Dijkstra algorithm helping find new space

[1bumcheek]

The output looks like this

Output:
[currentCoords[6,6]]
[['X' '_' '_' '_' '_'] 
 ['_' 'Z' 'Z' 'Z' '_'] 
 ['_' 'Z' '_' '_' '_'] 
 ['_' '_' '_' '_' '_'] 
 ['_' '_' 'Z' '_' '0']]

once it reaches next to the X in the top left corner it should stop and this should be fine however what I need first it the "_" to update from a "_" to a "1" however I don't know how I would implement that with the code.
Thank you for the response