无法获得关键字python scrapy爬虫

Question

**keyword = ''

'''To obtain keyword'''
def test():`enter code here`
    keywords = list()
    while True:
        print('what do you want to do?(a: add a key word for searching, q:quit adding words and start)')
        command = input('command:')
        if command == 'a':
            word = input('keyword: ')
            if word not in keywords:
                keywords.append(word)
        elif command == 'q':
            break
        else:
            print('please input a valid command')
    if len(keywords) == 0:
        return
    search_string = ''
    for keyword in keywords:
        search_string += keyword
        search_string += '+'
    search_string = search_string[:-1]
    print(search_string)

    search_url = 'http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-' \
                 'bool.html&r=0&f=S&l=50&TERM1=' + search_string + '&FIELD1=&co1=AND&TERM2=&FIELD2=&d=PTXT'

    return search_url
'''Incoming url start the scrapy crawle'''
class Uspto(scrapy.Spider):
    name = 'uspto'
    #allowed_domains = ['http://patft.uspto.gov/']
    #start_url = 'http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=water&FIELD1=&co1=AND&TERM2=&FIELD2=&d=PTXT'

    allowed_domains = ["http://patft.uspto.gov"]
    keyword = test()

    start_urls = [
        #"http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=0&f=S&l=50&TERM1=python&FIELD1=&co1=AND&TERM2=&FIELD2=&d=PTXT",
        keyword,

    ]
**

在这里输入图像描述错误截图

从键盘输入关键字按关键字构造链接，然后启动爬虫，现在的问题是我访问关键字的方法有问题。

Answer 1

根据您的错误消息NameError: name 'a' is not defined，您似乎使用python 2而不是python 3，如果是，请使用raw_input()而不是input()。

command = raw_input("commands:")

raw_input()返回用户输入的字符串，您可以参考这个答案来了解有关input和raw_input的更多细节。