类和数据类型

类和数据类型

一、类与数据类型

python3中统一了类与类型的概念，类就是类型

class Foo:
    pass


obj = Foo()
print(type(obj))

<class '__main__.Foo'>

lis = [1, 2, 3]
lis2 = [4, 5, 6]
print(type(lis))

<class 'list'>

• lis和lis2都是实例化的对象，因此lis使用append方法和lis2无关

lis.append(7)
print(lis)

[1, 2, 3, 7]

print(lis2)

[4, 5, 6]

二、list.append()方法原理

class OldboyStudent:
    school = 'oldboy'

    def __init__(self, name, age, gender):
        self.name = name
        self.age = age
        self.sex = gender

    def choose_course(self, name):
        print(f'{name} choosing course')


stu1 = OldboyStudent('nick', 18, 'male')

stu1.choose_course(1)  # OldboyStudent.choose_course(stu1, 1)

1 choosing course

OldboyStudent.choose_course(stu1, 1)

1 choosing course

lis = [1, 2, 3]  # lis = list([1,2,3])
print(type(lis))

<class 'list'>

lis.append(4)  # list.append(lis,4)
print(lis)

[1, 2, 3, 4]

list.append(lis, 5)
print(lis)

[1, 2, 3, 4, 5]