How to split a list that has ONLY ONE integer value in Python?

Question

I want to split a value in a list and make it two values.

arr = [10]

The array should turn in to:

arr = [1,0]

Answer 1

Use list comprehension with two iterations:

>>> [int(x) if x.isdigit() else x for y in arr for x in str(y)]
[1, 0]
>>>