Zero pad numpy array

Question

What\'s the more pythonic way to pad an array with zeros at the end?

def pad(A, length):
    ...

A = np.array([1,2,3,4,5])
pad(A, 8)    # expected : [1,2,3,         


        

Answer 1

You could also use numpy.pad:

>>> A = np.array([1,2,3,4,5])
>>> npad = 8 - len(A)
>>> np.pad(A, pad_width=npad, mode='constant', constant_values=0)[npad:]
array([1, 2, 3, 4, 5, 0, 0, 0])

And in a function:

def pad(A, npads):
    _npads = npads - len(A)
    return np.pad(A, pad_width=_npads, mode='constant', constant_values=0)[_npads:]