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Algorithm for web crawler in Scala


Algorithm for web crawler in Scala

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Algorithm for web crawler in Scala
Tag : algorithm , By : Anonymous
Date : January 12 2021, 08:33 AM

it should still fix some issue You've explicitly set the return type to Any. Update it to be List[String] Reduce the scope of your exception handling to only include the code which may throw an exception. Using a for comprehension should facilitate this. Also for simplicity, consider just returning a List rather than an Option[List] using List[String].empty. Two potential options: Mix-in your conn instance via a trait which will allow you to override the value or change your function to take an implicit conn which your unit tests can then mock.
Edit
case class Crawler() {
  def getConnection(url: String) = Jsoup.connect(url)

  def getLinksPage(urlToCrawl: String): Option[List[String]] = {
    val conn = getConnection(urlToCrawl)

    ...
  }
}

class CrawerSpec extends WordSpec with MockFactory {

  trait LinksFixture {

    val connection = mock[Connection]
    val getConnection = mockFunction[String, Connection]

    lazy val crawler = new Crawler() {
      override def getConnection(url: String) = LinksFixture.this.getConnection(url)
    }
  }

  trait LoopFixture {

    val getLinksPage = mock[String, Option[List[String]]]

    lazy val crawler = new Crawler() {
      override def getLinksPage(url: String) = LoopFixture.this.getLinksPage(url)
    }
  }

  "getLinksPage" should {

    "return the links" in new LinksFixture {

      val url = "http://bad-wolf"

      getConnection expects(url) returning connection
      // add other expects on connection

      crawler.getLinksPage(url) shouldBe expected // define expected
    }
  }

  "loop" should {

    "loop over the links" in new LoopFixture {

      getLinksPage expects(*) onCall {
        _ match {
          case "a" => Some(List("b","c"))
          case "b" => Some(List("d"))
          case _ => None
        }
      }
      // add any other expects

      crawler.loop(Some(List("a")), List.empty[String]) shouldBe // define expected
    }
  }
}

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Asp.net Request.Browser.Crawler - Dynamic Crawler List?


Tag : chash , By : user178372
Date : March 29 2020, 07:55 AM
will be helpful for those in need I've been happy the the results supplied by Ocean's Browsercaps. It supports crawlers that Microsoft's config files has not bothered detecting. It will even parse out what version of the crawler is on your site, not that I really need that level of detail.

Python Crawler - need help with my algorithm


Tag : python , By : damomurf
Date : March 29 2020, 07:55 AM
wish help you to fix your issue ** Added a summary of the problem at the end of the post ** , I think I've got it.
First, the code based on your idea:
import time

lastResult = 100

def checkNextID(ID, lastResult = lastResult, diff = [8,18,7,17,6,16,5,15]):
    runs = 0
    SEEN = set()

    while True:
        if ID>lastResult:
            print ('\n=========================='
                   '\nID==%s'
                   '\n   ID>lastResult is %s : program STOPS')\
                  % (ID,ID>lastResult,)
            break
        runs += 1
        if runs % 10 == 0:  time.sleep(0.5)
        if ID in SEEN:
            print '-----------------\nID=='+str(ID)+'  already seen, not examined'
            ID += 1
        else:
            curRes = isValid(ID)
            if curRes:
                print '--------------------------\nID=='+str(ID)+'  vaaaalid'
                while True:
                    for i in diff:
                        runs += 1
                        if runs % 10 == 0:  time.sleep(0.5)
                        curRes = isValid(ID+i)
                        SEEN.add(ID+i)
                        if curRes:
                            print '   i==%2s   ID+i==%s   valid' % (i,ID+i)
                            ID += i
                            print '--------------------------\nID==%s' % str(ID)
                            break
                        else:
                            print '   i==%2s   ID+i==%s   not valid' % (i,ID+i)
                    else:
                        ID += 1
                        break
            else:
                print '--------------------------\nID==%s  not valid' % ID
                ID += 1


def isValid(ID, valid_ones = (1,9,17,25,50,52,60,83,97,98)):
    return ID in valid_ones


checkNextID(0)
--------------------------
ID==0  not valid
--------------------------
ID==1  vaaaalid
   i== 8   ID+i==9   valid
--------------------------
ID==9
   i== 8   ID+i==17   valid
--------------------------
ID==17
   i== 8   ID+i==25   valid
--------------------------
ID==25
   i== 8   ID+i==33   not valid
   i==18   ID+i==43   not valid
   i== 7   ID+i==32   not valid
   i==17   ID+i==42   not valid
   i== 6   ID+i==31   not valid
   i==16   ID+i==41   not valid
   i== 5   ID+i==30   not valid
   i==15   ID+i==40   not valid
--------------------------
ID==26  not valid
--------------------------
ID==27  not valid
--------------------------
ID==28  not valid
--------------------------
ID==29  not valid
-----------------
ID==30  already seen, not examined
-----------------
ID==31  already seen, not examined
-----------------
ID==32  already seen, not examined
-----------------
ID==33  already seen, not examined
--------------------------
ID==34  not valid
--------------------------
ID==35  not valid
--------------------------
ID==36  not valid
--------------------------
ID==37  not valid
--------------------------
ID==38  not valid
--------------------------
ID==39  not valid
-----------------
ID==40  already seen, not examined
-----------------
ID==41  already seen, not examined
-----------------
ID==42  already seen, not examined
-----------------
ID==43  already seen, not examined
--------------------------
ID==44  not valid
--------------------------
ID==45  not valid
--------------------------
ID==46  not valid
--------------------------
ID==47  not valid
--------------------------
ID==48  not valid
--------------------------
ID==49  not valid
--------------------------
ID==50  vaaaalid
   i== 8   ID+i==58   not valid
   i==18   ID+i==68   not valid
   i== 7   ID+i==57   not valid
   i==17   ID+i==67   not valid
   i== 6   ID+i==56   not valid
   i==16   ID+i==66   not valid
   i== 5   ID+i==55   not valid
   i==15   ID+i==65   not valid
--------------------------
ID==51  not valid
--------------------------
ID==52  vaaaalid
   i== 8   ID+i==60   valid
--------------------------
ID==60
   i== 8   ID+i==68   not valid
   i==18   ID+i==78   not valid
   i== 7   ID+i==67   not valid
   i==17   ID+i==77   not valid
   i== 6   ID+i==66   not valid
   i==16   ID+i==76   not valid
   i== 5   ID+i==65   not valid
   i==15   ID+i==75   not valid
--------------------------
ID==61  not valid
--------------------------
ID==62  not valid
--------------------------
ID==63  not valid
--------------------------
ID==64  not valid
-----------------
ID==65  already seen, not examined
-----------------
ID==66  already seen, not examined
-----------------
ID==67  already seen, not examined
-----------------
ID==68  already seen, not examined
--------------------------
ID==69  not valid
--------------------------
ID==70  not valid
--------------------------
ID==71  not valid
--------------------------
ID==72  not valid
--------------------------
ID==73  not valid
--------------------------
ID==74  not valid
-----------------
ID==75  already seen, not examined
-----------------
ID==76  already seen, not examined
-----------------
ID==77  already seen, not examined
-----------------
ID==78  already seen, not examined
--------------------------
ID==79  not valid
--------------------------
ID==80  not valid
--------------------------
ID==81  not valid
--------------------------
ID==82  not valid
--------------------------
ID==83  vaaaalid
   i== 8   ID+i==91   not valid
   i==18   ID+i==101   not valid
   i== 7   ID+i==90   not valid
   i==17   ID+i==100   not valid
   i== 6   ID+i==89   not valid
   i==16   ID+i==99   not valid
   i== 5   ID+i==88   not valid
   i==15   ID+i==98   valid
--------------------------
ID==98
   i== 8   ID+i==106   not valid
   i==18   ID+i==116   not valid
   i== 7   ID+i==105   not valid
   i==17   ID+i==115   not valid
   i== 6   ID+i==104   not valid
   i==16   ID+i==114   not valid
   i== 5   ID+i==103   not valid
   i==15   ID+i==113   not valid
-----------------
ID==99  already seen, not examined
-----------------
ID==100  already seen, not examined

==========================
ID==101
   ID>lastResult is True : program STOPS
import time

lastResult = 100

def checkNextID(ID, lastResult = lastResult, diff = [8,18,7,17,6,16,5,15]):
    runs = 0
    maxdiff = max(diff)
    others = [x for x in xrange(1,maxdiff) if x not in diff]
    lastothers = others[-1]
    SEEN = set()

    while True:
        if ID>lastResult:
            print ('\n=========================='
                   '\nID==%s'
                   '\n   ID>lastResult is %s : program STOPS')\
                  % (ID,ID>lastResult,)
            break
        runs += 1
        if runs % 10 == 0:  time.sleep(0.5)
        if ID in SEEN:
            print '-----------------\nID=='+str(ID)+'  already seen, not examined'
            ID += 1
        else:
            curRes = isValid(ID)
            if curRes:
                print '------------------------------------\nID=='+str(ID)+'  vaaaalid'
                while True:
                    for i in diff:
                        runs += 1
                        if runs % 10 == 0:  time.sleep(0.5)
                        curRes = isValid(ID+i)
                        SEEN.add(ID+i)
                        if curRes:
                            print '   i==%2s   ID+i==%s   valid' % (i,ID+i)
                            ID += i
                            print '--------------------------\nID==%s' % str(ID)
                            break
                        else:
                            print '   i==%2s   ID+i==%s   not valid' % (i,ID+i)
                    else:
                        for j in others:
                            if ID+j>lastResult:
                                print '\n   j==%2s   %s+%s==%s>lastResult==%s is %s' \
                                      % (j,ID,j,ID+j,lastResult,ID+j>lastResult)
                                ID += j
                                print '\n--------------------------\nnow ID==',ID
                                break
                            runs += 1
                            if runs % 10 == 0:  time.sleep(0.5)
                            curRes = isValid(ID+j)
                            SEEN.add(ID+j)
                            if curRes:
                                print '   j==%2s   ID+j==%s   valid' % (j,ID+j)
                                ID += j
                                print '--------------------------\nID=='+str(ID)
                                break
                            else:
                                print '   j==%2s   ID+j==%s   not valid' % (j,ID+j)

                        if j==lastothers:
                            ID += maxdiff + 1
                            print '   ID += %s + 1 ==> ID==%s' % (maxdiff,ID)
                            break
                        elif ID>lastResult:
                            print '   ID>lastResult==%s>%s is %s ==> WILL STOP' % (ID,lastResult,ID>lastResult)
                            break

            else:
                print '-------------------------\nID=='+str(ID)+'  not valid'
                ID += 1




def isValid(ID, valid_ones = (1,9,17,25,50,52,60,83,97,98)):
    return ID in valid_ones


checkNextID(0)
-------------------------
ID==0  not valid
------------------------------------
ID==1  vaaaalid
   i== 8   ID+i==9   valid
--------------------------
ID==9
   i== 8   ID+i==17   valid
--------------------------
ID==17
   i== 8   ID+i==25   valid
--------------------------
ID==25
   i== 8   ID+i==33   not valid
   i==18   ID+i==43   not valid
   i== 7   ID+i==32   not valid
   i==17   ID+i==42   not valid
   i== 6   ID+i==31   not valid
   i==16   ID+i==41   not valid
   i== 5   ID+i==30   not valid
   i==15   ID+i==40   not valid
   j== 1   ID+j==26   not valid
   j== 2   ID+j==27   not valid
   j== 3   ID+j==28   not valid
   j== 4   ID+j==29   not valid
   j== 9   ID+j==34   not valid
   j==10   ID+j==35   not valid
   j==11   ID+j==36   not valid
   j==12   ID+j==37   not valid
   j==13   ID+j==38   not valid
   j==14   ID+j==39   not valid
   ID += 18 + 1 ==> ID==44
-------------------------
ID==44  not valid
-------------------------
ID==45  not valid
-------------------------
ID==46  not valid
-------------------------
ID==47  not valid
-------------------------
ID==48  not valid
-------------------------
ID==49  not valid
------------------------------------
ID==50  vaaaalid
   i== 8   ID+i==58   not valid
   i==18   ID+i==68   not valid
   i== 7   ID+i==57   not valid
   i==17   ID+i==67   not valid
   i== 6   ID+i==56   not valid
   i==16   ID+i==66   not valid
   i== 5   ID+i==55   not valid
   i==15   ID+i==65   not valid
   j== 1   ID+j==51   not valid
   j== 2   ID+j==52   valid
--------------------------
ID==52
   i== 8   ID+i==60   valid
--------------------------
ID==60
   i== 8   ID+i==68   not valid
   i==18   ID+i==78   not valid
   i== 7   ID+i==67   not valid
   i==17   ID+i==77   not valid
   i== 6   ID+i==66   not valid
   i==16   ID+i==76   not valid
   i== 5   ID+i==65   not valid
   i==15   ID+i==75   not valid
   j== 1   ID+j==61   not valid
   j== 2   ID+j==62   not valid
   j== 3   ID+j==63   not valid
   j== 4   ID+j==64   not valid
   j== 9   ID+j==69   not valid
   j==10   ID+j==70   not valid
   j==11   ID+j==71   not valid
   j==12   ID+j==72   not valid
   j==13   ID+j==73   not valid
   j==14   ID+j==74   not valid
   ID += 18 + 1 ==> ID==79
-------------------------
ID==79  not valid
-------------------------
ID==80  not valid
-------------------------
ID==81  not valid
-------------------------
ID==82  not valid
------------------------------------
ID==83  vaaaalid
   i== 8   ID+i==91   not valid
   i==18   ID+i==101   not valid
   i== 7   ID+i==90   not valid
   i==17   ID+i==100   not valid
   i== 6   ID+i==89   not valid
   i==16   ID+i==99   not valid
   i== 5   ID+i==88   not valid
   i==15   ID+i==98   valid
--------------------------
ID==98
   i== 8   ID+i==106   not valid
   i==18   ID+i==116   not valid
   i== 7   ID+i==105   not valid
   i==17   ID+i==115   not valid
   i== 6   ID+i==104   not valid
   i==16   ID+i==114   not valid
   i== 5   ID+i==103   not valid
   i==15   ID+i==113   not valid
   j== 1   ID+j==99   not valid
   j== 2   ID+j==100   not valid

   j== 3   98+3==101>lastResult==100 is True

--------------------------
now ID== 101
   ID>lastResult==101>100 is True ==> WILL STOP

==========================
ID==101
   ID>lastResult is True : program STOPS
    if ID in SEEN:
        print '-----------------\nID=='+str(ID)+'  already seen, not examined'
        ID += 1
import time

lastResult = 100

def checkNextID(ID, lastResult = lastResult, diff = [8,18,7,17,6,16,5,15]):
    runs = 0
    SEEN = set()
    while True:
        if ID>lastResult:
            print ('\n=========================='
                   '\nID==%s'
                   '\n   ID>lastResult is %s : program STOPS')\
                  % (ID,ID>lastResult,)
            break
        runs += 1
        if runs % 10 == 0:  time.sleep(0.5)
        if ID in SEEN:
            print '-----------------\n%s\nID==%s  already seen, not examined' % (SEEN,ID)
            ID += 1
        else:
            curRes = isValid(ID)
            if curRes:
                print '--------------------------\n%s\nID==%s  vaaaalid'  % (SEEN,ID)
                while True:
                    for i in diff:
                        runs += 1
                        if runs % 10 == 0:  time.sleep(0.5)
                        curRes = isValid(ID+i)
                        print '   '+str(SEEN)
                        if i==diff[0]:
                            SEEN = set([ID+i])
                        else:
                            SEEN.add(ID+i)
                        if curRes:
                            print '   i==%2s   ID+i==%s   valid' % (i,ID+i)
                            ID += i
                            print '--------------------------\nID==%s' % str(ID)
                            break
                        else:
                            print '   i==%2s   ID+i==%s   not valid' % (i,ID+i)
                    else:
                        ID += 1
                        break
            else:
                print '--------------------------\n%s\nID==%s  not vaaaaalid' % (SEEN,ID)
                ID += 1


def isValid(ID, valid_ones = (1,9,17,25,30,50,52,60,83,97,98)):
    return ID in valid_ones


checkNextID(0)
--------------------------
set([])
ID==0  not vaaaaalid
--------------------------
set([])
ID==1  vaaaalid
   set([])
   i== 8   ID+i==9   valid
--------------------------
ID==9
   set([9])
   i== 8   ID+i==17   valid
--------------------------
ID==17
   set([17])
   i== 8   ID+i==25   valid
--------------------------
ID==25
   set([25])
   i== 8   ID+i==33   not valid
   set([33])
   i==18   ID+i==43   not valid
   set([33, 43])
   i== 7   ID+i==32   not valid
   set([32, 33, 43])
   i==17   ID+i==42   not valid
   set([32, 33, 42, 43])
   i== 6   ID+i==31   not valid
   set([32, 33, 42, 43, 31])
   i==16   ID+i==41   not valid
   set([32, 33, 41, 42, 43, 31])
   i== 5   ID+i==30   valid
--------------------------
ID==30
   set([32, 33, 41, 42, 43, 30, 31])
   i== 8   ID+i==38   not valid
   set([38])
   i==18   ID+i==48   not valid
   set([48, 38])
   i== 7   ID+i==37   not valid
   set([48, 37, 38])
   i==17   ID+i==47   not valid
   set([48, 37, 38, 47])
   i== 6   ID+i==36   not valid
   set([48, 36, 37, 38, 47])
   i==16   ID+i==46   not valid
   set([36, 37, 38, 46, 47, 48])
   i== 5   ID+i==35   not valid
   set([35, 36, 37, 38, 46, 47, 48])
   i==15   ID+i==45   not valid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==31  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==32  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==33  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==34  not vaaaaalid
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==35  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==36  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==37  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==38  already seen, not examined
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==39  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==40  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==41  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==42  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==43  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==44  not vaaaaalid
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==45  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==46  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==47  already seen, not examined
-----------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==48  already seen, not examined
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==49  not vaaaaalid
--------------------------
set([35, 36, 37, 38, 45, 46, 47, 48])
ID==50  vaaaalid
   set([35, 36, 37, 38, 45, 46, 47, 48])
   i== 8   ID+i==58   not valid
   set([58])
   i==18   ID+i==68   not valid
   set([58, 68])
   i== 7   ID+i==57   not valid
   set([57, 58, 68])
   i==17   ID+i==67   not valid
   set([57, 58, 67, 68])
   i== 6   ID+i==56   not valid
   set([56, 57, 58, 67, 68])
   i==16   ID+i==66   not valid
   set([66, 67, 68, 56, 57, 58])
   i== 5   ID+i==55   not valid
   set([66, 67, 68, 55, 56, 57, 58])
   i==15   ID+i==65   not valid
--------------------------
set([65, 66, 67, 68, 55, 56, 57, 58])
ID==51  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 55, 56, 57, 58])
ID==52  vaaaalid
   set([65, 66, 67, 68, 55, 56, 57, 58])
   i== 8   ID+i==60   valid
--------------------------
ID==60
   set([60])
   i== 8   ID+i==68   not valid
   set([68])
   i==18   ID+i==78   not valid
   set([68, 78])
   i== 7   ID+i==67   not valid
   set([67, 68, 78])
   i==17   ID+i==77   not valid
   set([67, 68, 77, 78])
   i== 6   ID+i==66   not valid
   set([66, 67, 68, 77, 78])
   i==16   ID+i==76   not valid
   set([66, 67, 68, 76, 77, 78])
   i== 5   ID+i==65   not valid
   set([65, 66, 67, 68, 76, 77, 78])
   i==15   ID+i==75   not valid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==61  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==62  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==63  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==64  not vaaaaalid
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==65  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==66  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==67  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==68  already seen, not examined
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==69  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==70  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==71  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==72  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==73  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==74  not vaaaaalid
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==75  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==76  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==77  already seen, not examined
-----------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==78  already seen, not examined
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==79  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==80  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==81  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==82  not vaaaaalid
--------------------------
set([65, 66, 67, 68, 75, 76, 77, 78])
ID==83  vaaaalid
   set([65, 66, 67, 68, 75, 76, 77, 78])
   i== 8   ID+i==91   not valid
   set([91])
   i==18   ID+i==101   not valid
   set([91, 101])
   i== 7   ID+i==90   not valid
   set([90, 91, 101])
   i==17   ID+i==100   not valid
   set([90, 91, 100, 101])
   i== 6   ID+i==89   not valid
   set([89, 90, 91, 100, 101])
   i==16   ID+i==99   not valid
   set([99, 100, 101, 89, 90, 91])
   i== 5   ID+i==88   not valid
   set([99, 100, 101, 88, 89, 90, 91])
   i==15   ID+i==98   valid
--------------------------
ID==98
   set([98, 99, 100, 101, 88, 89, 90, 91])
   i== 8   ID+i==106   not valid
   set([106])
   i==18   ID+i==116   not valid
   set([106, 116])
   i== 7   ID+i==105   not valid
   set([105, 106, 116])
   i==17   ID+i==115   not valid
   set([105, 106, 115, 116])
   i== 6   ID+i==104   not valid
   set([104, 105, 106, 115, 116])
   i==16   ID+i==114   not valid
   set([104, 105, 106, 114, 115, 116])
   i== 5   ID+i==103   not valid
   set([103, 104, 105, 106, 114, 115, 116])
   i==15   ID+i==113   not valid
--------------------------
set([103, 104, 105, 106, 113, 114, 115, 116])
ID==99  not vaaaaalid
--------------------------
set([103, 104, 105, 106, 113, 114, 115, 116])
ID==100  not vaaaaalid

==========================
ID==101
   ID>lastResult is True : program STOPS

Python Crawler - AttributeError: Crawler instance has no attribute 'url'


Tag : python , By : Nigel
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You're saying self.url which is referring to the Crawler class's url attribute, which does not exist. You need to use just url since that's the name of the variable from your visit() function arguments.

Tips to optimize this .NET crawler algorithm


Tag : sql , By : Kuer
Date : March 29 2020, 07:55 AM
I hope this helps you . Only do one single fetch, outside the for-each-loop:
SELECT id, link FROM posts with (nolock) WHERE link in (@listOfLowerCaseLinks)
Dim myListOfLinks As New List(Of String)
...
TheCommand.Parameters.AddWithValue("@listOfLowerCaseLinks", myListOfLinks)

Scala code changes for algorithm


Tag : arrays , By : Jakub Filak
Date : March 29 2020, 07:55 AM
Hope that helps I have the following Scala code in which z represents array of strings with each string representing a datapoint of a dataset. , A Scalish approach that may convey the intended semantics, like this
val xs = y.split("\n")
val res = 
  for { zi <- xs
        zj <- xs
        if score(zi,zj) < threshold
      }
  yield zj

res.mkString
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