# Answered Essay: I have a text file 'G.txt' that has the looks like this:

I have a text file ‘G.txt’ that has the looks like this:

Prepare a python program which accepts a file name and produces an adjacency matrix based on the data in that file. Make sure that you can identify vertices by their name (which need not be one character) and be sure to close the file when you are done with it.

Then, add to your existing python file a program which accepts a file name and a table representing an adjacency matrix which writes the adjacency matrix to that file.

**You are not allowed to import any Python library or module and should not be using any inbuilt python functions that simplify the tasks you are told to implement.

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code:

”’

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”’
fname=”G.txt”
with open(fname) as f:
content = [x.strip() for x in content]
i=0
for line in content:
if i==0:
vertices=line.split(“:”)
i=i+1
print(“Vertices are “,vertices)
length=len(vertices)

#create the matrix
Matrix = [[0 for x in range(length+1)] for y in range(length+1)]

#print the vertex name in matrix (0th row and 0th col)
i=1
for v in vertices:
Matrix[i][0]=v
Matrix[0][i]=v
i=i+1

res=”” # result matrix string
#generate the matrix
i=0
for line in content:
if i!=0:
weights=line.split()
j=1
for w in weights: # if weight !=0, then two vertices are adjacent
if w!=’0′:
Matrix[i][j]=1
else:
Matrix[i][j]=0 #otherwise, no edge between the vertices
j=j+1
i=i+1

#write the matrix in proper format to the result string
for m in Matrix:
for l in m:
res += str(l)+” ”
#print(l,end=’ ‘)
res+=”n”
#print()

#print the result matrix( string formatted)
print(res)

#write the matrix to the file
print(“enter output file name:”)
name=input()
f = open(name, ‘w’)
f.write(res) # write the resulted adjacency matrix to the output file
f.close()

Pages (550 words)
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