如何分配给零维numpy数组？

Question

Suppose I have an array like x = np.array(3) which has x.ndim == 0 . How do I assign a new value to this array? x[0] = 2 gives IndexError , as does x[:] = 2 .

Answer 1

This can be done using x.flat which returns an np.flatiter instance:

import numpy as np

x = np.array(3)
x.flat[:] = 2
# or x.flat[0] = 2

or by indexing the original array with ellipsis or an empty tuple:

x[...] = 2
x[()] = 2

Answer 2

I will using put

x.put(0,2)
x
Out[91]: array(2)