python - python3上的简单书店程序

Question

我正在学习 Python，并尝试使用函数和用户输入编写一个简单的书店程序。它需要参数(书籍、价格)并打印“订单:'您的书籍选择'成本'x美元'”但我无法让它工作。你能检查一下我的代码并帮助我吗？

def book_store(book,price):
    book_choice = input("Enter books title: ")
    book_price = input ("Enter books price: ")

    return "Title: " + book_choice + ", costs " + book_price

print (book_store(book_choice, book_price))

NameError Traceback (most recent call last) in () 10 11 ---> 12 print (book_store(book_choice, book_price))

NameError: name 'book_choice' is not defined

Answer 1

您正在传递两个未使用的参数，并且无论如何都不会初始化它们。他们是多余的。作品如下:

def book_store():
    book_choice = input("Enter books title: ")
    book_price = input ("Enter books price: ")

    return "Title: " + book_choice + ", costs " + book_price


print (book_store())

给予:

Enter books title: Good Python
Enter books price: 2.30
Title: Good Python, costs 2.30