Если утверждения с неопределенной переменной

Question

Я не уверен, что я делаю неправильно. Я попытался определить «если ответ был 'Y' Затем premium_membership=true», но я продолжаю получать эту ошибку. Начало до тех пор, пока я запускаю код, а второй - мой код.

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

В этом разделе кода

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.") 

вы присваиваете premium_member=True в том случае, membership равно 'Y', но в том случае, если это не очень (else филиал) вы вообще не присваиваете значения, то есть переменная будет неопределенной. Вы должны добавить строку premium_member=False в ветку else.

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.")