[Python] Schiphol flight api, get flight information with python gets error

I'm trying to get data from a public api from schiphol (airport in Amsterdam). Im getting this api from https://api.schiphol.nl/public-flights/flights.

I'm using python to get the flight data. In my code I get the error that the "app_id" is none while this is filled in....

the full error from the console: Usage: flight_info_api.py [options]

flight_info_api.py: error: Please provide an app id (-i, --app_id)

Can anybody see what is going wrong?

My code:

import requests
import sys
import optparse


def callPublicFlightAPI(options):
url = 'https://api.schiphol.nl/public-flights/flights'

headers = {
'resourceversion': 'v4',
'app_id': 'b209eb7f',
'app_key': '0b6c58b5ae4595dd39785b55f438fc70'
}

try:
response = requests.request('GET', url, headers=headers)
except requests.exceptions.ConnectionError as error:
print(error)
sys.exit()

if response.status_code == 200:
flightList = response.json()
print('found {} flights.'.format(len(flightList['flights'])))
for flight in flightList['flights']:
print('Found flight with name: {} scheduled on: {} at {}'.format(flight['flightName'],
flight['scheduleDate'],
flight['scheduleTime']))
else:
print('''Oops something went wrong Http response code: {}{}'''.format(response.status_code, response.text))


if __name__ == '__main__':
parser = optparse.OptionParser()
parser.add_option('-i', '--app_id', dest='app_id',
help='App id used to call the API')
parser.add_option('-k', '--app_key', dest='app_key',
help='App key used to call the API')

(options, args) = parser.parse_args()
if options.app_id is None:
parser.error('Please provide an app id (-i, --app_id)')

if options.app_key is None:
parser.error('Please provide an app key (-key, --app_key)')

callPublicFlightAPI(options)

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