python实现简单的学生成绩管理系统

本文实例为大家分享了python实现学生成绩管理系统的具体代码，供大家参考，具体内容如下

需求：

代码：

import os
filename = 'student.txt'

def main():
  while True:
    menu()
    choice = int(www.cppcns.cominput("请选择："))
    if choice in [0,1,2,3,4,5,6,7]:
      if choice==0:
        answer = input("你确定要退出吗？y/n")
        if answer =='y' or answer =='Y':
          print("谢谢使用！")
          break
        else:
          continue
      elif choice ==1:
        insert()
      elif choice ==2:
        search()
      elif choice ==3:
        delete()
      elif choice ==4:
        modify()
      elif choice ==5:
        sort()
      elif choice ==6:
        total()
      else:
        show()
# 菜单
def menu():
  print("====================学生成绩管理系统=========================")
  print("======================功能菜单==============================")
  print("\t\t1、录入学生信息")
  print("\t\t2、查找学生信息")
  print("\t\t3、删除学生信息")
  print("\t\t4、修改学生信息")
  print("\t\t5、排序")
  print("\t\t6、统计学生人数")
  print("\t\t7、显示所有学生信息")
  print("\t\t0、退出系统")
  print("--------------------------------------------------------------")
# 插入
def insert():
  student_list=[]
  while True:
    id = input('请输入ID(如1001):')
    if not id:
      break
    name = input('请输入姓名：')
    if not name:
      break

    try:
      english=int(input("input english grade："))
      python=int(input("input python grade："))
      java=int(input("input java grade："))
    except:
      print("输入成绩无效！重新输入！")
      continue

    student = {'id':id,'name':name,'english':english,'python':python,'java':java}
    student_list.append(student)
    answer = input("是否继续添加信息！？：'y/n'")
    if answer == 'y':
      continue
    else:
      break

  # 调用save函数将其保存在文本当中
  save(student_list)
  print("学生信息录入成功！")
# 保存
def save(lst):
  try:
    stu_txt = open(filename,'a',encoding='utf-8')
  except:
    stu_txt = open(filename,'w',encoding='utf-8')
 
  for item in lst:
    stu_txt.write(str(item)+'\n')
  stu_txt.close()
# 搜索
def search():
  while True:
    student_name = input("请输入你要查找的学生姓名：")
    if student_name:
      if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as rfile:
          student_old = rfile.readlines()
      else:
        student_old = []

      if student_old:
        d = {}
        flag = False
        for item in student_old:
          d = dict(eval(item))
          if d['name'] == student_name:
            flag = True
            student_show(d)
          else:
            pass
      www.cppcns.com   
      else:
        print("无学生信息，请添加！")
      if flag:
        print("查询成功")
      else:
        print("查询失败")
    else:
      print("没有输入学生姓名！")
   
    answer = input("请问是否继续查询：y/n")
    if answer == "y":
      continue
    else:
      break
# 展示个人信息
def student_show(dic):
  format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
  print(format_title.format('ID','姓名','英语成绩','python成绩','java成绩','总成绩'))

  format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
  print(format_data.format(dic.get('id'),
              dic.get('name'),
              dic.get('english'),
              dic.get('python'),
              dic.get('java'),
              int(dic.get('english'))+int(dic.get('python'))+int(dic.get('java')),
              ))
# 删除
def delete():
  while True:
    student_id = input("请输入要删除的学生ID：")
    if student_id:
      if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as file:
          student_old = file.readlines()
      else:
        student_old=[]
      flag = False
      if student_old:
        with open(filename,'w',encoding='utf-8') as wfile:
          d={}
          for item in student_old:
            d = dict(eval(item))
            if d['id']!=student_id:
              wfile.write(str(d)+"\n")
            else:
              flag = True
          if flag:
            print(f"{student_id}已经被删除！")
          else:
            print(f"{student_id}没有找到!")
      else:
        print("无学生信息！")
        break

  http://www.cppcns.com    show()
      answer = input("是否继续删除？y/n")
      if answer == 'y':
        continue
      else:
        break
    else:
      print("请输入要删除的ID：")
      continue
# 修改   
def modify():
  while True:
    student_id = input("请输入要修改的学生ID：")
    if student_id:
      if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as file:
          student_old = file.readlines()
      else:
        student_old=[]
      if student_old:
        with open(filename,'w',encoding='utf-8') as wfile:
          d = {}
          for item in student_old:
            d = dict(eval(item))
            if d['id'] == student_id:
              answer = input('已经找到该学生信息，是否修改：y/n？')
              flag = False
              if answer:
                d['name']=input("姓名：")
                d['english']=int(input("english："))
                d['python']=int(input("python："))
                d['java']=int(input("java："))
                wfile.write(str(d)+"\n")
                flag = True
              else:
                wfile.write(str(d)+"\n")
                break
            else:
              wfile.write(str(d)+"\n")
          if flag:
            print("修改成功！")
          else:
            print("修改失败！")
      else:
        print("无学生信息，请添加")
      answer = input("请问是否继续修改？y/n")
      if answer == "y":
        continue
      else:
        break
    else:
      print("输入错误！")
# 排序     
def sort():
  while True:
    if os.path.exists(filename):
      with open(filename,'r',encoding='utf-8') as file:
        student_old = file.readlines()
      student_new = []
      d={}
      for item in student_old:
        d=dict(eval(item))
        student_new.append(d)
      asc_and_desc = int(input("怎么排序:0 升序 1 降序："))
      choice = int(input("按照什么排序:1 english 2 python 3 java 0 总成绩："))
      if choice == 1:
        student_new.sort(key=l编程客栈ambda x:int(x['english']),reverse=asc_and_desc)
      elif choice == 2:
        student_new.sort(key=lambda x:int(x['python']),reverse=asc_and_desc)
      elif choice == 3: 
        student_new.sort(key=lambda x:int(x['java']),reverse=asc_and_desc)
      elif choice == 0:
        student_new.sort(key=lambda x:int(x['english'])+int(x['python'])+int(x['java']),reverse=asc_and_desc)
      else:
        print("输入有误")
        sort()
    else:
      print("无学生信息")
    format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
    print(format_title.format('ID','姓名'http://www.cppcns.com,'英语成绩','python成绩','java成绩','总成绩'))

    format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
    for dic in student_new:
      print(format_data.format(dic.get('id'),
                  dic.get('name'),
                  dic.get('english'),
                  dic.get('python'),
                  dic.get('java'),
                  int(dic.get('english'))+int(dic.get('python'))+int(dic.get('java')),
                  ))
    answer = input("请问是否继续排序？y/n")
    if answer == "y":
      continue
    else:
      break
# 总人数
def total():
  if os.path.exists(filename):
    with open(filename,'r',encoding='utf-8') as file:
      student_old = file.readlines()
    print('一共有',len(student_old),'名学生！')
  else:
    print("无人员资料")
  import msvcrt
  msvcrt.getch()
# 展示
def show():
  if os.path.exists(filename):
    with open(filename,'r',encoding='utf-8') as file:
      student_old = file.readlines()
    d = {}
    students = []
    for item in student_old:
      d = dict(eval(item))
      students.append(d)
  else:
    print("没有信息！")
  if len(students):
    format_title = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
    print(format_title.format('ID','姓名','英语成绩','python成绩','java成绩','总成绩'))

    format_data = '{:^6}\t{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^8}'
    for dic in students:
      print(format_data.format(dic.get('id'),
                  dic.get('name'),
                  dic.get('english'),
                  dic.get('python'),
                  dic.get('java'),
                  int(dic.get('english'))+int(dic.get('python'))+int(dic.get('java')),
                  ))
  else:
    print("无人员信息！")
  import msvcrt
  msvcrt.getch()

if __name__ == '__main__':
  main()

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