In [6]: import requests
   ...: import io
   ...: from pdfminer.high_level import extract_text
   ...: 

In [7]: valid = 0
   ...: invalid = 0
   ...: for i in range(20):
   ...:     random = requests.get('https://fr.wikipedia.org/api/rest_v1/page/random/title')
   ...:     title = random.json()['items'][0]['title']
   ...:     print('Random page title: {}'.format(title))
   ...:     pdf = requests.get('https://fr.wikipedia.org/api/rest_v1/page/pdf/{}'.format(title))
   ...:     file = io.BytesIO(pdf.content)
   ...:     try:
   ...:         extract_text(file)
   ...:         valid += 1
   ...:         print('Valid pdf: {}'.format(title))
   ...:     except:
   ...:         invalid += 1
   ...:         print('Invalid pdf: {}'.format(title))
   ...: 

Random page title: Phare_de_Sainte-Marine
Valid pdf: Phare_de_Sainte-Marine
Random page title: Musées_royaux_des_Beaux-Arts_de_Belgique
Invalid pdf: Musées_royaux_des_Beaux-Arts_de_Belgique
Random page title: Argentine_(papillon)
Invalid pdf: Argentine_(papillon)
Random page title: Dampmart
Invalid pdf: Dampmart
Random page title: Canton_de_Romans-sur-Isère-1
Valid pdf: Canton_de_Romans-sur-Isère-1
Random page title: Béton_armé
Invalid pdf: Béton_armé
Random page title: Dobroudja
Invalid pdf: Dobroudja
Random page title: Saint-Maurice_(Nièvre)
Invalid pdf: Saint-Maurice_(Nièvre)
Random page title: Gare_de_Tangen
Valid pdf: Gare_de_Tangen
Random page title: Commune_de_Kohila
Invalid pdf: Commune_de_Kohila
Random page title: Basse-Ham
Invalid pdf: Basse-Ham
Random page title: Dennis_Reimer
Invalid pdf: Dennis_Reimer
Random page title: Sind
Invalid pdf: Sind
Random page title: Alliage
Invalid pdf: Alliage
Random page title: Columbia_Pictures
Invalid pdf: Columbia_Pictures
Random page title: RIPEMD-160
Invalid pdf: RIPEMD-160
Random page title: Université_de_Neuchâtel
Valid pdf: Université_de_Neuchâtel
Random page title: Livie
Invalid pdf: Livie
Random page title: Albrecht_Wilhelm_Roth
Invalid pdf: Albrecht_Wilhelm_Roth
Random page title: Shōgakukan
Invalid pdf: Shōgakukan