why numpy.ndarray is object is not callable in my simple for python loop

Question

I loaded a text file containing a two column matrix (e.g. below)

[ 1   3
  2   4
  3   5 
  2   0]

My calculation is just to sum each row

Answer 1

Avoid the for loopfor XY in xy: Instead read up how the numpy arrays are indexed and handled.

Numpy Indexing

Also try and avoid .txt files if you are dealing with matrices. Try to use .csv or .npy files, and use Pandas dataframework to load them just for clarity.