Python while 循环语法错误

Question

我正在学习 Python，在处理一个简单的 while 循环时遇到语法错误，但无法弄清楚原因。下面是我的代码和我得到的错误

products = ['Product 1', 'Product 2', 'Product 3']
quote_items = []
quote = input("What services are you interesting in? (Press X to quit)")
while (quote.upper() != 'X'):
    product_found = products.get(quote)
    if product_found:
        quote_items.append(quote)
    else:
        print("No such product")
    quote = input("Anything Else?")
print(quote_items)

我正在使用 NetBeans 8.1 来运行这些。以下是我在输入产品 1 后看到的错误:

What servese are you interesting in? (Press X to quit)Product 1
Traceback (most recent call last):
File "\\NetBeansProjects\\while_loop.py", line 3, in <module>
quote = input("What services are you interesting in? (Press X to quit)")
File "<string>", line 1
Product 1
SyntaxError: no viable alternative at input '1'

Answer 1

在 Python 3

products = ['Product 1', 'Product 2', 'Product 3']
quote_items = []
quote = input("What services are you interesting in? (Press X to quit)")
while (quote.upper() != 'X'):
    product_found = quote in products
    if product_found:
        quote_items.append(quote)
    else:
        print("No such product")
    quote = input("Anything Else?")
print(quote_items)

在 Python 2

products = ['Product 1', 'Product 2', 'Product 3']
quote_items = []
quote = raw_input("What services are you interesting in? (Press X to quit)")
while (quote.upper() != 'X'):
    product_found = quote in products
    if product_found:
        quote_items.append(quote)
    else:
        print "No such product"
    quote = raw_input("Anything Else?")
print quote_items

这是因为列表没有属性 '.get()' 所以你可以使用

列表中的值 将返回一个 True 或 False 值