Dab tsi yog qhov txawv ntawm web scraping thiab web crawling?
Dab tsi yog qhov txawv ntawm web scraping thiab web crawling?

Video: Dab tsi yog qhov txawv ntawm web scraping thiab web crawling?

Video: Dab tsi yog qhov txawv ntawm web scraping thiab web crawling?
Video: Google Colab - Searching for News with Python! 2024, Hlis ntuj nqeg
Anonim

Nkag mus feem ntau yog hais txog kev cuam tshuam nrog cov ntaub ntawv loj-poob uas koj tsim koj tus kheej crawlers (los yog bots) uas nkag mus mus rau qhov tob tshaj ntawm cov web nplooj ntawv. Cov ntaub ntawv khawb ntawm qhov tod tes, hais txog kev muab cov ntaub ntawv los ntawm ib qho twg (tsis tas yuav yog web ).

Ib yam li ntawd, Web crawling siv rau dab tsi?

Web crawlers feem ntau yog siv rau tsim cov ntawv luam ntawm tag nrho cov nplooj ntawv tuaj xyuas rau tom qab ua tiav los ntawm lub tshuab tshawb nrhiav, uas yuav ntsuas cov nplooj ntawv rub tawm los muab kev tshawb nrhiav nrawm. Crawlers tuaj yeem yog siv rau automatingmaintenance cov haujlwm ntawm a Web site, xws li xyuas cov kev sib txuas lossis kev lees paub HTML code.

Tsis tas li ntawd, Web Crawler yog dab tsi thiab nws ua haujlwm li cas? A tus crawler yog ib qhov program uas tuaj xyuas Web cov chaw thiab nyeem lawv cov nplooj ntawv thiab lwm cov ntaub ntawv txhawm rau tsim cov ntawv nkag rau kev tshawb fawb cav index. Qhov loj search engineson lub Web txhua tus muaj cov kev pab cuam, uas tseem hu ua "kab laug sab" lossis "bot."

Kuj paub yog, Web scraping raug cai?

Web scraping thiab nkag los tsis yog txhaum cai los ntawm lawv tus kheej. Tom qab tag nrho, koj ua tau txhuam los yog nkag rau koj tus kheej lub vev xaib, tsis muaj kev cuam tshuam. Web scraping pib hauv a raug cai grey cheeb tsam qhov twg siv bots txhuam awebsite tsuas yog kev ntxhov siab xwb.

Puas yog Web scraping raug cai hauv Is Nrias teb?

Technically, koj tuaj yeem siv cov ntaub ntawv rho tawm rau hauv koj lub vev xaib nrog ib qho ntawm web scraping cov cuab yeej xws liAgenty thiab lwm yam. Yog li, qhov teeb meem yog seb nws yog raug cai siv cov ntaub ntawv rho tawm lossis tsis. Tom qab ntawd ib yam nkaus, tsis muaj kev ua txhaum cai kev cai ntawm IT thiab txhua qhov kev ua txhaum cai hauv qhov chaw no.

Pom zoo: