def get_active_stations():
updated_metro = vc_metro
for station_under_construction in stations_under_construction:
for current_station, neighboring_stations in vc_metro.items():
if current_station != station_under_construction:
updated_metro[current_station] -= set(stations_under_construction)
else:
updated_metro[current_station] = set([])
return updated_metro
def get_active_stations(): # returns graph of available stations
updated_metro = vc_metro
for station_under_construction in stations_under_construction:
for current_station, neighbouring_stations in vc_metro.items():
if current_station != station_under_construction: # remove any references to closed stations
updated_metro[current_station] -= set(stations_under_construction)
else: # if station closed, remove all connections
updated_metro[current_station] = set([])
return updated_metro
def get_active_stations():
updated_metro = vc_metro
for station_under_construction in stations_under_construction:
for current_station, neighboring_stations in vc_metro.items():
if current_station != station_under_construction:
updated_metro[current_station] -= set(
stations_under_construction
) # Remove the connections between current and constructing stations
else:
updated_metro[current_station] = set([])
return updated_metro
def get_active_stations():
updated_metro = vc_metro
#loop checking for any connections to and from stations which are closed
for station_under_construction in stations_under_construction:
for current_station, neighboring_station in vc_metro.items():
if current_station != station_under_construction:
#this will set substract stations under construction from updated_metro.
updated_metro[current_station] -= set(
stations_under_construction)
#when the current_station is a station_under_construction
else:
updated_metro[current_station] = set([])
return updated_metro
def get_active_stations():
# we copy the stations dictionary
updated_metro = vc_metro
# in order to create the updated system, we need to remove any connections to and from the closed stations
# we loop through the list of stations_under_construction
for station_under_construction in stations_under_construction:
# loop through all keys and values in the vc_metro dictionary
for current_station, neighboring_stations in vc_metro.items():
# check if the current station is not the station under construction we are looking at in the outer loop
if station_under_construction != current_station:
# if it’s not, we want to remove any of its connecting stations that are under construction
# we add the current station to the new dictionary with a value of its current set of stations
# minus a set of the stations_under_construction
updated_metro[current_station] = neighboring_stations - set(stations_under_construction)
else:
# if the current_station is the station_under_construction
# we add it to the new dictionary with a value of a set with an empty list that means no connections to and from this station
# this will allow us to keep the current landmarks dictionary but prevent any connections from the stations that are under repair
updated_metro[current_station] = set([])
# when the loops are finished the new graph is ready
return updated_metro
