How to use columns of a key in a dict in Python?

Question

I have a dict as dict = {'a': array[5, 5]} , here array[5, 5] means it is read from a data file as a form of an array by 5X5. And I just want to use the first column of the value like dict['a': array[:, 1]] , how can I make it? Thanks! Part of my code is:

coord['c%i' % i] = np.loadtxt('0cracknodecoord.txt', usecols=(0, 1))
print (coord['c1': array[:, [1]]])

The print (coord['c1': array[:, [1]]]) didn't work.

Answer 1

I'm not sure, but I think you want:

dict['a'][:,1]

You were pretty close already!