[Numpy-discussion] Creating array containing empty lists

[Stéfan van der Walt]

2009/3/25 Jesper Larsen <jesper.webmail at gmail.com>:
> import numpy as npy
> a = npy.empty((2), dtype=npy.object_)
>
> # Works fine:
> for i in range(len(a)):
>  a[i] = []
> print a
>
> # Does not work:
> a[:] = []
> a[:] = list()

Slightly simpler would be:

In [26]: x = np.empty((2,), dtype=object)
In [27]: x[:] = [[] * len(x)]

Stéfan