Question

我不确定我做错了什么我试图定义＆＃34;如果答案是'Y'那么premium_membership=true＆＃34;但我一直收到这个错误。当我运行代码时，开头就是我得到的，第二个是我的代码。

What is your name? John Smith 
How many books are you purchasing today? 5
Are you apart of our membership program? Enter Y for yes or N for No. N
Would you like to join our membership program for $4.95? Enter Y for yes or N for no. N
Thank you for your interest, and thanks for shopping with us!

John Smith 
The customer is purchasing 5.0 books
Traceback (most recent call last):
    File , line 41, in <module>
    if premium_member==True:
    NameError: name 'premium_member' is not defined
>>>

#ask what customer's name is
customer_name=input("What is your name?")

#ask customer how many books they are purchasing
#define answer as float so you can multiply by price later
books_purchased=float(input("How many books are you purchasing today?"))

#ask customer if they are a member
membership=input("Are you apart of our membership program? Enter Y for yes or N for No.")

#determine if and print if member or not
if membership =='Y':
    premium_member=True
else:
    join=input("Would you like to join our membership program for $4.95? Enter Y for yes or N for no.")

#define join
if join =='Y':
    print("Thank you for joining our Membership Program!")

else:
    print("Thank you for your interest, and thanks for shopping with us!")

#print name
print("\n",customer_name)

#print number of books purchased
print("The customer is purchasing", books_purchased, "books")

#determine if they customer is premium 
if premium_member==True:
    print("Premium Member")
else:
    print("Regular Member")       

#determine if customer gets any free books
if premium_member==True:
    if book_purchased>9:
        print("Congratulations you get two books for free!")
        total_books=book_purchased+2
    else:
        if book_purchased >6 and book_purchased<=9:
            print("Congratulations you get one book for free!")
            total_books=books_purchased+1
        else:
            total_books=books_purchased
else:
    if books_purchased>12:
            print("Congratulations you get two books for free!")
            total_books=book_purchased+2
    else:
        if books_purchased >8 and books_purchased <=12:
            print("Congratulations you get one book for free!")
            total_books=book_purchased+1
        else:
            total_books=books_purchased

Answer 1

在这段代码中

if membership =='Y':
    premium_member=True
else:
    join=input("Would you like to join our membership program for $4.95? Enter Y for yes or N for no.")

您在premium_member=True等于membership的情况下分配'Y'但在不是else分支的情况下分配premium_member=False ）你根本没有赋值，这意味着变量将是未定义的。您应该将行else添加到if membership =='Y': premium_member=True else: premium_member=False join=input("Would you like to join our membership program for $4.95? Enter Y for yes or N for no.")分支。

MessageBox

如果语句带有未定义的变量

1 个答案: