写一个班级类，属性：班级名、学生；功能：添加学生、查找学生

class Class:
    """班级类"""

    def __init__(self, name='', student=[]):
        self.class_name = name
        self.students = student

    def add_student(self):
        while True:
            name = input('name(input 0 to exit):')
            if name == '0':
                return
            sex = input('sex:')
            age = int(input('age:'))
            # 根据输入的信息创建学生对象
            stu = Student(name, sex, age)
            # 添加学生
            self.students.append(stu)

    def find_student(self, name):
        for index in range(len(self.students)):
            if name == self.students[index].name:
                return self.students[index]


class Student:
    """学生类"""

    def __init__(self, name='', sex='', age=0):
        self.name = name
        self.sex = sex
        self.age = age

    def __str__(self):
        return 'name:%s sex:%s age:%d' % (self.name, self.sex, self.age)


if __name__ == '__main__':
    cls1 = Class('py1805')
    cls1.add_student()

    for index in range(len(cls1.students)):
        print(cls1.students[index])

    while True:
        name = input('find student by name(input 0 to exit):')
        if name == '0':
            break
        stu = cls1.find_student(name)
        print(stu)

结果：

name(input 0 to exit):张三
sex:男
age:20
name(input 0 to exit):李四
sex:男
age:25
name(input 0 to exit):王五
sex:女
age:19
name(input 0 to exit):0
name:张三 sex:男 age:20
name:李四 sex:男 age:25
name:王五 sex:女 age:19
find student by name(input 0 to exit):张三
name:张三 sex:男 age:20
find student by name(input 0 to exit):李四
name:李四 sex:男 age:25
find student by name(input 0 to exit):王五
name:王五 sex:女 age:19
find student by name(input 0 to exit):0

Process finished with exit code 0