How Can I Set First Number on Each Text File Line to be Initial Node in Dijkstra?

[Greg Jackson]

Hello,

I am attempting to recreate Dijkstra's algorithm in Python but everything is going wrong.
Here is my code:

def twoDArray():
    network = []
    sourceNode[]       
    f = open('twoDArray.txt', 'r')
    #network = []  
    for line in f:
                sourceNode.append(line.split(',') [0])
    line = line = line.rstrip('\n')
    row = line.split(',')
    irow = [int(item) for item in row]
        network.append(irow)
 
    print "Network = "
    print network
 
#def main():
 
if __name__ == "__main__":
    twoDArray()
 

I have a text file containing the distances between nodes that looks similar to this:

0,1,2,3,4,5,6,7,8,9,10,11,12
1,0,3,6,2,7,4,8,6,9,12,10,12

What I am trying to do is to populate a 2D array, which works OK, but then for each line set an initial node so that the distance from the initial node to another node can be calculated, though it isn't working and I don't know what to try next