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# Importing required librariesimport sys
from collections import defaultdict
from queue import PriorityQueue
# Graph class representing the graph of edges and nodes
class Graph:
def __init__(self):
self.edges = defaultdict(list)
# This method is used to add a new edge in the network.
def add_edge(self, u, v, weight):
self.edges[u].append((v, weight))
# This method is to load the graph data and prepares graph
# from it.
def load_data(self, file_name):
f = open(file_name, "r")
while True:
line...