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import re
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import os
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filename = "students.txt"
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def menu():
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print('''
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╔———————学生信息管理系统————————╗
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│ │
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│ =============== 功能菜单 =============== │
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│ │
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│ 1 录入学生信息 │
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│ 2 查找学生信息 │
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│ 3 删除学生信息 │
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│ 4 修改学生信息 │
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│ 5 排序 │
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│ 6 统计学生总人数 │
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│ 7 显示所有学生信息 │
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│ 0 退出系统 │
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│ ========================================== │
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│ 说明：通过数字或↑↓方向键选择菜单 │
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╚———————————————————————╝
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''')
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def main():
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ctrl = True
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while (ctrl):
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menu()
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option = input("请选择：")
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option_str = re.sub("\D", "", option)
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if option_str in ['0', '1', '2', '3', '4', '5', '6', '7']:
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option_int = int(option_str)
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if option_int == 0:
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print('您已退出学生成绩管理系统！')
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ctrl = False
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elif option_int == 1:
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insert()
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elif option_int == 2:
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search()
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elif option_int == 3:
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delete()
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elif option_int == 4:
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modify()
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elif option_int == 5:
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sort()
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elif option_int == 6:
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total()
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elif option_int == 7:
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show()
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'''1 录入学生信息'''
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def insert():
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stdentList = []
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mark = True
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while mark:
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id = input("请输入ID（如 1001）：")
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if not id:
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break
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name = input("请输入名字：")
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if not name:
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break
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try:
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english = int(input("请输入英语成绩："))
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python = int(input("请输入Python成绩："))
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c = int(input("请输入C语言成绩："))
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except:
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print("输入无效，不是整型数值．．．．重新录入信息")
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continue
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stdent = {"id": id, "name": name, "english": english, "python": python, "c": c} # 将输入的学生信息保存到字典
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stdentList.append(stdent)
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inputMark = input("是否继续添加？（y/n）:")
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if inputMark == "y":
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mark = True
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else:
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mark = False
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save(stdentList)
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print("学生信息录入完毕！！！")
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def save(student):
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try:
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students_txt = open(filename, "a")
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except Exception as e:
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students_txt = open(filename, "w")
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for info in student:
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students_txt.write(str(info) + "\n")
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students_txt.close()
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'''2 查找学生成绩信息'''
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def search():
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mark = True
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student_query = []
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while mark:
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id = ""
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name = ""
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if os.path.exists(filename):
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mode = input("按ID查输入1；按姓名查输入2：")
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if mode == "1":
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id = input("请输入学生ID：")
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elif mode == "2":
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name = input("请输入学生姓名：")
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else:
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print("您的输入有误，请重新输入！")
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search()
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with open(filename, 'r') as file:
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student = file.readlines()
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for list in student:
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d = dict(eval(list))
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if id is not "":
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if d['id'] == id:
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student_query.append(d)
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elif name is not "":
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if d['name'] == name:
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student_query.append(d)
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show_student(student_query)
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student_query.clear()
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inputMark = input("是否继续查询？（y/n）:")
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if inputMark == "y":
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mark = True
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else:
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mark = False
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else:
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print("暂未保存数据信息...")
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return
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'''3 删除学生成绩信息'''
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def delete():
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mark = True
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while mark:
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studentId = input("请输入要删除的学生ID：")
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if studentId is not "":
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if os.path.exists(filename):
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with open(filename, 'r') as rfile:
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student_old = rfile.readlines()
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else:
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student_old = []
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ifdel = False
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if student_old:
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with open(filename, 'w') as wfile:
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d = {}
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for list in student_old:
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d = dict(eval(list))
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if d['id'] != studentId:
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wfile.write(str(d) + "\n")
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else:
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ifdel = True
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if ifdel:
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print("ID为 %s 的学生信息已经被删除..." % studentId)
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else:
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print("没有找到ID为 %s 的学生信息..." % studentId)
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else:
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print("无学生信息...")
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break
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show()
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inputMark = input("是否继续删除？（y/n）:")
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if inputMark == "y":
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mark = True
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else:
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mark = False
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'''4 修改学生成绩信息'''
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def modify():
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show()
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if os.path.exists(filename):
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with open(filename, 'r') as rfile:
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student_old = rfile.readlines()
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else:
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return
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studentid = input("请输入要修改的学生ID：")
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with open(filename, "w") as wfile:
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for student in student_old:
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d = dict(eval(student))
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if d["id"] == studentid:
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print("找到了这名学生，可以修改他的信息！")
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while True:
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try:
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d["name"] = input("请输入姓名：")
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d["english"] = int(input("请输入英语成绩："))
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d["python"] = int(input("请输入Python成绩："))
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d["c"] = int(input("请输入C语言成绩："))
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except:
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print("您的输入有误，请重新输入。")
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else:
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break
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student = str(d)
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wfile.write(student + "\n")
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print("修改成功！")
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else:
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wfile.write(student)
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mark = input("是否继续修改其他学生信息？（y/n）：")
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if mark == "y":
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modify()
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'''5 排序'''
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def sort():
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show()
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if os.path.exists(filename):
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with open(filename, 'r') as file:
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student_old = file.readlines()
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student_new = []
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for list in student_old:
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d = dict(eval(list))
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student_new.append(d)
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else:
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return
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ascORdesc = input("请选择（0升序；1降序）：")
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if ascORdesc == "0":
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ascORdescBool = False
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elif ascORdesc == "1":
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ascORdescBool = True
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else:
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print("您的输入有误，请重新输入！")
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sort()
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mode = input("请选择排序方式（1按英语成绩排序；2按Python成绩排序；3按C语言成绩排序；0按总成绩排序）：")
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if mode == "1":
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student_new.sort(key=lambda x: x["english"], reverse=ascORdescBool)
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elif mode == "2":
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student_new.sort(key=lambda x: x["python"], reverse=ascORdescBool)
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elif mode == "3":
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student_new.sort(key=lambda x: x["c"], reverse=ascORdescBool)
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elif mode == "0":
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student_new.sort(key=lambda x: x["english"] + x["python"] + x["c"], reverse=ascORdescBool)
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else:
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print("您的输入有误，请重新输入！")
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sort()
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show_student(student_new)
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''' 6 统计学生总数'''
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def total():
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if os.path.exists(filename):
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with open(filename, 'r') as rfile:
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student_old = rfile.readlines()
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if student_old:
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print("一共有 %d 名学生！" % len(student_old))
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else:
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print("还没有录入学生信息！")
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else:
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print("暂未保存数据信息...")
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''' 7 显示所有学生信息 '''
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def show():
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student_new = []
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if os.path.exists(filename):
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with open(filename, 'r') as rfile:
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student_old = rfile.readlines()
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for list in student_old:
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student_new.append(eval(list))
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if student_new:
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show_student(student_new)
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else:
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print("暂未保存数据信息...")
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def show_student(studentList):
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if not studentList:
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print("(o@.@o) 无数据信息 (o@.@o) \n")
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return
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format_title = "{:^6}{:^12}\t{:^8}\t{:^10}\t{:^10}\t{:^10}"
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print(format_title.format("ID", "名字", "英语成绩", "Python成绩", "C语言成绩", "总成绩"))
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format_data = "{:^6}{:^12}\t{:^12}\t{:^12}\t{:^12}\t{:^12}"
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for info in studentList:
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print(format_data.format(info.get("id"), info.get("name"), str(info.get("english")), str(info.get("python")),
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str(info.get("c")),
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str(info.get("english") + info.get("python") + info.get("c")).center(12)))
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if __name__ == "__main__":
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main()
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