Python显示存在的字典的名称错误。

Question

在我的学校项目中，我制作了一个图书馆管理系统，在这个系统中，分配给学生的图书ID应该在另一本词典(Bkd)的钥匙中(它存储图书详细信息，钥匙是图书ID)。学生记录在文件library.dat中，图书记录在文件bookrec.dat中，学生记录以字典(Rec)形式存在，图书详细信息现在在字典(Bkd)中，当我试图使用if语句检查用户输入的图书id是否在bkd.keys()中时，程序会给出一个名称错误。有什么解决办法吗？

def crt_lib_rec():
    g=open('bookrec.dat','rb')
    f=open('library.dat','ab')
    rec={}
    rno=int(input('Enter Rno: '))
    nm=input('Enter name: ')
    gd=int(input("Enter the Grade of the student: "))
    div=input("Enter the Class of the student: ")
    bookid=int(input("Enter the Book ID: "))
    retdate=input("Enter the date of return: ")
    if bookid in bkd.keys():
        rec[rno]={'Name':nm,'Grade':gd,'Division':div,'Book ID':bookid,'Return Date':retdate}
        p.dump(rec,f)
        print("Record Created Successfully..")
    else:
        print("Enter a valid Book ID..")

字典bkd是在另一个函数crtbookrec()中创建的

下面是crtbookrec：

def crt_book_rec():
    g=open('bookrec.dat','ab')
    bkd={}
    bkid=int(input('Enter Book ID: '))
    bknme=input('Enter Book Name: ')
    authnme=input("Enter Author Name: ")
    bkd[bkid]={'Book Name':bknme,'Author Name':authnme}
    p.dump(bkd,g)
    g.close()

错误：

Traceback (most recent call last):
  File "C:\Users\kesha\Desktop\Project\Proj copy for testing\proj test.py", line 410, in <module>
    menufn()
  File "C:\Users\kesha\Desktop\Project\Proj copy for testing\proj test.py", line 350, in menufn
    crtlibrec()
  File "C:\Users\kesha\Desktop\Project\Proj copy for testing\proj test.py", line 19, in crtlibrec
    if bookid in bkd.keys():
NameError: name 'bkd' is not defined

调用函数的菜单：

def menufn():
    menu1='1.Student Details\n2.Book Details\n3.Exit'
    while True:
        print('='*90)
        print("\n\t\t\t    ABC Public School\n\n\t\t\t     Kottayam,Kerala\n\n\t\t\t    LIBRARY MANAGEMENT\n")
        print('='*90)
        print(menu1)
        print('='*90)
        opt1=input("Enter your choice(1/2/3): ")
        if opt1=='1':
            menu2='1.Create Student Record\n2.Display Student Records\n3.Modify Student Records\n4.Modify Book Issued\n5.Modify Return Date\n6.Search Student Records\n7.Delete Student Record\n8.Exit The Program'
            ch2='y'
            while True:
                print('='*90)
                print("\n\t\t\tSTUDENT DETAILS PROGRAM\n")
                print(menu2,"\n")
                print('='*90)
                opt2=input('Enter your choice: ')
                if opt2=='1':
                    #crtlibrec is called here
                    print('-'*10,'Creating Record','-'*10)
                    crt_lib_rec(bkd)
                elif opt2=='2':
                    print('-'*10,'Displaying Records','-'*10)
                    display_studet()
                elif opt2=='3':
                    print('-'*10,'Modifying Student Records','-'*10)
                    modify_stdet()
                elif opt2=='4':
                    print('-'*10,'Modifying Book Issued','-'*10)
                    modify_book_issd()
                elif opt2=='5':
                    print('-'*10,'Modifying Return Date','-'*10)
                    modify_ret_date()
                elif opt2=='6':
                    print('-'*10,'Searching Records','-'*10)
                    Search_stud()
                elif opt2=='7':
                    print('-'*10,'Deleting Student Record','-'*10)
                    Delete_std_rec()
                
                elif opt2=='8':
                    print('Exiting....')
                    break
                else:
                    print('Enter valid input')
                
        elif opt1=="2":
            menu3='1.Create Book Record\n2.Display Book Record\n3.Modify Book Records\n4.Search Book Records\n5.Delete Book Record\n6.Exit The Program'
            
            while True:
                print('='*90)
                print("\n\t\t\tBOOK DETAILS PROGRAM\n")
                print(menu3)
                print('='*90)
                opt3=input('Enter your choice: ')
                if opt3=='1':
                    #crtbookrec is called here
                    print('-'*10,'Creating Book Record','-'*10)
                    crt_book_rec()
                elif opt3=='2':
                    print('-'*10,'Displaying Book Records','-'*10)
                    display_book_rec()
                elif opt3=='3':
                    print('-'*10,'Modifying Book Records','-'*10)
                    modify_book_rec()
                elif opt3=='4':
                    print('-'*10,'Searching Book Records','-'*10)
                    search_book_rec()
                elif opt3=='5':
                    print('-'*10,'Deleting Book Record','-'*10)
                    delete_book_rec()
                elif opt3=='6':
                    print('Exiting....')
                    break
                else:
                    print('Enter valid input')
        elif opt1=="3":
            print("Thank You for using the Library Management Program")
            break
        else:
            print("Invalid Choice..")
menufn()

如果代码注释不好或者写得不好，我很抱歉，我对python很陌生

Answer 1

代码骨架应该如下所示

def crtlibrec(bkd):
    # do something with bkd

def crtbookrec():
  return bkd

def main():
  bkd = crtbookrec()
  crtlibrec(bkd)