In [1]: import requests

In [2]: import io

In [3]: 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://en.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: Felipe_de_Jesús_Villanueva_Gutiérrez
Valid pdf: Felipe_de_Jesús_Villanueva_Gutiérrez
Random page title: Lycée_François-Ier_(Le_Havre)
Invalid pdf: Lycée_François-Ier_(Le_Havre)
Random page title: John_LeKay
Invalid pdf: John_LeKay
Random page title: Grigny_(métropole_de_Lyon)
Invalid pdf: Grigny_(métropole_de_Lyon)
Random page title: Hulk
Valid pdf: Hulk
Random page title: Bethoncourt
Valid pdf: Bethoncourt
Random page title: Volta_Limburg_Classic
Valid pdf: Volta_Limburg_Classic
Random page title: Erna_Hennicot-Schoepges
Valid pdf: Erna_Hennicot-Schoepges
Random page title: Pothières
Valid pdf: Pothières
Random page title: Fabrice_Loiseau
Invalid pdf: Fabrice_Loiseau
Random page title: Ligne_3_Scarborough
Invalid pdf: Ligne_3_Scarborough
Random page title: Tarbes_Gespe_Bigorre
Valid pdf: Tarbes_Gespe_Bigorre
Random page title: Lustre_(ameublement)
Invalid pdf: Lustre_(ameublement)
Random page title: Julius_Robert_von_Mayer
Valid pdf: Julius_Robert_von_Mayer
Random page title: Bombardier_(avion)
Invalid pdf: Bombardier_(avion)
Random page title: Courléon
Valid pdf: Courléon
Random page title: Montreuil-Juigné
Valid pdf: Montreuil-Juigné
Random page title: Bibliothèque_universitaire_des_langues_et_civilisations
Valid pdf: Bibliothèque_universitaire_des_langues_et_civilisations
Random page title: Florent_III_de_Hollande
Invalid pdf: Florent_III_de_Hollande
Random page title: Orenbourg
Invalid pdf: Orenbourg

In [8]: valid
Out[8]: 11

In [9]: invalid
Out[9]: 9