Efficient way to index a list with a numpy bool array in Python

Question

如标题所示，索引具有(n,)布尔ndarray ar且len(l) == ar.shape[0]的list l的最有效方法是什么？

Answer 1

Ok, let's make a list of idioms you could try. Time them you'll have to do yourself, because it will depend on the sizes and also the sparsity of ar , cf. @Imanol Luengo's comment

np.array(l)[ar] # output is an array
[e for e,m in zip(l, ar) if m]
[l[i] for i in np.where(ar)[0]]