因此，我试图从Gasbuddy.com上删除一些汽车信息，但是我在使用这些易破解的代码时遇到了一些麻烦。

这是我到目前为止所拥有的，请让我知道我做错了什么:

from scrapy.spider import BaseSpider
from scrapy.selector import HtmlXPathSelector
from scrapy.contrib.loader import XPathItemLoader
from scrapy.http import Request
from scrapy.http import FormRequest

class gasBuddy(BaseSpider):
name = "gasBuddy"
allowed_domains = ["http://www.gasbuddy.com"]
start_urls = [
    "http://www.gasbuddy.com/Trip_Calculator.aspx",
]

def parse(self, response):
    hxs = HtmlXPathSelector(response)
    #for years in hxs.select('//select[@id="ddlYear"]/option/text()'):
        #print years
    FormRequest(url="http://www.gasbuddy.com/Trip_Calculator.aspx",
                formdata={'Year': '%s'%("2011")},
                callback=self.make('2011'))


def make (years, self, response):
    #this is where we loop through all of the car makes and send the response to modle
    hxs = HtmlXPathSelector(response)
    for makes in hxs.select('//select[@id="ddlMake"]/option/text()').extract()
        FormRequest(url="http://www.gasbuddy.com/Trip_Calculator.aspx",
                formdata={'Year': '%s', 'Make': '%s'%(years, makes)},
                callback=self.model(years, makes))


def model (years, makes, self, response):
    #this is where we loop through all of the car modles and get all of the data assoceated with it.
    hxs = HtmlXPathSelector(response)
    for models in hxs.select('//select[@id="ddlModel"]/option/text()')
        FormRequest(url="http://www.gasbuddy.com/Trip_Calculator.aspx",
                formdata={'Year': '%s', 'Make': '%s', 'Model': '%s'%(years, makes, models)},
                callback=self.model(years, makes))

        print hxs.select('//td[@id="tdCityMpg"]/text()')

最佳答案

该答案仅涵盖使用附加参数调用回调的方法，而不能解决具体站点的动态表单问题。

要将其他参数传递给回调，可以使用标准Python库中的 functools.partial 。

没有Scrapy的简化示例:

import functools


def func(self, response):
    print self, response

def func_with_param(self, response, param):
    print self, response, param    

def caller(callback):
    callback('self', 'response')

caller(func)
caller(functools.partial(func_with_param, param='param'))

def make (self, response, years):
    ...

def model (self, response, years, makes):
    ...

import functools
...

def parse(self, response):
    ...
    return FormRequest(url="http://www.gasbuddy.com/Trip_Calculator.aspx",
                       formdata={'Year': '%s'%("2011")},
                       callback=functools.partial(self.make, years='2011'))

def parse(self, response):
    ...
    return FormRequest(url="http://www.gasbuddy.com/Trip_Calculator.aspx",
                       formdata={'Year': '%s'%("2011")},
                       meta={'years':'2011'},
                       callback=self.make)

def make (self, response):
    years = response.meta['years']
    ...

for something in hxs.select(...).extract():
    yield FormRequest(...)

https://stackoverflow.com/questions/8984816/