trains.py

import requests

def fetchPredictions():
	apikey = ""

	filter_route = "Green-B,Green-C,Green-D,Green-E"
	include = "vehicle,trip"
	p = {"filter[route]": filter_route, "include": include}

	result = requests.get("https://api-v3.mbta.com/predictions", params=p).json()

	return result
	
def findNew(result):
	SERIES = "39"
	out = []
	for v in result['included']:
		if v['attributes'].get('label'):
			ids = v['attributes'].get('label').split("-")
			if any(id.startswith(SERIES) for id in ids):
				out.append(v)
				
	return out			

print(findNew(fetchPredicions))