01.03 作业

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'},

] 

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

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'}

while True:
    for i in range(4):
        name = input('姓名: ')
        all_students[i]['name'] = name
        age = input('年龄: ')
        all_students[i]['age'] = age
        score = input('成绩: ')
        all_students[i]['score'] = score
        tel = input('电话: ')
        all_students[i]['tel'] = tel
        print('-'*30)
    print(all_students)
    break

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'

while True:
    name = input('请输入要查询的姓名：')
    if name == 'end':
        break
    for data in all_students:
        if name == data['name']:
            for key, value in data.items():
                print(key, value)
    continue
    print('未找到学生，请重新输入。')

3.求所有学生的平均成绩和平均年龄

sum = 0
for data in all_students:
    sum += data['age']
print('平均年龄：',sum / 4)

sum = 0
for data in all_students:
    sum += data['score']
print('平均成绩：',sum / 4)

4.删除班级中年龄小于18岁的学生

for data in all_students:
    if data['age'] < 18:
        for key in data:
            data[key] = ''
print(all_students)

提高作业

all_students = []
mainmenu = {1: '添加学生', 2:'查看学生', 3: '修改学生信息', 4:'删除学生', 5: '返回'}
submenu_2 = {1: '查看所有学生', 2: '按姓名查找', 3: '按学号查找', 4: '返回'}
submenu_3 = {1: '按姓名修改', 2: '按学号修改', 3: '返回'}
submenu_4 = {1: '删除所有学生', 2: '按姓名删除', 3: '按学号删除', 4: '返回'} 

def getNum(text : str) -> str:
    while True:
        num = input(text)
        if len(num) == 4 and num.isdigit():
            return num
        else:
            print('错误，学号为4位数字！请重新输入') 

def getName(text : str) -> str:
    name = input(text)
    return name 

def getTel(text : str) -> str:
    while True:
        tel = input(text)
        if len(tel) == 11 and tel.isdigit():
            return tel
        else:
            print('错误，电话号码为11位数字！请重新输入')

def getAge(text : str) -> str:
    while True:
        age = input(text)
        if age.isdigit() and 1 <= len(age) <= 2:
            return age
        else:
            print('年龄不合规范！请输入正确的年龄。') 

def matchDataAndOperate(data, value, tag, func):
    if all_students == []:
        print('=' * 56)
        print('目前没有学生！请添加学生。')
        print('=' * 56)
    elif tag == '':
        for data_students in data:
            func(data_students, tag, value) 
    elif tag != '':
        for data_students in data:
            if value == data_students[tag]:
                func(data_students, tag, value)
                break
        else: 
            print('没有找到该学生')

def appendStudentData(data, all_students):
    all_students.sort(key = lambda x: x['num'])
    name = getName('请输入要修改的学生姓名：')
    if all_students == []:
        num = '0001'
    else:
        while True:
            for data_students in all_students:
                if all_students.index(data_students) + 1 < int(data_students['num'][-1]):
                    num = str(int(data_students['num'][-1]) - int(all_students.index(data_students)) - 1).rjust(4, '0')
                    break
                else:
                    num = str(len(all_students) + 1).rjust(4, '0')
            break
    age = getAge('请输入要修改的学生年龄：')
    tel = getTel('请输入要修改的学生电话：')
    data['name'] = name
    data['num'] = num 
    data['tel'] = tel
    data['age'] = age
    print('添加完成')
    showStudentData(data)
    return data

def changeStudentData(data, tag = None, value = None):
    if tag == 'num':
        print('修改学号：%s同学的信息' % value)
    elif tag == 'name':
        print('修改姓名：%s同学的信息' % value)
    ifchangeage = input('是否更改年龄？[y/n]')
    if ifchangeage == 'y':
        age = getAge('请输入修改后的学生年龄：')
    elif ifchangeage == 'n':
        age = data['age']
    ifchangetel = input('是否更改电话号码？[y/n]')
    if ifchangetel == 'y':
        tel = getTel('请输入修改后的学生电话号码：')
    elif ifchangetel == 'n':
        tel = data['tel']
    data['tel'] = tel
    data['age'] = age
    print('修改完成')
    showStudentData(data)
    
def showStudentData(data, tag = None, value = None):
    print('学生%s的信息如下：' % data['name'])
    print(' ')
    print('学号:', data['num'].ljust(5, ' '), end = '')
    print('学生:', data['name'].ljust(8, ' '), end = '')
    print('年龄:', data['age'].ljust(5, ' '), end = '')
    print('电话:', data['tel'].ljust(11, ' '), end = '')
    print('')
    print('=' * 56)    

def delStudentData(data, tag = None, value = None):
        all_students.remove(data)
        print('删除成功')

def mainMenuReturnChoice(mainmenu) -> str:
    print('=' * 36)
    print(chr(0x1f338) * 2, '欢迎：')
    print('')
    print('')
    for key, value in mainmenu.items():
        print(chr(0x1f537) * 2, '%d.\t%s' % (key, value))
    print('')
    print('=' * 36)
    choice = input('请选择(1-5)：')
    return choice

def subMenuReturnChoice(submenu) -> str:
    for key, value in submenu.items():
        print(key,'. ',value)
    choice = input('请选择：')
    print(' ')
    return choice

def choiceExitorNot(funcname) -> str:
    print('1. 继续%s\n2. 返回主菜单' % funcname)
    cmd = input('请选择(1-2): ')
    return cmd 

def endTips():
    print('=' * 36)
    print('请根据提示进行选择。')
    print('=' * 36) 

while True:
    choice = mainMenuReturnChoice(mainmenu)
    if choice == '1':
        while True:
            data_students = {'num': '','name':'', 'age': '', 'tel':''}
            data = appendStudentData(data_students, all_students)
            all_students.append(data)
            cmd = choiceExitorNot('添加')
            if cmd == '1':
                continue
            else:
                break
    elif choice == '2':
        all_students.sort(key = lambda x: x['num'])
        while True:
            choice_2 = subMenuReturnChoice(submenu_2)
            if choice_2 == '1':
                matchDataAndOperate(all_students, '', '',showStudentData)
            elif choice_2 == '2':
                name = getName('请输入要查找的学生姓名：')
                matchDataAndOperate(all_students, name, 'name', showStudentData)
            elif choice_2 == '3':
                num = getNum('请输入要查询的学生学号：')
                print(' ')
                matchDataAndOperate(all_students, num, 'num', showStudentData) 
            elif choice_2 == '4':
                break
            else:
                endTips()
                continue
    elif choice == '3':
        while True:
            choice_3 = subMenuReturnChoice(submenu_3)
            if choice_3 == '1':
                name = getName('请输入要修改的学生姓名：')
                print(' ')
                matchDataAndOperate(all_students, name, 'name', changeStudentData)
                cmd = choiceExitorNot('修改')
                if cmd == '1':
                    continue
                else:
                    break
            elif choice_3 == '2':
                num = getNum('请输入要修改的学生学号：')
                print(' ')
                matchDataAndOperate(all_students, num, 'num', changeStudentData)
                cmd = choiceExitorNot('修改')
                if cmd == '1':
                    continue
                else:
                    break
            elif choice_3 == '3':
                break 
            else:
                endTips()
                continue
    elif choice == '4':
        while True:
            choice_4 = subMenuReturnChoice(submenu_4)   
            if choice_4 == '1':
                for data in all_students[:]:
                    delStudentData(data)
                print('返回主菜单。')
                break
            elif choice_4 == '2':
                name = getName('请输入要删除的学生姓名：')
                print(' ')
                matchDataAndOperate(all_students, name, 'name', delStudentData)
                cmd = choiceExitorNot('删除')
                if cmd == '1':
                    continue
                else:
                    break
            elif choice_4 == '3':
                num = getNum('请输入要删除的学生学号：')
                print(' ')
                matchDataAndOperate(all_students, num, 'num', delStudentData)
                cmd = choiceExitorNot('删除')  
                if cmd == '1':
                    continue
                else:
                    break
            elif choice_4 == '4':
                break 
            else:
                endTips()
                continue
    elif choice == '5':
        cmd = choiceExitorNot('退出')
        if cmd == '1':
            print('退出')
            break
        else:
            continue
    else:
        endTips()
        continue