How to count the number of true elements in a NumPy bool array

Question

I have a NumPy array \'boolarr\' of boolean type. I want to count the number of elements whose values are True. Is there a NumPy or Python routine dedicated for

Answer 1

That question solved a quite similar question for me and I thought I should share :

In raw python you can use sum() to count True values in a list :

>>> sum([True,True,True,False,False])
3

But this won't work :

>>> sum([[False, False, True], [True, False, True]])
TypeError...