
    Given a list of potential delivery routes where each route contains a delivery location ID and its estimated travel time during peak traffic, find the delivery location ID that has the shortest estimated travel time. The delivery routes are represented as pairs of (location_id, travel_time_in_minutes), and you need to return the location_id of the route with the minimum travel time.
    

    
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a list of potential delivery routes where each route contains a delivery location ID and its estimated travel time during peak traffic, find the delivery location ID that has the shortest estimated travel time. The delivery routes are represented as pairs of (location_id, travel_time_in_minutes), and you need to return the location_id of the route with the minimum travel time.
    

    """
from operator import itemgetter

def index_minimum(test_list):
    """
    Given a list of potential delivery routes where each route contains a delivery location ID and its estimated travel time during peak traffic, find the delivery location ID that has the shortest estimated travel time. The delivery routes are represented as pairs of (location_id, travel_time_in_minutes), and you need to return the location_id of the route with the minimum travel time.
    

    """
    res = min(test_list, key=itemgetter(1))[0]
    return res