hub_station_naptans.py

import requests

# Say the user's home station is Woolwich Arsenal and they travel by NR and DLR
search_result = requests.get('https://api.tfl.gov.uk/StopPoint/Search?query=woolwich').json()['matches'][0]

# Get the StopPoint's line data
stoppoint = requests.get('https://api.tfl.gov.uk/StopPoint/{}'.format(search_result['id'])).json()

# Set modes for each requested mode that's actually provided by the station
requested_modes = ['dlr', 'national-rail']
modes = set(requested_modes).intersection(stoppoint['modes'])

# Get a list of lineIdentifiers for each mode
# DLR may be 'dlr' but national-rail could be any/multiple TOCs, in this case 'southeastern'
# e.g. mode_lines = {'dlr': ['dlr'], 'national-rail': ['southeastern']}

for mode in modes:
    # Get lines served on this mode
    lines = [lineId
        for lineModeGroup in stoppoint['lineModeGroups']
        for lineId in lineModeGroup['lineIdentifier']
        if lineModeGroup['modeName'] == mode]

    # Get station NaPTAN IDs for each line
    station_ids = set([group['stationAtcoCode']
        for line in lines
        for group in stoppoint['lineGroup']
        if line in group['lineIdentifier']])

    print(mode, station_ids)