def load_map(mapFilename):
"""
_parses the map file and constructs a directed graph
_parameters:
mapFilename : name of the map file
Assumes:
Each entry in the map file consists of the following four positive
integers, separated by a blank space:
From To TotalDistance DistanceOutdoors
e.g.
32 76 54 23
This entry would become an edge from 32 to 76.
Returns:
a directed graph representing the map
"""
# TODO
print "Loading map from file..."
campus = WeightedDigraph()
with open(mapFilename) as infile:
for line in infile:
data = line.split()
for d in data[:2]:
try:
campus.addNode(d)
except ValueError:
pass
campus.addEdge(Edge(data[0], data[1]))
campus.addWeights(data[0], data[1], map(int, data[2:]))
return campus
