How do i convert the entries within an array into arrays in python?

Question

I need to convert a numpy array as follows:

[1,1,1,1] -> [[1],[1],[1],[1]]

Answer 1

Use np.reshape:

import numpy as np

values = np.random.randint(1, 10, 10)
print(values)
values = values.reshape((-1, 1))
print(values)

# Before reshaping
[5 9 8 1 2 6 2 2 9 8]

# After reshaping
[[5]
 [9]
 [8]
 [1]
 [2]
 [6]
 [2]
 [2]
 [9]
 [8]]

Using -1 tells NumPy that the new shape should be compatible with the original shape (i.e. it should figure out the value for that dimension based on the number of elements in the array).