Passing arguments to callback functions

[tarasm]

Hello,
I'm encountering a weird problem that I can't seem to overcome.

I'm trying to pass a variable to a callback function.

when I do

Request(url, callback=self.testfunction)

def testfunction(self, response):
// here i have access to the response

but if I try to pass an argument to testfunction in the following way:

Request(url, callback=self.testfunction(title))

def testfunction(self, test):
// I get the test argument, but I loose the response

What do I do?
Thank you,
Taras

[Patrick Mézard]

tarasm a écrit :

callback = lambda response: self.testfunction(response, test)
Request(url, callback=callback)

[...]

def testfunction(self, response, test):
pass

--
Patrick Mézard

[tarasm]

Hello Patrick,

That worked perfectly.
It would be great if this was in the documentation. It would have
saved me so much time.

Thank you again,
Taras

[Patrick Mézard]

tarasm a écrit :

> Hello Patrick,
>
> That worked perfectly.
> It would be great if this was in the documentation. It would have
> saved me so much time.

Well, this is a python question, completely unrelated to scrapy library.

http://www.faqts.com/knowledge_base/view.phtml/aid/6081/fid/241

--
Patrick Mézard

[tarasm]

Well,

I hope scrapy guys will take my suggestion under consideration,
considering that this directly applies to writing scrapy spiders.

Thank you Patrick,
Taras

[Pablo Hoffman]

Taras,

I've followed your suggestion and added documentation about passing
arguments to request callbacks (in r1005 & r1006).

Here's the link:
http://doc.scrapy.org/ref/request-response.html#passing-arguments-to-callback-functions

Regards,
Pablo.