assaign a value to a certain list index code example

Example 1: list elements not in indices

import numpy as np
x=np.array(mylist)
mask=np.full(len(mylist),True,dtype=bool)
mask[idx]=False
y=x[mask]
z=x[~mask]
print(y,z)

Example 2: list elements not in indices

mask = np.ones(arr.size, dtype=bool)
mask[indexes] = False
result = arr[mask]