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November 4, 2019 18:50
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Un script pour collecter les en-têtes d'articles du site Le Monde.fr à des fins exploratoire (text mining)
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library(rvest) | |
library(data.table) | |
annees=1980:2019 | |
annee = sample(annees,1) | |
pbapply::pblapply(annees,function(annee){ | |
pbapply::pblapply(1:250,function(i){ | |
tryCatch({ | |
url = sprintf(paste0("https://www.lemonde.fr/recherche/", | |
"?search_keywords=a&start_at=01/01/%s&", | |
"end_at=31/12/%s&search_sort=relevance_desc&page=%s"),annee,annee,i) | |
page = rvest::html_session(url) | |
href = page%>%html_nodes("section.teaser")%>%html_node("a")%>%html_attr("href") | |
title = page%>%html_nodes("section.teaser")%>%html_node("h3")%>%html_text() | |
abstract = page%>%html_nodes("section.teaser")%>%html_node("p")%>%html_text() | |
date = page%>%html_nodes("section.teaser")%>%html_node("span.meta__date")%>%html_text() | |
data = data.frame(href=href,title=title,abstract=abstract,date=date,stringsAsFactors = F) | |
save(data,file=paste0("lemonde_scraping/a_",annee,"_",i,".RData")) | |
}) | |
}) | |
}) | |
files = list.files("lemonde_scraping/") | |
annees = table(substr(files,3,6)) | |
annees = names(annees[annees==250]) | |
grid =expand.grid(annee=as.numeric(annees),nb=1:250,stringsAsFactors = F) | |
scrape = pbapply::pbapply(grid,1,function(x){ | |
print(x) | |
load(paste0("lemonde_scraping/a_",x[1],"_",x[2],".RData")) | |
data | |
}) | |
scrape_dt = rbindlist(scrape) | |
scrape_dt=unique(scrape_dt) | |
save(scrape_dt,file="lemonde_scraping_10k_per_annee.RData") |
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