list1 = []
while True:
    print("""
=====================================
歡迎:
    1. 添加學(xué)生
    2. 查看學(xué)生
    3. 修改學(xué)生信息
    4. 刪除學(xué)生
    5. 返回
=====================================
""")
    num = input('請(qǐng)選擇(1-5):')
    if num == '1':
        while True:
            student = dict.fromkeys(['姓名', '年齡', '成績(jī)', '電話'], None)
            for item in student:
                student[item] = input('請(qǐng)輸入%s:' % (item))
            list1.append(student)
            print('添加成功')
            print('1.繼續(xù)')
            print('2.返回')
            num = input('請(qǐng)輸入:')
            if num == '1':
                student = student.copy()
                continue
            else:
                break
    elif num == '2':
        while True:
            print('1.查看所有學(xué)生')
            print('2.按姓名查找')
            print('3.按電話查找')
            print(('4.返回'))
            num = input('請(qǐng)輸入:')
            if num == '1':
                    for item in list1:
                        name = item['姓名']
                        print(name)
            elif num == '2':
                while True:
                    name1 = input('請(qǐng)輸入姓名:')
                    for item in list1:
                        if item['姓名']==name1:
                            print(item)
                    print('1.繼續(xù)')
                    print('2.返回')
                    num3 = input('請(qǐng)輸入:')
                    if num3 == '1':
                        continue
                    else:
                        break
            elif num == '3':
                while True:
                    tel1 = input('請(qǐng)輸入電話號(hào)碼:')
                    for item in list1:
                        if item['電話'] == tel1:
                            print(item)
                    print('1.繼續(xù)')
                    print('2.返回')
                    num3 = input('請(qǐng)輸入:')
                    if num3 == '1':
                        continue
                    else:
                        break
            elif num == '4':
                break
    elif num == '3':
        while True:
            name2 = input('請(qǐng)輸入要修改信息的學(xué)生姓名:')
            for index in range(len(list1)):
                    if list1[index]['姓名']== name2:
                        for item in list1[index]:
                            list1[index][item] = input('請(qǐng)輸入%s:' % item)
                            list1[index] = list1[index]
            print('修改成功!')
            print('1.繼續(xù)')
            print('2.返回')
            num3 = input('請(qǐng)輸入:')
            if num3 == '1':
                continue
            else:
                break
    elif num == '4':
        while True:
            name3 = input('請(qǐng)輸入要?jiǎng)h除學(xué)生的姓名:')
            for item in list1:
                if item['姓名'] == name3:
                    list1.remove(item)
            print('刪除成功!')
            print('1.繼續(xù)')
            print('2.返回')
            num3 = input('請(qǐng)輸入:')
            if num3 == '1':
                continue
            else:
                break