human
Longest path between any pair of vertices | visited [ ] array to make nodes visited src is starting node for DFS traversal prev_len is sum of cable length till current node max_len is pointer which stores the maximum length of cable value after DFS traversal.
Mark the src node visited.
curr_len is for length of cable from src city to its adjacent city.
Adjacent is pair type which stores destination city and cable length.
Traverse all adjacent.
Adjacent element.
If node or city is not visited.
Total length of cable from src city to its adjacent.
Call DFS for adjacent city.
If total cable length till now greater than previous length then update it.
make curr_len = 0 for next adjacent.
n is number of cities or nodes in graph cable_lines is total cable_lines among the cities or edges in graph.
maximum length of cable among the connected cities.
call DFS for each city to find maximum length of cable.
initialize visited array with 0.
Call DFS for src vertex i.
Driver Code.
n is number of cities.
create undirected graph first edge.
second edge.
third edge.
fourth edge.
fifth edge"
How can the above be solved in Python?

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Give me a code to longest path between any pair of vertices and the other steps required?
assistant
#Here is code to longest path between any pair of vertices and the other steps required.
 def DFS ( graph , src , prev_len , max_len , visited ) :
	visited [ src ] = 1
	curr_len = 0
	adjacent = None
	for i in range ( len ( graph [ src ] ) ) :
		adjacent = graph [ src ] [ i ]
		if ( not visited [ adjacent [ 0 ] ] ) :
			curr_len = prev_len + adjacent [ 1 ]
			DFS ( graph , adjacent [ 0 ] , curr_len , max_len , visited )
		if ( max_len [ 0 ] < curr_len ) :
			max_len [ 0 ] = curr_len
		curr_len = 0
def longestCable ( graph , n ) :
	max_len = [ - 999999999999 ]
	for i in range ( 1 , n + 1 ) :
		visited = [ False ] * ( n + 1 )
		DFS ( graph , i , 0 , max_len , visited )
	return max_len [ 0 ]
if __name__ == ' _ _ main _ _ ' :
	n = 6
	graph = [ [ ] for i in range ( n + 1 ) ]
	graph [ 1 ] . append ( [ 2 , 3 ] )
	graph [ 2 ] . append ( [ 1 , 3 ] )
	graph [ 2 ] . append ( [ 3 , 4 ] )
	graph [ 3 ] . append ( [ 2 , 4 ] )
	graph [ 2 ] . append ( [ 6 , 2 ] )
	graph [ 6 ] . append ( [ 2 , 2 ] )
	graph [ 4 ] . append ( [ 6 , 6 ] )
	graph [ 6 ] . append ( [ 4 , 6 ] )
	graph [ 5 ] . append ( [ 6 , 5 ] )
	graph [ 6 ] . append ( [ 5 , 5 ] )
	print ( " Maximum ▁ length ▁ of ▁ cable ▁ = " , longestCable ( graph , n ) )