import pywikibot

site = pywikibot.Site("en", "wikipedia")

with open("articles.txt") as F:
    articles = F.strip().split('\n')

F = open("results.txt", "w")

for name in articles:
    page = pywikibot.Page(site, name)
    text = page.extract()
    F.write(text)
    F.write('\n\n')

F.close()