Magic Square Puzzle

[Harnick]

my question here
Hi I'm new to python and i have been tasked with creating a magic square puzzle. However the inputs for the magic square puzzle have to be provided through a file. This is the task:
 The program should prompt the user for the filename of a text file to open – some Python error handling should be used in case the user enters the name of a file that does not exist.

 The program should read the contents of the given text file and store this in a suitable Python data structure.

 Appropriate validation should be in place to ensure the supplied file contains a complete n x n square grid of digits, and ensure the digits are all integers in the range 1 to n2; a suitable error message should be returned where necessary.

 Assuming a suitable n x n square grid of integers is successfully loaded into the chosen data structure; further checks should then be performed to ensure that the sums of each row, each column, and each of the two diagonals are all equal.

 If any errors are detected in the puzzle board then details of these errors should be given to the user.

 If the puzzle board passes all the validation checks, then it should be written into a new text file using the same format as the original input file (see the example text files above) – the name for this new text file should be the original filename entered by the user prefixed with “VALID_”.
I would really appreciate it if anyone could help me with this task as I have been struggling.

Many Thanks

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Further adding to this, this is the code i have so far:

fr = open('magicsquare1.txt', 'r')
#Calculating Totals for each row
for line in fr:
    total = 0
    line = line.split()
    c = len(line)
    print(line)

    for i in range(c):
        total = total +int(line[i])

print("total:", total)