python能做什么_python培训?

定义类   

class 类名[(父类)]:
类体

创建和使用

animal = Animal()
print(animal) *#<__main__.Animal object at 0x0000019A01FBBEB0>*

 print打印对象必须重写_str_()方法

类成员

成员变量

1.实例变量

2.类变量

属性

成员方法

1.实例方法

2.类方法

3.静态方法

class Person(object):

    def __init__(self,age,name,weight):
        # pass
        self.age = age
        self.name = name
        self.weight = weight

person1 = Person()
print("{0}".format(person1.age))  #没有给构造器传入参数，所以是错误的

#正确的是
person2 =Person(18,'小明',70)
print('年龄：{0} ,姓名：{1} ，体重 :{2}'.format(person2.age,person2.name,person2.weight

class Person(object):

    grade = '大二'

    def __init__(self,age,name,weight):
        # pass
        self.age = age
        self.name = name
        self.weight = weight

class Person(object):

    grade = '大二'

    def __init__(self,age,name,weight):
        # pass
        self.age = age
        self.name = name
        self.weight = weight

    def eat(self):
        self.weight += 10
        print('--eat--')
    
    def run(self):
        self.weight -= 10
        print('--run--')

person3 =Person(19,'小明',70)
print('小明的体重是：{0}'.format(person3.weight))

#通过实例调用方法
person2.eat()
print('小明的体重是：{0}'.format(person3.weight))
person3.run()
print('小明的体重是：{0}'.format(person3.weight))

class Person(object):

    grade = '大二'

    def __init__(self,age,name,weight):
        # pass
        self.age = age
        self.name = name
        self.weight = weight

    def eat(self):
        self.weight += 10
        print('--eat--')
    
    def run(self):
        self.weight -= 10
        print('--run--')

    **@classmethod        #类方法的装饰器
    def add(cls,sex):       #申明类方法时注意前面要用cls
        return cls.grade + sex      #只能调用类变量或类方法**

me = Person.add('：男')
print(me)

class Person(object):

    grade = '大二'

    def __init__(self,age,name,weight):
        # pass
        self.age = age
        self.name = name
        self.weight = weight

    def eat(self):
        self.weight += 10
        print('--eat--')
    
    def run(self):
        self.weight -= 10
        print('--run--')

    @classmethod        #类方法的装饰器
    def add(cls,sex):       #申明类方法时注意前面要用cls
        return cls.grade + sex      #只能调用类变量或类方法

    @staticmethod       #静态方法的装饰器
    def jing(sex):      #申明静态方法时注意前面什么都不需要
        return Person.add(sex)

me1 = Person.jing(':女')
print(me1)

me2 = Person(19,'小明',70)
print(me2.jing(':不男不女'))