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May 12, 2023 am 09:43 AM
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import os
filename='students.txt'
def main():
    while True:
        menum()
        choice=int(input('請選擇功能:'))
        if choice in [0,1,2,3,4,5,6,7]:
            if choice==0:
                answer=input('您確定要退出系統(tǒng)嗎?(y/n)')
                if answer=='y' or answer=='Y':
                    print('感謝您的使用!')
                    break #退出while循環(huán)并退出系統(tǒng)
                else:
                    continue
            elif choice == 1:
                insert() #錄入學(xué)生信息
            elif choice == 2:
                search() #查找學(xué)生信息
            elif choice == 3:
                delete() #刪除學(xué)生信息
            elif choice == 4:
                modify() #修改學(xué)生信息
            elif choice == 5:
                sort() #成績排序
            elif choice == 6:
                total() #統(tǒng)計學(xué)生總?cè)藬?shù)
            elif choice == 7:
                show() #顯示所有學(xué)生信息
 
def insert():
    student_list=[] #用于存儲學(xué)生信息,列表每個元素是字典。
    while True:
        id=input('請輸入學(xué)生ID:')
        if not id:
            break
        name=input('請輸入學(xué)生姓名:')
        if not name:
            break
        try:
            Englist=int(input('請輸入英語成績:'))
            Python=int(input('請輸入Python成績:'))
            Java=int(input('請輸入Java成績:'))
        except:
            print('輸入無效,不是整數(shù)類型,請重新輸入!')
            continue
        #將錄入的學(xué)生信息保存到字典中
        student={'id':id,'name':name,'English':Englist,'Python':Python,'Java':Java}
        #將學(xué)生信息添加到列表中
        student_list.append(student)
        answer=input('是否繼續(xù)添加?(y/n)')
        if answer=='y' or answer=='Y':
            continue
        else:
            break
 
    #將學(xué)生信息保存在文件中
    save(student_list)
    print('學(xué)生信息錄入完畢!')
    pass
 
def search():
    student_query=[] #用列表存儲,防止有同名學(xué)生。
    while True:
        id=''
        name=''
        if os.path.exists(filename):
            mode=input('按ID查找請輸入1,按姓名查找請輸入2:')
            if mode == '1':
                id=input('請輸入要查找的學(xué)生ID:')
            elif mode == '2':
                name=input('請輸入要查找的學(xué)生姓名:')
            else:
                print('您的輸入有誤,請重新輸入!')
                search()
            with open(filename,'r',encoding='utf-8') as rfile:
                student=rfile.readlines()
                for item in student:
                    d=dict(eval(item))
                    if id!='':
                        if d['id']==id:
                            student_query.append(d)
                    elif name!='':
                        if d['name']==name:
                            student_query.append(d)
            #顯示查詢結(jié)果
            show_student(student_query)
            student_query.clear() #清空列表
            answer=input('是否要繼續(xù)查詢?(y/n)')
            if answer=='y' or answer=='Y':
                continue
            else:
                break
        else:
            print('暫未保存學(xué)生信息。')
            return
    pass
 
def delete():
    while True:
        student_id=input('請輸入要刪除的學(xué)生ID:')
        if student_id != '':
            if os.path.exists(filename): #判斷文件是否存在
                with open(filename,'r',encoding='utf-8') as file:
                    student_old=file.readlines() #讀取所有學(xué)生信息并保存在列表中
            else:
                student_old=[]
            flag=False #用于標(biāo)記是否刪除
            if student_old:
                with open(filename,'w',encoding='utf-8') as wfile:
                    d={}
                    for item in student_old: #遍歷學(xué)生信息列表
                        d=dict(eval(item)) #將字符串轉(zhuǎn)成字典
                        if d['id']!=student_id:
                            wfile.write(str(d)+'\n')
                        else:
                            flag=True
                    if flag:
                        print(f'id為{student_id}的學(xué)生信息已被刪除')
                    else:
                        print(f'沒有找到ID為{student_id}的學(xué)生信息')
            else:
                print('無此學(xué)生信息')
                break
            show() #刪完之后重新顯示所有學(xué)生信息
            answer=input('是否繼續(xù)刪除?(y/n)')
            if answer=='y' or answer=='Y':
                continue
            else:
                break
    pass
 
def modify():
    show()
    if os.path.exists(filename): #判斷文件是否存在
        with open(filename,'r',encoding='utf-8') as rfile:
            student_old=rfile.readlines()
    else:
        return #結(jié)束函數(shù)
    student_id=input('請輸入要修改信息的學(xué)生ID:')
    with open(filename,'w',encoding='utf-8') as wfile:
        for item in student_old:
            d=dict(eval(item))
            if d['id']==student_id:
                print('找到此學(xué)生信息,可以修改。')
                while True:
                    try:
                        d['name']=input('請輸入學(xué)生姓名:')
                        d['English']=input('請輸入English成績:')
                        d['Python']=input('請輸入Python成績:')
                        d['Java']=input('請輸入Java成績:')
                    except:
                        print('您的輸入有誤請重新輸入!')
                    else:
                        break
                wfile.write(str(d)+'\n')
                print('修改成功!')
            else:
                wfile.write(str(d)+'\n')
        answer=input('是否繼續(xù)修改其他學(xué)生信息?(y/n)')
        if answer=='y':
            modify()
    pass
 
def sort():
    show()
    if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as rfile:
            student_list=rfile.readlines()
        student_new=[]
        for item in student_list:
            d=dict(eval(item))
            student_new.append(d)
    else:
        return
    asc_or_desc=input('請選擇(0:升序,1:降序):')
    if asc_or_desc=='0':
        asc_or_desc_bool=False
    elif asc_or_desc=='1':
        asc_or_desc_bool=True
    else:
        print('您的輸入有誤,請重新輸入!')
        sort()
    mode=input('請選擇排序方式(0:按總成績排序,1:按English成績排序,2:按Python成績排序,3:按Java成績排序)')
    if mode=='0':
        student_new.sort(key=lambda x: int(x['English'])+int(x['Python'])+int(x['Java']), reverse=asc_or_desc_bool)
    elif mode=='1':
        student_new.sort(key=lambda x:int(x['English']),reverse=asc_or_desc_bool)
    elif mode=='2':
        student_new.sort(key=lambda x: int(x['Python']), reverse=asc_or_desc_bool)
    elif mode=='3':
        student_new.sort(key=lambda x: int(x['Java']), reverse=asc_or_desc_bool)
    else:
        print('您的輸入有誤,請重新輸入!')
        sort()
    show_student(student_new)
    pass
 
def total():
    if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as rfile:
            students=rfile.readlines()
            if students:
                print(f'一共有{len(students)}名學(xué)生')
            else:
                print('還沒有錄入學(xué)生信息!')
    else:
        print('暫未保存學(xué)生信息......')
    pass
 
def show():
    student_lst=[]
    if os.path.exists(filename):
        with open(filename,'r',encoding='utf-8') as rfile:
            students=rfile.readlines()
            for item in students:
                student_lst.append(eval(item))
            if student_lst:
                show_student(student_lst)
    else:
        print('暫未保存過數(shù)據(jù)!')
    pass
 
def save(stu_list):
    try:
        stu_txt=open(filename,'a',encoding='utf=8')
    except:
        stu_txt=open(filename,'w',encoding='utf-8')
    for item in stu_list:
        stu_txt.write(str(item)+'\n')
    stu_txt.close()
 
def show_student(lst):
    if len(lst)==0:
        print('沒有查到學(xué)生信息,無數(shù)據(jù)顯示!')
        return
    #定義標(biāo)題顯示格式
    format_title='{:^6}\t{:^12}\t{:^10}\t{:^10}\t{:^10}\t{:^8}'
    print(format_title.format('ID','姓名','English成績','Python成績','Java成績','總成績'))
    #定義內(nèi)容顯示格式
    format_data='{:^6}\t{:^12}\t{:^10}\t{:^18}\t{:^14}\t{:^8}'
    for item in lst:
        print(format_data.format(item.get('id'),item.get('name'),item.get('English'),item.get('Python'),item.get('Java'),str(int(item.get('English'))+int(item.get('Python'))+int(item.get('Java')))))
    pass
 
def menum():
    print('-------------------學(xué)生信息管理系統(tǒng)--------------------')
    print('-----------------------功能菜單------------------------')
    print('                    1.錄入學(xué)生信息')
    print('                    2.查找學(xué)生信息')
    print('                    3.刪除學(xué)生信息')
    print('                    4.修改學(xué)生信息')
    print('                    5.成績排序')
    print('                    6.統(tǒng)計學(xué)生總?cè)藬?shù)')
    print('                    7.顯示所有學(xué)生信息')
    print('                    0.退出系統(tǒng)')
    print('------------------------------------------------------')
 
main()

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