Odtnhj

def get_neighbors_link_cost(source_id, network_topology):
 nodes = network_topology['nodes']


# get network topology links
links = network_topology['links'].keys()
#print(links)

# get the link costs in network topology
link_cost = network_topology['links']
#print(link_cost)

# make an empty dictionary for neighbor_link_cost
#neighbor_link_cost = None
neighbor_link_cost = 

# add the cost to the source_id as zero
#neighbor_link_cost[None] = None
neighbor_link_cost[source_id] = 0
#print(neighbor_link_cost)

# go through the link
for link in links:
 # if source id is not in the link, skip it
 if source_id not in link:
 continue
 # get the neighbor information and cost for this neighbor
 neighbor = link[0] if source_id == link[1] else link[1]
 #neighbor_link_cost[None] = None
 #neighbor_link_cost[neighbor] = 3
 neighbor_link_cost[neighbor] = link(source_id,neighbor)
 #neighbor_link_cost[neighbor] = link_cost.get('z','x')
 #print(neighbor_link_cost[neighbor])

return neighbor_link_cost

network_topology = 'nodes': set(['z','x','y','w','v','u','t']),
 'links': ('z','x'): 8,
 ('z','y'): 12,
 ('x','y'): 6,
 ('x','w'): 6,
 ('x','v'): 3,
 ('y','t'): 7,
 ('y','v'): 8,
 ('v','t'): 4,
 ('v','w'): 4,
 ('v','u'): 3,
 ('t','u'): 2,
 ('w','u'): 3
 
 

source_id = 'v'
get_neighbors_link_cost(source_id, network_top)

Expected output should be:

Expected output: 'v': 0, 'x': 3, 'y': 8, 't': 4, 'w': 4, 'u': 3

What should be this line to get expected output? Thank you in advance

neighbor_link_cost[neighbor] = link(source_id,neighbor)

'tuple' object is not callable

change this to

neighbor_link_cost[neighbor] = links[link]

you're really close, just need to change:

neighbor_link_cost[neighbor] = link(source_id,neighbor)

to:

neighbor_link_cost[neighbor[source_id]] = link_cost[link]

then should get expected output.