编写千峰学生管理系统。
logon_student_account = {}
student_info_dict={}
login_count_student_info_dict={}
while True:
str1 = 'welcome QianFeng student manager system'
print(str1)
print(' 1.Login登录')
print(' 2.logon注册')
print(' 3.Quit')
num1 =int(input('请选择：'))
if num1 == 2:
while True:
a =0 #借助a的值来执行最后的break，跳出外面的while循环。
logon_student_account_name =input('请输入用户名（3-10位）：')
if len(logon_student_account_name) >=3 and len(logon_student_account_name)<=10 and not logon_student_account_name in logon_student_account:
print('用户名可用！')
while True:
logon_student_account_password = input('请输入密码(6-16位)：')
if 6<=len(logon_student_account_password)<=16:
logon_student_account_password1=input('请再次输入密码)：')
if logon_student_account_password == logon_student_account_password1:
print('注册成功')
logon_student_account.setdefault(logon_student_account_name,logon_student_account_password)
a= 1
break
else:
print('密码不对，请重新输入')
else:
print('密码不符合要求')
else:
print('用户名不可用，请重新输入')
if a == 1:
break
if num1 ==1:
while True:
login_student_account_name = input('请输入用户名：')
if login_student_account_name in logon_student_account:
login_student_account_password = input('请输入密码：')
if login_student_account_password==logon_student_account[login_student_account_name]:
print('登陆成功！！！')
break
else:
print('用户名不正确！！！')
while True:
print('1.Add Student')
print('2.Find Student')
print('3.Delete Student')
print('4.Revise StudentInfo')
print('5.Back')
number=input('请选择：')
if number in '1,2,3,4，5':
num2 =int(number)
else:
print('请填写正确选项！！！')
continue
if num2 == 1:
while True:
add_student_name = input('请输入学生的姓名：')
add_student_age = input('请输入学生的年龄：')
add_student_tel = input('请输入学生的电话：')
student_info_dict.setdefault(add_student_name,[add_student_age,add_student_tel]) #将学生信息作为一个键值对放在字典中
login_count_student_info_dict.setdefault(login_student_account_name,student_info_dict) #将登录的账户名与所有学生的信息字典关联起来
print('添加成功！')
print('1.继续添加')
print('2.返回')
num = int(input('请选择：'))
if num == 2:
break
if num2 ==2:
find_student_name = input('请输入查找学生姓名：')
if login_count_student_info_dict.get(login_student_account_name) == None:
print('没有添加学生信息')
elif find_student_name in login_count_student_info_dict[login_student_account_name]:
print('姓名：%s,年龄：%s,电话：%s'%(find_student_name,login_count_student_info_dict[login_student_account_name][find_student_name][0],login_count_student_info_dict[login_student_account_name][find_student_name][1]))
else:
print('查无此人！！！')
if num2 ==3:
delete_student_name=input('请输入删除学生姓名：')
if login_count_student_info_dict.get(login_student_account_name) == None:
print('没有添加学生信息')
elif delete_student_name in login_count_student_info_dict[login_student_account_name]:
del login_count_student_info_dict[login_student_account_name][delete_student_name]
print('删除成功！！！')
else:
print('无此学生，无法删除！！！')
if login_count_student_info_dict.get(login_student_account_name) == None:
continue
if login_count_student_info_dict[login_student_account_name] != {}:
print('剩余学生信息：')
for item in login_count_student_info_dict[login_student_account_name]:
print('姓名：%s,年龄：%s,电话：%s' % (
item, login_count_student_info_dict[login_student_account_name][item][0],
login_count_student_info_dict[login_student_account_name][item][1]))
if num2 == 4:
revise_student_name = input('请输入要修改学生姓名：')
if login_count_student_info_dict.get(login_student_account_name) == None:
print('没有添加学生信息')
elif revise_student_name in login_count_student_info_dict[login_student_account_name]:
print('1.修改年龄')
print('2.修改电话')
num = int(input('请选择：'))
if num ==1:
new_age = input('请输入新的年龄：')
login_count_student_info_dict[login_student_account_name][revise_student_name][0]=new_age
if num ==2:
new_tel = input('请输入新的的电话：')
login_count_student_info_dict[login_student_account_name][revise_student_name][0] = new_tel
if login_count_student_info_dict.get(login_student_account_name) == None:
continue
if login_count_student_info_dict[login_student_account_name] != {}:
print('修改后学生信息：')
for item in login_count_student_info_dict[login_student_account_name]:
print('姓名：%s,年龄：%s,电话：%s' % (
item, login_count_student_info_dict[login_student_account_name][item][0],
login_count_student_info_dict[login_student_account_name][item][1]))
if num2 ==5:
break
if num1 ==3:
break
