? ? ? self.name = name

? ? ? ? self.age = age

? ? ? ? Animal.count += 1

dog = Animal('wangcai',5)

print(dog.count)

cat = Animal('mimi',3)

print(dog.count,cat.count)

print(dog.name,dog.age)

print(cat.name,cat.age)

class Animal():

? ? def __init__(self,name,age):

? ? ? ? self.name = name

? ? ? ? self.age = age

dog = Animal('wangcai',5)

cat = Animal('mimi',3)

print(dog.name,dog.age)

print(cat.name,cat.age)

class Animal():

? ? pass

dog = Animal()

cat = Animal()

dog.name='wangcai'

cat.name='mimi'

dog.age=5

cat.age=3

print(dog.name,dog.age)

print(cat.name,cat.age)

class Animal():

? ? pass

dog = Animal()

cat = Animal()

print(dog)

print(cat)

class Animal:
??? __count = 0
??? def __init__(self,name):
??????? self.name = name
??????? Animal.__count += 1 #類的實(shí)例數(shù)量
dog =? Animal("wangwang")
cat = Animal("mimi")
bird = Animal("jiji")
print(Animal.__count)

In the given Python code, the line Animal.count += 1 is using the class name Animal rather than self for incrementing the count variable. This is because count is a class variable, shared by all instances of the Animal class.

When you use Animal.count, you are directly accessing the class variable and incrementing its value. This means that every time a new instance of the Animal class is created, the count variable is incremented for the entire class, not just for the specific instance.

On the other hand, if you were to use self.count += 1 in the __init__ method, it would create an instance variable count specific to each instance of the class. In that case, each instance would have its own separate count value.

class Animal:
??? count = 0
??? def __init__(self,name):
??????? self.name = name
??????? self.count += 1
dog =? Animal("wangwang")
cat = Animal("mimi")
bird = Animal("jiji")
print(dog.count)#獨(dú)立計(jì)算每個實(shí)例都個數(shù)，都是1

print(Animal.count)#類變量為0

class Animal:
??? __count = 0
?? ?
??? def __init__(self,name):
??????? self.name = name
??????? Animal.__count +=1
?? ?
??? @classmethod
??? def get_count(cls):
??????? return cls.__count
?????? ?
dog = Animal("wangwang")
cat = Animal("mimi")
print(Animal.get_count())