How to yield several requests in order in Scrapy?











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I need to send my requests in order with Scrapy.



def n1(self, response) :

    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    for (elem,) in self.input :



        link =  urljoin(path,elem)



        yield Request(link)


My problem is that the requests are not in the order.
I read this question but it has no correct answer.



How should I change my code for sending the requests in order?



UPDATE 1



I used priority and changed my code to 



def n1(self, response) :



    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    self.prio = len(self.input)

    for (elem,) in self.input :

        self.prio -= 1

        link =  urljoin(path,elem)



        yield Request(link, priority=self.prio)


And my setting for this spider is 



custom_settings = {

    'DOWNLOAD_DELAY' : 0,

    'COOKIES_ENABLED' : True,

    'CONCURRENT_REQUESTS' : 1 ,

    'AUTOTHROTTLE_ENABLED' : False,

}


Now the order is changed, but it's not in the order of elements in the array






scrapy python-requests yield







share|improve this question
























  • Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
    – vezunchik
    Nov 16 at 11:01










  • @ElenaSh. Thanks, I tried your suggestion, and updated my question
    – parik
    Nov 16 at 11:27















up vote
0
down vote

favorite
1












I need to send my requests in order with Scrapy.



def n1(self, response) :

    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    for (elem,) in self.input :



        link =  urljoin(path,elem)



        yield Request(link)


My problem is that the requests are not in the order.
I read this question but it has no correct answer.



How should I change my code for sending the requests in order?



UPDATE 1



I used priority and changed my code to 



def n1(self, response) :



    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    self.prio = len(self.input)

    for (elem,) in self.input :

        self.prio -= 1

        link =  urljoin(path,elem)



        yield Request(link, priority=self.prio)


And my setting for this spider is 



custom_settings = {

    'DOWNLOAD_DELAY' : 0,

    'COOKIES_ENABLED' : True,

    'CONCURRENT_REQUESTS' : 1 ,

    'AUTOTHROTTLE_ENABLED' : False,

}


Now the order is changed, but it's not in the order of elements in the array






scrapy python-requests yield







share|improve this question
























  • Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
    – vezunchik
    Nov 16 at 11:01










  • @ElenaSh. Thanks, I tried your suggestion, and updated my question
    – parik
    Nov 16 at 11:27













up vote
0
down vote

favorite
1









up vote
0
down vote

favorite
1






1





I need to send my requests in order with Scrapy.



def n1(self, response) :

    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    for (elem,) in self.input :



        link =  urljoin(path,elem)



        yield Request(link)


My problem is that the requests are not in the order.
I read this question but it has no correct answer.



How should I change my code for sending the requests in order?



UPDATE 1



I used priority and changed my code to 



def n1(self, response) :



    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    self.prio = len(self.input)

    for (elem,) in self.input :

        self.prio -= 1

        link =  urljoin(path,elem)



        yield Request(link, priority=self.prio)


And my setting for this spider is 



custom_settings = {

    'DOWNLOAD_DELAY' : 0,

    'COOKIES_ENABLED' : True,

    'CONCURRENT_REQUESTS' : 1 ,

    'AUTOTHROTTLE_ENABLED' : False,

}


Now the order is changed, but it's not in the order of elements in the array






scrapy python-requests yield







share|improve this question















I need to send my requests in order with Scrapy.



def n1(self, response) :

    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    for (elem,) in self.input :



        link =  urljoin(path,elem)



        yield Request(link)


My problem is that the requests are not in the order.
I read this question but it has no correct answer.



How should I change my code for sending the requests in order?



UPDATE 1



I used priority and changed my code to 



def n1(self, response) :



    #self.input = [elem1,elem2,elem3,elem4,elem5, .... ,elem100000]

    self.prio = len(self.input)

    for (elem,) in self.input :

        self.prio -= 1

        link =  urljoin(path,elem)



        yield Request(link, priority=self.prio)


And my setting for this spider is 



custom_settings = {

    'DOWNLOAD_DELAY' : 0,

    'COOKIES_ENABLED' : True,

    'CONCURRENT_REQUESTS' : 1 ,

    'AUTOTHROTTLE_ENABLED' : False,

}


Now the order is changed, but it's not in the order of elements in the array






scrapy python-requests yield




scrapy python-requests yield






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited Nov 19 at 20:56

























asked Nov 16 at 10:50









parik

32162048




32162048












  • Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
    – vezunchik
    Nov 16 at 11:01










  • @ElenaSh. Thanks, I tried your suggestion, and updated my question
    – parik
    Nov 16 at 11:27


















  • Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
    – vezunchik
    Nov 16 at 11:01










  • @ElenaSh. Thanks, I tried your suggestion, and updated my question
    – parik
    Nov 16 at 11:27
















Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
– vezunchik
Nov 16 at 11:01




Try to check priority in Request: doc.scrapy.org/en/latest/topics/request-response.html
– vezunchik
Nov 16 at 11:01












@ElenaSh. Thanks, I tried your suggestion, and updated my question
– parik
Nov 16 at 11:27




@ElenaSh. Thanks, I tried your suggestion, and updated my question
– parik
Nov 16 at 11:27












3 Answers
3






active

oldest

votes

















up vote
1
down vote



accepted










Use a return statement instead of yield.



You don't even need to touch any setting:



from scrapy.spiders import Spider, Request



class MySpider(Spider):



    name = 'toscrape.com'

    start_urls = ['http://books.toscrape.com/catalogue/page-1.html']



    urls = (

        'http://books.toscrape.com/catalogue/page-{}.html'.format(i + 1) for i in range(50)

    )



    def parse(self, response):

        for url in self.urls:

            return Request(url)


Output:



2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-1.html> (referer: http://books.toscrape.com/catalogue/page-1.html)

2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-2.html> (referer: http://books.toscrape.com/catalogue/page-1.html)

2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-3.html> (referer: http://books.toscrape.com/catalogue/page-2.html)

2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-4.html> (referer: http://books.toscrape.com/catalogue/page-3.html)

2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-5.html> (referer: http://books.toscrape.com/catalogue/page-4.html)

2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-6.html> (referer: http://books.toscrape.com/catalogue/page-5.html)

2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-7.html> (referer: http://books.toscrape.com/catalogue/page-6.html)

2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-8.html> (referer: http://books.toscrape.com/catalogue/page-7.html)

2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-9.html> (referer: http://books.toscrape.com/catalogue/page-8.html)

2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-10.html> (referer: http://books.toscrape.com/catalogue/page-9.html)

2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-11.html> (referer: http://books.toscrape.com/catalogue/page-10.html)

2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-12.html> (referer: http://books.toscrape.com/catalogue/page-11.html)

2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-13.html> (referer: http://books.toscrape.com/catalogue/page-12.html)

2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-14.html> (referer: http://books.toscrape.com/catalogue/page-13.html)

2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-15.html> (referer: http://books.toscrape.com/catalogue/page-14.html)

2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-16.html> (referer: http://books.toscrape.com/catalogue/page-15.html)

2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-17.html> (referer: http://books.toscrape.com/catalogue/page-16.html)

2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-18.html> (referer: http://books.toscrape.com/catalogue/page-17.html)

2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-19.html> (referer: http://books.toscrape.com/catalogue/page-18.html)

2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-20.html> (referer: http://books.toscrape.com/catalogue/page-19.html)

2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-21.html> (referer: http://books.toscrape.com/catalogue/page-20.html)

2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-22.html> (referer: http://books.toscrape.com/catalogue/page-21.html)

2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-23.html> (referer: http://books.toscrape.com/catalogue/page-22.html)

2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-24.html> (referer: http://books.toscrape.com/catalogue/page-23.html)

2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-25.html> (referer: http://books.toscrape.com/catalogue/page-24.html)


With a yield statement, the engine gets all the responses from the generator and executes them in an arbitrary order (I suspect they might be stored in some sort of set to remove duplicates).






share|improve this answer




























    up vote
    0
    down vote













    I think concurrent request is play at here. You can try setting 



    custom_settings = {
    
    'CONCURRENT_REQUESTS': 1
    
}


    Default setting is 8. It will kind of explain why priority will not honoured when you have other workers free for work.






    share|improve this answer





















    • I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
      – parik
      Nov 17 at 17:54


















    up vote
    0
    down vote













    You can send the next request only after receiving the previous one:



    class MainSpider(Spider):
    
    urls = [
    
        'https://www.url1...',
    
        'https://www.url2...',
    
        'https://www.url3...',
    
    ]
    

    
    def start_requests(self):
    
        yield Request(
    
            url=self.urls[0],
    
            callback=self.parse,
    
            meta={'next_index': 1},
    
        )
    

    
    def parse(self, response):
    
        next_index = response.meta['next_index']
    

    
        # do something with response...
    

    
        # Process next url
    
        if next_index < len(self.urls):
    
            yield Request(
    
                url=self.urls[next_index],
    
                callback=self.parse,
    
                meta={'next_index': next_index+1},
    
            )





    share|improve this answer





















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      3 Answers
      3






      active

      oldest

      votes








      3 Answers
      3






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes








      up vote
      1
      down vote



      accepted










      Use a return statement instead of yield.



      You don't even need to touch any setting:



      from scrapy.spiders import Spider, Request
      

      
class MySpider(Spider):
      

      
    name = 'toscrape.com'
      
    start_urls = ['http://books.toscrape.com/catalogue/page-1.html']
      

      
    urls = (
      
        'http://books.toscrape.com/catalogue/page-{}.html'.format(i + 1) for i in range(50)
      
    )
      

      
    def parse(self, response):
      
        for url in self.urls:
      
            return Request(url)


      Output:



      2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-1.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
      
2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-2.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
      
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-3.html> (referer: http://books.toscrape.com/catalogue/page-2.html)
      
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-4.html> (referer: http://books.toscrape.com/catalogue/page-3.html)
      
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-5.html> (referer: http://books.toscrape.com/catalogue/page-4.html)
      
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-6.html> (referer: http://books.toscrape.com/catalogue/page-5.html)
      
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-7.html> (referer: http://books.toscrape.com/catalogue/page-6.html)
      
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-8.html> (referer: http://books.toscrape.com/catalogue/page-7.html)
      
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-9.html> (referer: http://books.toscrape.com/catalogue/page-8.html)
      
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-10.html> (referer: http://books.toscrape.com/catalogue/page-9.html)
      
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-11.html> (referer: http://books.toscrape.com/catalogue/page-10.html)
      
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-12.html> (referer: http://books.toscrape.com/catalogue/page-11.html)
      
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-13.html> (referer: http://books.toscrape.com/catalogue/page-12.html)
      
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-14.html> (referer: http://books.toscrape.com/catalogue/page-13.html)
      
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-15.html> (referer: http://books.toscrape.com/catalogue/page-14.html)
      
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-16.html> (referer: http://books.toscrape.com/catalogue/page-15.html)
      
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-17.html> (referer: http://books.toscrape.com/catalogue/page-16.html)
      
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-18.html> (referer: http://books.toscrape.com/catalogue/page-17.html)
      
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-19.html> (referer: http://books.toscrape.com/catalogue/page-18.html)
      
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-20.html> (referer: http://books.toscrape.com/catalogue/page-19.html)
      
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-21.html> (referer: http://books.toscrape.com/catalogue/page-20.html)
      
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-22.html> (referer: http://books.toscrape.com/catalogue/page-21.html)
      
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-23.html> (referer: http://books.toscrape.com/catalogue/page-22.html)
      
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-24.html> (referer: http://books.toscrape.com/catalogue/page-23.html)
      
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-25.html> (referer: http://books.toscrape.com/catalogue/page-24.html)


      With a yield statement, the engine gets all the responses from the generator and executes them in an arbitrary order (I suspect they might be stored in some sort of set to remove duplicates).






      share|improve this answer

























        up vote
        1
        down vote



        accepted










        Use a return statement instead of yield.



        You don't even need to touch any setting:



        from scrapy.spiders import Spider, Request
        

        
class MySpider(Spider):
        

        
    name = 'toscrape.com'
        
    start_urls = ['http://books.toscrape.com/catalogue/page-1.html']
        

        
    urls = (
        
        'http://books.toscrape.com/catalogue/page-{}.html'.format(i + 1) for i in range(50)
        
    )
        

        
    def parse(self, response):
        
        for url in self.urls:
        
            return Request(url)


        Output:



        2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-1.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
        
2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-2.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
        
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-3.html> (referer: http://books.toscrape.com/catalogue/page-2.html)
        
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-4.html> (referer: http://books.toscrape.com/catalogue/page-3.html)
        
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-5.html> (referer: http://books.toscrape.com/catalogue/page-4.html)
        
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-6.html> (referer: http://books.toscrape.com/catalogue/page-5.html)
        
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-7.html> (referer: http://books.toscrape.com/catalogue/page-6.html)
        
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-8.html> (referer: http://books.toscrape.com/catalogue/page-7.html)
        
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-9.html> (referer: http://books.toscrape.com/catalogue/page-8.html)
        
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-10.html> (referer: http://books.toscrape.com/catalogue/page-9.html)
        
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-11.html> (referer: http://books.toscrape.com/catalogue/page-10.html)
        
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-12.html> (referer: http://books.toscrape.com/catalogue/page-11.html)
        
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-13.html> (referer: http://books.toscrape.com/catalogue/page-12.html)
        
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-14.html> (referer: http://books.toscrape.com/catalogue/page-13.html)
        
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-15.html> (referer: http://books.toscrape.com/catalogue/page-14.html)
        
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-16.html> (referer: http://books.toscrape.com/catalogue/page-15.html)
        
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-17.html> (referer: http://books.toscrape.com/catalogue/page-16.html)
        
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-18.html> (referer: http://books.toscrape.com/catalogue/page-17.html)
        
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-19.html> (referer: http://books.toscrape.com/catalogue/page-18.html)
        
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-20.html> (referer: http://books.toscrape.com/catalogue/page-19.html)
        
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-21.html> (referer: http://books.toscrape.com/catalogue/page-20.html)
        
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-22.html> (referer: http://books.toscrape.com/catalogue/page-21.html)
        
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-23.html> (referer: http://books.toscrape.com/catalogue/page-22.html)
        
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-24.html> (referer: http://books.toscrape.com/catalogue/page-23.html)
        
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-25.html> (referer: http://books.toscrape.com/catalogue/page-24.html)


        With a yield statement, the engine gets all the responses from the generator and executes them in an arbitrary order (I suspect they might be stored in some sort of set to remove duplicates).






        share|improve this answer























          up vote
          1
          down vote



          accepted







          up vote
          1
          down vote



          accepted






          Use a return statement instead of yield.



          You don't even need to touch any setting:



          from scrapy.spiders import Spider, Request
          

          
class MySpider(Spider):
          

          
    name = 'toscrape.com'
          
    start_urls = ['http://books.toscrape.com/catalogue/page-1.html']
          

          
    urls = (
          
        'http://books.toscrape.com/catalogue/page-{}.html'.format(i + 1) for i in range(50)
          
    )
          

          
    def parse(self, response):
          
        for url in self.urls:
          
            return Request(url)


          Output:



          2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-1.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
          
2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-2.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
          
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-3.html> (referer: http://books.toscrape.com/catalogue/page-2.html)
          
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-4.html> (referer: http://books.toscrape.com/catalogue/page-3.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-5.html> (referer: http://books.toscrape.com/catalogue/page-4.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-6.html> (referer: http://books.toscrape.com/catalogue/page-5.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-7.html> (referer: http://books.toscrape.com/catalogue/page-6.html)
          
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-8.html> (referer: http://books.toscrape.com/catalogue/page-7.html)
          
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-9.html> (referer: http://books.toscrape.com/catalogue/page-8.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-10.html> (referer: http://books.toscrape.com/catalogue/page-9.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-11.html> (referer: http://books.toscrape.com/catalogue/page-10.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-12.html> (referer: http://books.toscrape.com/catalogue/page-11.html)
          
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-13.html> (referer: http://books.toscrape.com/catalogue/page-12.html)
          
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-14.html> (referer: http://books.toscrape.com/catalogue/page-13.html)
          
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-15.html> (referer: http://books.toscrape.com/catalogue/page-14.html)
          
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-16.html> (referer: http://books.toscrape.com/catalogue/page-15.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-17.html> (referer: http://books.toscrape.com/catalogue/page-16.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-18.html> (referer: http://books.toscrape.com/catalogue/page-17.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-19.html> (referer: http://books.toscrape.com/catalogue/page-18.html)
          
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-20.html> (referer: http://books.toscrape.com/catalogue/page-19.html)
          
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-21.html> (referer: http://books.toscrape.com/catalogue/page-20.html)
          
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-22.html> (referer: http://books.toscrape.com/catalogue/page-21.html)
          
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-23.html> (referer: http://books.toscrape.com/catalogue/page-22.html)
          
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-24.html> (referer: http://books.toscrape.com/catalogue/page-23.html)
          
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-25.html> (referer: http://books.toscrape.com/catalogue/page-24.html)


          With a yield statement, the engine gets all the responses from the generator and executes them in an arbitrary order (I suspect they might be stored in some sort of set to remove duplicates).






          share|improve this answer












          Use a return statement instead of yield.



          You don't even need to touch any setting:



          from scrapy.spiders import Spider, Request
          

          
class MySpider(Spider):
          

          
    name = 'toscrape.com'
          
    start_urls = ['http://books.toscrape.com/catalogue/page-1.html']
          

          
    urls = (
          
        'http://books.toscrape.com/catalogue/page-{}.html'.format(i + 1) for i in range(50)
          
    )
          

          
    def parse(self, response):
          
        for url in self.urls:
          
            return Request(url)


          Output:



          2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-1.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
          
2018-11-20 03:35:43 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-2.html> (referer: http://books.toscrape.com/catalogue/page-1.html)
          
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-3.html> (referer: http://books.toscrape.com/catalogue/page-2.html)
          
2018-11-20 03:35:44 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-4.html> (referer: http://books.toscrape.com/catalogue/page-3.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-5.html> (referer: http://books.toscrape.com/catalogue/page-4.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-6.html> (referer: http://books.toscrape.com/catalogue/page-5.html)
          
2018-11-20 03:35:45 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-7.html> (referer: http://books.toscrape.com/catalogue/page-6.html)
          
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-8.html> (referer: http://books.toscrape.com/catalogue/page-7.html)
          
2018-11-20 03:35:46 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-9.html> (referer: http://books.toscrape.com/catalogue/page-8.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-10.html> (referer: http://books.toscrape.com/catalogue/page-9.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-11.html> (referer: http://books.toscrape.com/catalogue/page-10.html)
          
2018-11-20 03:35:47 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-12.html> (referer: http://books.toscrape.com/catalogue/page-11.html)
          
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-13.html> (referer: http://books.toscrape.com/catalogue/page-12.html)
          
2018-11-20 03:35:48 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-14.html> (referer: http://books.toscrape.com/catalogue/page-13.html)
          
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-15.html> (referer: http://books.toscrape.com/catalogue/page-14.html)
          
2018-11-20 03:35:49 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-16.html> (referer: http://books.toscrape.com/catalogue/page-15.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-17.html> (referer: http://books.toscrape.com/catalogue/page-16.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-18.html> (referer: http://books.toscrape.com/catalogue/page-17.html)
          
2018-11-20 03:35:50 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-19.html> (referer: http://books.toscrape.com/catalogue/page-18.html)
          
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-20.html> (referer: http://books.toscrape.com/catalogue/page-19.html)
          
2018-11-20 03:35:51 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-21.html> (referer: http://books.toscrape.com/catalogue/page-20.html)
          
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-22.html> (referer: http://books.toscrape.com/catalogue/page-21.html)
          
2018-11-20 03:35:52 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-23.html> (referer: http://books.toscrape.com/catalogue/page-22.html)
          
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-24.html> (referer: http://books.toscrape.com/catalogue/page-23.html)
          
2018-11-20 03:35:53 [scrapy.core.engine] DEBUG: Crawled (200) <GET http://books.toscrape.com/catalogue/page-25.html> (referer: http://books.toscrape.com/catalogue/page-24.html)


          With a yield statement, the engine gets all the responses from the generator and executes them in an arbitrary order (I suspect they might be stored in some sort of set to remove duplicates).







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 20 at 16:56









          Guillaume

          1,0951724




          1,0951724
























              up vote
              0
              down vote













              I think concurrent request is play at here. You can try setting 



              custom_settings = {
              
    'CONCURRENT_REQUESTS': 1
              
}


              Default setting is 8. It will kind of explain why priority will not honoured when you have other workers free for work.






              share|improve this answer





















              • I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
                – parik
                Nov 17 at 17:54















              up vote
              0
              down vote













              I think concurrent request is play at here. You can try setting 



              custom_settings = {
              
    'CONCURRENT_REQUESTS': 1
              
}


              Default setting is 8. It will kind of explain why priority will not honoured when you have other workers free for work.






              share|improve this answer





















              • I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
                – parik
                Nov 17 at 17:54













              up vote
              0
              down vote










              up vote
              0
              down vote









              I think concurrent request is play at here. You can try setting 



              custom_settings = {
              
    'CONCURRENT_REQUESTS': 1
              
}


              Default setting is 8. It will kind of explain why priority will not honoured when you have other workers free for work.






              share|improve this answer












              I think concurrent request is play at here. You can try setting 



              custom_settings = {
              
    'CONCURRENT_REQUESTS': 1
              
}


              Default setting is 8. It will kind of explain why priority will not honoured when you have other workers free for work.







              share|improve this answer












              share|improve this answer



              share|improve this answer










              answered Nov 17 at 7:18









              Biswanath

              5,136103756




              5,136103756












              • I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
                – parik
                Nov 17 at 17:54


















              • I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
                – parik
                Nov 17 at 17:54
















              I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
              – parik
              Nov 17 at 17:54




              I have 'CONCURRENT_REQUESTS' : 1 ,'AUTOTHROTTLE_ENABLED' : False, in my settings
              – parik
              Nov 17 at 17:54










              up vote
              0
              down vote













              You can send the next request only after receiving the previous one:



              class MainSpider(Spider):
              
    urls = [
              
        'https://www.url1...',
              
        'https://www.url2...',
              
        'https://www.url3...',
              
    ]
              

              
    def start_requests(self):
              
        yield Request(
              
            url=self.urls[0],
              
            callback=self.parse,
              
            meta={'next_index': 1},
              
        )
              

              
    def parse(self, response):
              
        next_index = response.meta['next_index']
              

              
        # do something with response...
              

              
        # Process next url
              
        if next_index < len(self.urls):
              
            yield Request(
              
                url=self.urls[next_index],
              
                callback=self.parse,
              
                meta={'next_index': next_index+1},
              
            )





              share|improve this answer

























                up vote
                0
                down vote













                You can send the next request only after receiving the previous one:



                class MainSpider(Spider):
                
    urls = [
                
        'https://www.url1...',
                
        'https://www.url2...',
                
        'https://www.url3...',
                
    ]
                

                
    def start_requests(self):
                
        yield Request(
                
            url=self.urls[0],
                
            callback=self.parse,
                
            meta={'next_index': 1},
                
        )
                

                
    def parse(self, response):
                
        next_index = response.meta['next_index']
                

                
        # do something with response...
                

                
        # Process next url
                
        if next_index < len(self.urls):
                
            yield Request(
                
                url=self.urls[next_index],
                
                callback=self.parse,
                
                meta={'next_index': next_index+1},
                
            )





                share|improve this answer























                  up vote
                  0
                  down vote










                  up vote
                  0
                  down vote









                  You can send the next request only after receiving the previous one:



                  class MainSpider(Spider):
                  
    urls = [
                  
        'https://www.url1...',
                  
        'https://www.url2...',
                  
        'https://www.url3...',
                  
    ]
                  

                  
    def start_requests(self):
                  
        yield Request(
                  
            url=self.urls[0],
                  
            callback=self.parse,
                  
            meta={'next_index': 1},
                  
        )
                  

                  
    def parse(self, response):
                  
        next_index = response.meta['next_index']
                  

                  
        # do something with response...
                  

                  
        # Process next url
                  
        if next_index < len(self.urls):
                  
            yield Request(
                  
                url=self.urls[next_index],
                  
                callback=self.parse,
                  
                meta={'next_index': next_index+1},
                  
            )





                  share|improve this answer












                  You can send the next request only after receiving the previous one:



                  class MainSpider(Spider):
                  
    urls = [
                  
        'https://www.url1...',
                  
        'https://www.url2...',
                  
        'https://www.url3...',
                  
    ]
                  

                  
    def start_requests(self):
                  
        yield Request(
                  
            url=self.urls[0],
                  
            callback=self.parse,
                  
            meta={'next_index': 1},
                  
        )
                  

                  
    def parse(self, response):
                  
        next_index = response.meta['next_index']
                  

                  
        # do something with response...
                  

                  
        # Process next url
                  
        if next_index < len(self.urls):
                  
            yield Request(
                  
                url=self.urls[next_index],
                  
                callback=self.parse,
                  
                meta={'next_index': next_index+1},
                  
            )






                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Nov 20 at 1:07









                  nicolas

                  1,436813




                  1,436813






























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