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 i e  1 3  2 4  3 5 and 2 0  I am using the below code   data np loadtxt fname  textfile txt     to load the above two column xy  data for XY in xy     i 0      Z XY i 0  XY i 1     i i 1          print  Z    But I received an error saying numpy ndarray object is not callable  Why does this happen  How can I do this simple calculation  Thanks

User · Answer

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

User · Answer

The error TypeError   numpy ndarray  object is not callable means that you tried to call a numpy array as a function    Use  Z XY 0  XY 1    Instead of  Z XY i 0  XY i 1

User · Answer

Avoid loops  What you want to do is   import numpy as np data np loadtxt fname  data txt     to load the above two column print data print data sum axis 1

User · Answer

Sometimes  when a function name and a variable name to which the return of the function is stored are same  the error is shown  Just happened to me

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

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