Count number of 1's in an array in Python [duplicate]

Question

I have an array A. I want to count the number of 1's in the array but I am getting an error. I present the expected output.

import numpy as np

A=np.array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0,
       0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])

B=np.count(A==1)
print(B)

The error is

in __getattr__
    raise AttributeError("module {!r} has no attribute "

AttributeError: module 'numpy' has no attribute 'count'

The expected output is

Samathingamajig · Accepted Answer · 2023-02-06 07:44:00Z

-1

The np.count function does not exist, you can use np.count_nonzero instead.

import numpy as np

A=np.array([0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 1, 0, 0, 0, 1, 0, 0,
       0, 1, 1, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0])

B=np.count_nonzero(A==1) # or just A, if you'll never have anything other than 0 or 1
print(B)

answered Feb 6, 2023 at 7:44

Samathingamajig

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