Python scrapy-未调用spider模块def函数

我的意图是调用start_requests方法来登录网站。登录后，刮网站。根据日志消息，我看到了 1.但是，我看到start_请求没有被调用。 2.parse的call_back函数也未调用

实际发生的是spider只是在开始URL中加载URL

问题:

为什么蜘蛛不在其他页面上爬行（比如第2、3、4页）

为什么从蜘蛛身上看是不起作用的

注:

我计算页码和url创建的方法是正确的。我核实过了

我引用此链接来编写此代码

我的代码：

zauba.py（蜘蛛）

loginform.py

#!/usr/bin/env python

import sys
from argparse import ArgumentParser
from collections import defaultdict
from lxml import html

__version__ = '1.0'  # also update setup.py


def _form_score(form):
    score = 0

    # In case of user/pass or user/pass/remember-me

    if len(form.inputs.keys()) in (2, 3):
        score += 10

    typecount = defaultdict(int)
    for x in form.inputs:
        type_ = (x.type if isinstance(x, html.InputElement) else 'other'
                 )
        typecount[type_] += 1

    if typecount['text'] > 1:
        score += 10
    if not typecount['text']:
        score -= 10

    if typecount['password'] == 1:
        score += 10
    if not typecount['password']:
        score -= 10

    if typecount['checkbox'] > 1:
        score -= 10
    if typecount['radio']:
        score -= 10

    return score


def _pick_form(forms):
    """Return the form most likely to be a login form"""

    return sorted(forms, key=_form_score, reverse=True)[0]


def _pick_fields(form):
    """Return the most likely field names for username and password"""

    userfield = passfield = emailfield = None
    for x in form.inputs:
        if not isinstance(x, html.InputElement):
            continue

        type_ = x.type
        if type_ == 'password' and passfield is None:
            passfield = x.name
        elif type_ == 'text' and userfield is None:
            userfield = x.name
        elif type_ == 'email' and emailfield is None:
            emailfield = x.name

    return (userfield or emailfield, passfield)


def submit_value(form):
    """Returns the value for the submit input, if any"""

    for x in form.inputs:
        if x.type == 'submit' and x.name:
            return [(x.name, x.value)]
    else:
        return []


def fill_login_form(
    url,
    body,
    username,
    password,
    ):
    doc = html.document_fromstring(body, base_url=url)
    form = _pick_form(doc.xpath('//form'))
    (userfield, passfield) = _pick_fields(form)
    form.fields[userfield] = username
    form.fields[passfield] = password
    form_values = form.form_values() + submit_value(form)
    return (form_values, form.action or form.base_url, form.method)


def main():
    ap = ArgumentParser()
    ap.add_argument('-u', '--username', default='username')
    ap.add_argument('-p', '--password', default='secret')
    ap.add_argument('url')
    args = ap.parse_args()

    try:
        import requests
    except ImportError:
        print 'requests library is required to use loginform as a tool'

    r = requests.get(args.url)
    (values, action, method) = fill_login_form(args.url, r.text,
            args.username, args.password)
    print '''url: {0}
method: {1}
payload:'''.format(action, method)
    for (k, v) in values:
        print '- {0}: {1}'.format(k, v)


if __name__ == '__main__':
    sys.exit(main())

日志消息：

2016-10-02 23:31:28 [scrapy] INFO: Scrapy 1.1.3 started (bot: scraptest)
2016-10-02 23:31:28 [scrapy] INFO: Overridden settings: {'NEWSPIDER_MODULE': 'scraptest.spiders', 'FEED_URI': 'medic.json', 'SPIDER_MODULES': ['scraptest.spiders'], 'BOT_NAME': 'scraptest', 'ROBOTSTXT_OBEY': True, 'USER_AGENT': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10.11; rv:39.0) Gecko/20100101 Firefox/39.0', 'FEED_FORMAT': 'json', 'AUTOTHROTTLE_ENABLED': True}
2016-10-02 23:31:28 [scrapy] INFO: Enabled extensions:
['scrapy.extensions.feedexport.FeedExporter',
 'scrapy.extensions.logstats.LogStats',
 'scrapy.extensions.telnet.TelnetConsole',
 'scrapy.extensions.corestats.CoreStats',
 'scrapy.extensions.throttle.AutoThrottle']
2016-10-02 23:31:28 [scrapy] INFO: Enabled downloader middlewares:
['scrapy.downloadermiddlewares.robotstxt.RobotsTxtMiddleware',
 'scrapy.downloadermiddlewares.httpauth.HttpAuthMiddleware',
 'scrapy.downloadermiddlewares.downloadtimeout.DownloadTimeoutMiddleware',
 'scrapy.downloadermiddlewares.useragent.UserAgentMiddleware',
 'scrapy.downloadermiddlewares.retry.RetryMiddleware',
 'scrapy.downloadermiddlewares.defaultheaders.DefaultHeadersMiddleware',
 'scrapy.downloadermiddlewares.redirect.MetaRefreshMiddleware',
 'scrapy.downloadermiddlewares.httpcompression.HttpCompressionMiddleware',
 'scrapy.downloadermiddlewares.redirect.RedirectMiddleware',
 'scrapy.downloadermiddlewares.cookies.CookiesMiddleware',
 'scrapy.downloadermiddlewares.chunked.ChunkedTransferMiddleware',
 'scrapy.downloadermiddlewares.stats.DownloaderStats']
2016-10-02 23:31:28 [scrapy] INFO: Enabled spider middlewares:
['scrapy.spidermiddlewares.httperror.HttpErrorMiddleware',
 'scrapy.spidermiddlewares.offsite.OffsiteMiddleware',
 'scrapy.spidermiddlewares.referer.RefererMiddleware',
 'scrapy.spidermiddlewares.urllength.UrlLengthMiddleware',
 'scrapy.spidermiddlewares.depth.DepthMiddleware']
2016-10-02 23:31:28 [scrapy] INFO: Enabled item pipelines:
[]
2016-10-02 23:31:28 [scrapy] INFO: Spider opened
2016-10-02 23:31:28 [scrapy] INFO: Crawled 0 pages (at 0 pages/min), scraped 0 items (at 0 items/min)
2016-10-02 23:31:28 [scrapy] DEBUG: Telnet console listening on 127.0.0.1:6024
2016-10-02 23:31:29 [scrapy] DEBUG: Crawled (200) <GET https://www.zauba.com/robots.txt> (referer: None)
2016-10-02 23:31:38 [scrapy] DEBUG: Crawled (200) <GET https://www.zauba.com/import-gold/p-1-hs-code.html> (referer: None)
2016-10-02 23:31:38 [scrapy] INFO: Closing spider (finished)
2016-10-02 23:31:38 [scrapy] INFO: Dumping Scrapy stats:
{'downloader/request_bytes': 558,
 'downloader/request_count': 2,
 'downloader/request_method_count/GET': 2,
 'downloader/response_bytes': 136267,
 'downloader/response_count': 2,
 'downloader/response_status_count/200': 2,
 'finish_reason': 'finished',
 'finish_time': datetime.datetime(2016, 10, 3, 6, 31, 38, 560012),
 'log_count/DEBUG': 3,
 'log_count/INFO': 7,
 'response_received_count': 2,
 'scheduler/dequeued': 1,
 'scheduler/dequeued/memory': 1,
 'scheduler/enqueued': 1,
 'scheduler/enqueued/memory': 1,
 'start_time': datetime.datetime(2016, 10, 3, 6, 31, 28, 927872)}
2016-10-02 23:31:38 [scrapy] INFO: Spider closed (finished)

2016-10-02 23:31:28[scrapy]信息：scrapy 1.1.3已启动（bot:scraptest）
2016-10-02 23:31:28[scrapy]信息：覆盖的设置：{'NEWSPIDER_MODULE'：'scraptest.SPIDER'，'FEED_URI'：'medic.json'，'SPIDER_MODULES'：['scraptest.SPIDER']，'BOT_NAME'：'scraptest'，'ROBOTSTXT_-obe'：True，'USER_-AGENT'：'Mozilla/5.0（麦金托什；英特尔Mac OS X 10.11；rv:39.0）Gecko/20100101 Firefox/39.0，“FEED_格式”：“json”，“AUTOTHROTTLE_启用”：True}
2016-10-02 23:31:28[scrapy]信息：启用的扩展：
['scrapy.extensions.feedexport.FeedExporter'，
'scrapy.extensions.logstats.logstats'，
'scrapy.extensions.telnet.TelnetConsole'，
'scrapy.extensions.corestats.corestats'，
'scrapy.extensions.throttle.AutoThrottle']
2016-10-02 23:31:28[scrapy]信息：已启用的下载程序中间件：
['scrapy.downloaderMiddleware.robotstxt.RobotsTxtMiddleware'，
'scrapy.downloaderMiddleware.httpauth.HttpAuthMiddleware'，
'scrapy.downloadermiddleware.downloadtimeout.DownloadTimeoutMiddleware'，
'scrapy.DownloaderMiddleware.useragent.UserAgentMiddleware'，
'scrapy.DownloaderMiddleware.retry.RetryMiddleware'，
'scrapy.downloaderMiddleware.defaultheaders.DefaultHeadersMiddleware'，
'scrapy.DownloaderMiddleware.redirect.MetaRefreshMiddleware'，
'scrapy.DownloaderMiddleware.httpcompression.HttpCompressionMiddleware'，
'scrapy.DownloaderMiddleware.redirect.RedirectMiddleware'，
“scrapy.DownloaderMiddleware.cookies.CookiesMiddleware”，
'scrapy.DownloaderMiddleware.chunked.ChunkedTransfererMiddleware'，
'scrapy.downloadermiddleware.stats.DownloaderStats']
2016-10-02 23:31:28[scrapy]信息：启用的蜘蛛中间件：
['scrapy.spidermiddleware.httperror.httperror中间件'，
'刮皮.SpiderMiddleware.场外.场外Iddleware'，
“scrapy.Spidermiddleware.referer.RefererMiddleware”，
'scrapy.spiderMiddleware.urllength.UrlLengthMiddleware'，
'scrapy.spidermiddleware.depth.DepthMiddleware']
2016-10-02 23:31:28[scrapy]信息：启用的项目管道：
[]
2016-10-02 23:31:28[剪贴]信息：蜘蛛打开
2016-10-02 23:31:28[抓取]信息：抓取0页（以0页/分钟的速度），抓取0项（以0项/分钟的速度）
2016-10-02 23:31:28[scrapy]调试：Telnet控制台监听127.0.0.1:6024
2016-10-02 23:31:29[scrapy]调试：爬网（200）（参考：无）
2016-10-02 23:31:38[scrapy]调试：爬网（200）（参考：无）
2016-10-02 23:31:38[scrapy]信息：关闭卡盘（已完成）
2016-10-02 23:31:38[scrapy]信息：倾销scrapy统计数据：
{'downloader/request_bytes'：558，
“下载程序/请求计数”：2，
“下载器/请求\方法\计数/获取”：2，
“downloader/response_字节”：136267，
“下载程序/响应计数”：2，
“下载程序/响应状态\计数/200”：2，
“完成原因”：“完成”，
“完成时间”：datetime.datetime（2016,10,3,6,31,38560012），
“日志计数/调试”：3，
“日志计数/信息”：7，
“响应\u已收到\u计数”：2，
“调度程序/出列”：1，
“调度程序/出列/内存”：1，
“调度程序/排队”：1，
“调度程序/排队/内存”：1，
“开始时间”：datetime.datetime（2016,10,3,6,31,28927872）}
2016-10-02 23:31:38[scrapy]信息：蜘蛛关闭（完成）

Scrapy已经有名为

FormRequest

的表单请求管理器

在大多数情况下，它会自己找到正确的形式。您可以尝试：

>>> scrapy shell "https://www.zauba.com/import-gold/p-1-hs-code.html"
from scrapy import FormRequest
login_data={'name':'mylogin', 'pass':'mypass'})
request = FormRequest.from_response(response, formdata=login_data)
print(request.body)
# b'form_build_id=form-Lf7bFJPTN57MZwoXykfyIV0q3wzZEQqtA5s6Ce-bl5Y&form_id=user_login_block&op=Log+in&pass=mypass&name=mylogin'

---

一旦您登录任何链接的请求，之后都会附加一个会话cookie，因此您只需在链接开始时登录一次。

我发现了我犯的错误

我没有将函数放在类中。这就是为什么。。。。事情没有如预期的那样顺利。现在，我在所有功能中添加了一个选项卡空间，一切都开始正常运行

---

感谢@user2989777和@Granitosaurus前来调试

您使用的是哪一个Scrapy版本？另外，请让我了解有关loginform文件的更多详细信息。我使用的是1.1版，或者它看起来像是函数调用链（启动请求->解析登录->启动爬网->解析->获取页码->提取条目）没有在这里发生。我从日志消息中观察到的是，只调用了start\u URL。是否仍要调试以查看函数调用链？我发现了我犯的错误！！！！

>>> scrapy shell "https://www.zauba.com/import-gold/p-1-hs-code.html"
from scrapy import FormRequest
login_data={'name':'mylogin', 'pass':'mypass'})
request = FormRequest.from_response(response, formdata=login_data)
print(request.body)
# b'form_build_id=form-Lf7bFJPTN57MZwoXykfyIV0q3wzZEQqtA5s6Ce-bl5Y&form_id=user_login_block&op=Log+in&pass=mypass&name=mylogin'