api_pagination.py

#!/usr/bin/env python3
import requests


pages_max_number = 10

api_url = 'https://jsonplaceholder.typicode.com/todos/{}'


f = open('/tmp/results.json', 'w')

results = []

for i in range(0,pages_max_number+1):
    results.append(requests.get(api_url.format(i)).text)
fancy_json  = ',\n'.join(results)

f.write(fancy_json)
f.close()