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day8作业

day8作业

作者: y_j杨健 | 来源:发表于2019-01-03 20:56 被阅读0次

    使用一个变量all_students保存一个班的学生信息(4个),每个学生需要保存:姓名、年龄、成绩、电话

    all_students = [
        {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
        {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
        {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
        {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
    ] 
    
    all_studens = []
    for x in range(1,5):
        new_name = input('请输入第%位学生姓名:' % x)
        new_age = int(input('请输入第%位学生年龄:'% x))
        new_score = int(input('请输入第%位学生成绩:'% x))
        new_tel = int(input('请输入第%位学生电话:'% x))
        dict1 = {'name':new_name,'age':new_age,'score':new_score,'tel':new_tel}
        all_studens.append(dict1)
    print(all_studens)
    

    1.添加学生:输入学生信息,将输入的学生的信息保存到all_students中

    while True:
        char = input('是否输入信息:')
        if char == '是':
            name = input('输入姓名:')
            age = int(input('输入年龄:'))
            score = int(input('输入成绩:'))
            tel = int(input('输入电话:'))
            dict1 = {'name':name,'age':age,'score':score,'tel':tel}
    print(dict1)
    
    例如输入:
    姓名: 小明
    年龄: 20
    成绩: 100
    电话: 111922  
    那么就在all_students中添加{'name':'小明', 'age': 20, 'score': 100, 'tel':'111922'}
    

    2.按姓名查看学生信息:

    例如输入:
    姓名: stu1 就打印:'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'
    
    list1 = [
        {'name':'stu1','age':18,'score':89,},
        {'name':'stu2','age':28,'score':65,},
        {'name':'stu3','age':23,'score':75,},
        {'name':'stu4','age':25,'score':99,}
    ]
    new_name = input('输入学生姓名:')
    count = 0
    for dict1 in list1:
        if new_name == dict1['name']
            print(dict1)
            count += 1
    if count == 0:
        print('没有该学生')
    

    3.求所有学生的平均成绩和平均年龄

    all_students = [
        {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
        {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
        {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
        {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
    ] 
    new_age = 0
    new_score = 0
    for dict1 in all_studens:
        age = dict1['age']
        score = dict1['score']
        new_age += age
        new_score += score
    avre_age = new_age / len(all_studens)
    avre _score = new_score / len(all_studens)
    print('所有学生的平均成绩为:%.1f,平均年龄:%.1f' % (avre_score,avre_age))
    

    4.删除班级中年龄小于18岁的学生

    all_students = [
        {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
        {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
        {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
        {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
    ] 
    for dict1 in all_students:
        if dict1['age']  < 18:
            dict1.clear()
    print(all_students)
    

    5.统计班级中不及格的学生的人数

    all_students = [
        {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
        {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
        {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
        {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
    ] 
    
    num = 0
    for dict1 in all_students:
        if dict1['score'] <60:
            num +=  1
    print('班级中不及格的学生的人数:%d' % num)
    

    6.打印手机号最后一位是2的学生的姓名

    all_students = [
        {'name':'stu1', 'age': 19, 'score':81, 'tel':'192222'},
        {'name':'stu2', 'age': 29, 'score':90, 'tel':'211222'},
        {'name':'stu3', 'age': 12, 'score':67, 'tel':'521114'},
        {'name':'stu4', 'age': 30, 'score':45, 'tel':'900012'},
    ] 
    for dict1 in all_students:
        char = dict1['tel']
        if char[-1] == '2':
            print(dict1['name'])
        
    

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