turingo.py

import requests
from bs4 import BeautifulSoup
finalList = []
pages = [   'https://simple.wikipedia.org/wiki/Category:Natural_resources', 
            'https://simple.wikipedia.org/wiki/Category:Hydrogen_compounds',
            'https://simple.wikipedia.org/wiki/Category:Oxygen_compounds', 
            'https://simple.wikipedia.org/wiki/Category:Oxides']
for i in range(len(pages)):            
    page = requests.get(pages[i])
    soup = BeautifulSoup(page.content, 'html.parser')

    all_links = soup.find_all('a')
    for link in all_links:
        s = str(link.get('href'))[:5]
        if s == 'https':
            finalList.append(link.get('href'))
            #print(link.get('href'))
    print('********')

print(len(finalList))
# Here in Final List you will get all the links.