How to populate an existing numpy array with specific dtype

Question

Let\'s say that I have this initial numpy array with some fixed dtype:

array = numpy.array([(1, \'a\'), (2, \'b\')],
                    numpy.dtype([(\'idfield\         


        

Answer 1

Like @juanpa.arrivillaga commented, it's cleaner to define your dtype only once:

array_dt = np.dtype([
    ('idfield', np.int32),
    ('textfield', '|S256')
])

Then define your second list of values as an array and then concatenate

array2 = np.array(value, array_dt)                                     
array = np.concatenate([array, array2])