`pip install twilio`

vaccine.py

import os
import datetime
import requests
import time
from twilio.rest import Client

account_sid = <SID>
auth_token = <AUTH>

PIN = <PINCODE>
MY_PHONE = <REGISTERED ON TWILIO>
MY_TWILIO_NUMBER = <TWILIO NUMBER>

client = Client(account_sid, auth_token)
URL = "https://cdn-api.co-vin.in/api/v2/appointment/sessions/public/calendarByPin"


def get_appointments(date):
    params = {"date": date, "pincode": PIN}
    resp = requests.get(URL, params=params)
    data = resp.json()
    centers = data["centers"]
    available_centers = [c for c in centers for s in c["sessions"] if s["available_capacity"] > 0]
    return available_centers


def call():
    call = client.calls.create(
                            twiml='<Response><Say>VACCINE IS AVAILABLE, RUN!</Say></Response>',
                            to=MY_PHONE,
                            from_=MY_TWILIO_NUMBER
                        )

    print(call.sid)


def main():
    while True:
        try:
            today = datetime.datetime.today()
            tom = (today + datetime.timedelta(days=0)).strftime("%d-%m-%Y") # EDITED, UI seems to be seding today's date for next. 7 days data
            tom1 = (today + datetime.timedelta(days=1)).strftime("%d-%m-%Y")
            appts = []
            appts.extend(get_appointments(tom))
            appts.extend(get_appointments(tom1))
            print(appts)
            if appts:
                call()
        except Exception as e:
            print("Exception:", e)
        time.sleep(50)


if __name__ == "__main__":
    main()