python基础小练习

def main():
    number = int(input("请输入学生的总人数:"))                                         # 输入要录入的学生总数
    count = number                                                                  # 用一个变量来保存这个学生总数
    students = list()                                                               # 创建一个列表来存储学生信息
    while(number):                                                                  # 进入循环
        student = {}                                                                # 学生信息列表
        name = input("请输入学生的姓名:")                                              # 输入学生姓名
        student['name'] = name                                                      # 字典赋值
        gender = input("请输入他的性别:")                                             # 输入性别
        student['gender'] = gender                                                  # 字典赋值
        students.append(student)                                                    # 将这个信息新增到列表
        number -= 1                                                                 # 学生总数-1
    print("%d 个学生信息是==========>   %s"%(count, students))                        # 循环结束，打印列表信息

if __name__ == '__main__':
    main()

# 学生信息录入展示代码

# 输入要录入的学生总数

# 录入学生基本信息

# 学生信息录入完毕展示给用户

 import os
 import re
 import numpy as np

 class Student: #定义一个学生类
     def __init__(self):
         self.name = ''
         self.ID =''
         self.score1 = 0
         self.score2 = 0
         self.score1 = 0
         self.sum = 0

 def searchByID(stulist, ID): #按学号查找看是否学号已经存在
     for item in stulist:
         if item.ID == ID:
             return True

 def Add(stulist,stu): #添加一个学生信息
     if searchByID(stulist, stu.ID) == True:
         print("学号已经存在！")
         return False
     stulist.append(stu)
     print( stu.name,stu.ID, stu.score1, stu.score2, stu.score3, stu.sum)
     print( "是否要保存学生信息？")
     nChoose = input("Choose Y/N")
     if nChoose == 'Y' or nChoose == 'y':
         file_object = open("students.txt", "a")
         file_object.write(stu.ID)
         file_object.write(" ")
         file_object.write(stu.name)
         file_object.write(" ")
         file_object.write(str(stu.score1))
         file_object.write(" ")
         file_object.write(str(stu.score2))
         file_object.write(" ")
         file_object.write(str(stu.score3))
         file_object.write(" ")
         file_object.write(str(stu.sum))
         file_object.write("\n")
         file_object.close()
         print( u"保存成功！")

 def Search(stulist, ID): #搜索一个学生信息
     print( "学号   姓名    语文    数学    英语    总分")
     count = 0
     for item in stulist:
         if item.ID == ID:
             print( item.ID, '\t' ,item.name,'\t', item.score1,'\t',item.score2, '\t', item.score3, '\t',item.sum)
             break
         count = 0
     if count == len(stulist):
         print( "没有该学生学号！")

 def Del(stulist, ID): #删除一个学生信息
     count = 0
     for item in stulist:
         if item.ID == ID:
             stulist.remove(item)
             print( "删除成功！")
             break
         count +=1
     # if count == len(stulist):
     #   print( "没有该学生学号！"
     file_object = open("students.txt", "w")
     for stu in stulist:
         print( stu.ID, stu.name, stu.score1,stu.score2, stu.score3, stu.sum)
         file_object.write(stu.ID)
         file_object.write(" ")
         file_object.write(stu.name)
         file_object.write(" ")
         file_object.write(str(stu.score1))
         file_object.write(" ")
         file_object.write(str(stu.score2))
         file_object.write(" ")
         file_object.write(str(stu.score3))
         file_object.write(" ")
         file_object.write(str(stu.sum))
         file_object.write("\n")
         file_object.close()
     #   print( "保存成功！"
     file_object.close()
 def Change(stulist, ID):
     count = 0
     for item in stulist:
         if item.ID == ID:
             stulist.remove(item)
             file_object = open("students.txt", "w")
             for stu in stulist:
                 #print( li.ID, li.name, li.score
                 file_object.write(stu.ID)
                 file_object.write(" ")
                 file_object.write(stu.name)
                 file_object.write(" ")
                 file_object.write(str(stu.score1))
                 file_object.write(" ")
                 file_object.write(str(stu.score2))
                 file_object.write(" ")
                 file_object.write(str(stu.score3))
                 file_object.write(" ")
                 file_object.write(str(stu.sum))
                 file_object.write("\n")
             #   print( "保存成功！"
             file_object.close()
             stu = Student()
             stu.name = input("请输入学生的姓名")
             while True:
                 stu.ID = input("请输入学生的ID")
                 p = re.compile('^[0-9]{3}$')
                 if p.match(stu.ID):
                     break
                 else:
                     print( "输入的有错误！")
             while True:
                 stu.score1 = int(input("请输入学生语文成绩"))
                 if stu.score1 <= 100 and stu.score1 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             while True:
                 stu.score2 = int(input("请输入学生数学成绩"))
                 if stu.score2 <= 100 and stu.score2 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             while True:
                 stu.score3 = int(input("请输入学生英语成绩"))
                 if stu.score3 <= 100 and stu.score3 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             stu.sum = stu.score1 + stu.score2 + stu.score3
             Add(stulist,stu)
 def display(stulist): #显示所有学生信息
     print( u"学号   姓名    语文    数学    英语    总分")
     for item in stulist:
         print( item.ID, '\t' ,item.name,'\t', item.score1,'\t',item.score2, '\t', item.score3, '\t',item.sum)

 def Sort(stulist): #按学生成绩排序
     Stu = []
     sum_count = []
     for li in stulist:
         temp = []
         temp.append(li.ID)
         temp.append(li.name)
         temp.append(int(li.score1))
         temp.append(int(li.score2))
         temp.append(int(li.score3))
         temp.append(int(li.sum))
         sum_count.append(int(li.sum))
         Stu.append(temp)

     #print( sum_count
     #print( Stu;
     #print( stulist
     insertSort(sum_count, stulist)
     #print( stulist;
     display(stulist)

 def insertSort(a, stulist):
     for i in range(len(a)-1):
         #print( a,i
         for j in range(i+1,len(a)):
             if a[i]<a[j]:
                 temp = stulist[i]
                 stulist[i] = stulist[j]
                 stulist[j] = temp
     #return a

 def Init(stulist):  #初始化函数
     print( "初始化......")
     file_object = open('students.txt', 'r')
     for line in file_object:
         stu = Student()
         line = line.strip("\n")
         s = line.split(" ")
         stu.ID = s[0]
         stu.name = s[1]
         stu.score1 = s[2]
         stu.score2 = s[3]
         stu.score3 = s[4]
         stu.sum = s[5]
         stulist.append(stu)
     file_object.close()
     print( "初始化成功！")
     main()

 def main(): #主函数 该程序的入口函数
     while True:
         print( "*********************")
         print( u"--------菜单---------")
         print( u"增加学生信息--------1")
         print( u"查找学生信息--------2")
         print( u"删除学生信息--------3")
         print( u"修改学生信息--------4")
         print( u"所有学生信息--------5")
         print( u"按照分数排序--------6")
         print( u"退出程序------------0")
         print( "*********************")

         nChoose = input("请输入你的选择：")
         if nChoose == "":
             stu = Student()
             stu.name = input("请输入学生的姓名")
             while True:
                 stu.ID = input("请输入学生的ID")
                 p = re.compile('^[0-9]{3}$')
                 if p.match(stu.ID):
                     break
                 else:
                     print( "输入的有错误！")
             while True:
                 stu.score1 = int(input("请输入学生语文成绩"))
                 if stu.score1 <= 100 and stu.score1 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             while True:
                 stu.score2 = int(input("请输入学生数学成绩"))
                 if stu.score2 <= 100 and stu.score2 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             while True:
                 stu.score3 = int(input("请输入学生英语成绩"))
                 if stu.score3 <= 100 and stu.score3 > 0 :
                     break
                 else:
                     print( "输入的学生成绩有错误！")
             stu.sum = stu.score1 + stu.score2 + stu.score3
             Add(stulist,stu)

         if nChoose == '':
             ID = input("请输入学生的ID")
             Search(stulist, ID)

         if nChoose == '':
             ID = input("请输入学生的ID")
             Del(stulist, ID)
         if nChoose == '':
             ID = input("请输入学生的ID")
             Change(stulist, ID)

         if nChoose == '':
             display(stulist)

         if nChoose == '':
             Sort(stulist)

         if nChoose == '':
             break

 if __name__ == '__main__':
     stulist =[]
 Init(stulist)