web - How to make python webcrawler infinite and record link once -

-

with of thenewboston able create nice little web crawler in python. after watching videos played around , added couple of things it. i've tried make infinite in every link on every link every recorded, have failed in doing so. have problem of recording same link more once? how go fixing problem?

this code.

import requests bs4 import beautifulsoup  def spider(max_pages):     page = 1     while page <= max_pages:         url = ''         source_code = requests.get(url)         plain_text = source_code.text         soup = beautifulsoup(plain_text, "html.parser")         link in soup.findall("a"):             href = link.get("href")             title = link.get("title")             links = []             #print(href)             #print(title)             try:                 get_single_user_data(href)             except:                 pass         page += 1  def get_single_user_data(user_url):     source_code = requests.get(user_url)     plain_text = source_code.text     soup = beautifulsoup(plain_text, "html.parser")     #for item_name in soup.findall('span', {'id':'mm-saledscprc'}):     #   print(item_name.string)     link in soup.findall("a"):         href = link.get("href")         print(href)   spider(1)

i've tried make infinite in every link on every link every recorded

that's not going happen unless have decently sized datacentre. sake of it. need larger starting pool of websites crawl links other websites, , you'll far enough. start outbound links reddit or something.

i have problem of recording same link more once?

i recommend recording links have been using hash table record websites you've visited, , check if link there before visiting it.


Comments

Post a Comment

Popular posts from this blog

c - Bitwise operation with (signed) enum value -

-
i using enumerator values flags: typedef enum { = 0x00, b = 0x01u, // u has no influence, expected c = 0x02u, // u has no influence, expected ... } enum_name; volatile unsigned char* reg = someaddress; *reg |= b; according misra-c:2004 bitwise operations shall not done signed type. unfortunately, compiler iar use signed int (or short or char) underlying type of enums, , option can find relates size, not signedness ("--enum-is-int"). according iar c/c++ development guide arm , pages 169 , 211, can define type of enum s if enable iar language extensions ( -e command-line option, or project > options > c/c++ compiler > language > allow iar extensions in ide). in particular, should define "sentinel" value, make sure compiler chooses correct type. prefers signed types, , uses smallest possible integer type, sentinel should largest positive integer corresponding unsigned integer type can describe. example, typedef enum
Read more

xslt - Unnest parent nodes by child node -

-
in xml there items 0-n attributes , item should copied each attribute new item 1 attribute. given xml this: <?xml version="1.0" encoding="utf-8" ?> <items> <item> <name>a</name> <attributes> <attribute> <key>attribute1</key> <value>1</value> </attribute> </attributes> </item> <item> <name>b</name> </item> <item> <name>c</name> <attributes> <attribute> <key>attribute1</key> <value>5</value> </attribute> <attribute> <key>attribute2</key> <value>2</value> </attribute> <attribute> <key>attri
Read more

YouTubePlayerFragment cannot be cast to android.support.v4.app.Fragment -

-
im stuck on 3 days , have tried have come across after lots of searching ,this post last resort, im trying open youtubeplayerfragment using navigation drawer youtubeplayerfragment cannot cast android.support.v4.app.fragment problem edit question : have updated code have used youtubeplayersupportfragment instead of youtubeplayerfragment ,i error in displayview method (case 4: fragment = new youtube(); break;) in main activity saying cannot convert youtube fragment , cannot logcat since cant run it edit question 2: code updated again have runtime problem ,heres logcat 07-22 22:15:09.782: e/androidruntime(20603): fatal exception: main 07-22 22:15:09.782: e/androidruntime(20603): process: net.frankandwalters, pid: 20603 07-22 22:15:09.782: e/androidruntime(20603): java.lang.nullpointerexception: attempt invoke virtual method 'void com.google.android.youtube.player.youtubeplayerview.a()' on null object reference 07-22 22:15:09.782: e/androidruntime(20603): @ com.goog
Read more