Pyuthon类与对象练习

'''
def student_add():
    #pass
    print("p")

def student_delete():
    #pass
    print("b")

#1.声明类
class Student(object):
    #  类属性
    class_name = "34期"
    num = "30人"
    # 方法
    def listen(self):
        print("听课")

    def homework(self):
        print("写作业")

#2.实例化对象 ： 类名()
s1 = Student()
s2 = Student()
print(id(s1),id(s2)) # 1947621752784 1947621752592

#3.对象通过句点符号调用属性和方法
print(s1.class_name)  # 32期
print(s1.num)  # 30人
s1.listen() # 听课
s1.homework() # 写作业

#4.设置实例属性
s1.name = "zhubiao"
s1.age = 31


# 实例对象.变量的查询顺序
print(s1.name) # zhubiao
print(s1.class_name) # 34期

#5.结论：类属性只能查不能改
s1.clsas_name = "33期"
print(s1.clsas_name) # 33期

# 类属性修改
Student.clsas_name = "34期"
print(s1.clsas_name) # 33期
print(s2.clsas_name) # 34期
'''