How do I create lists in a list in Python? Is it possible?

Question

How to make list each character of list? like this:

li = ['A','B','C']

into :

li = [['A'],['B'],['C']]

Answer 1

See "list comprehension".

It is simply,

[[i] for i in ['A', 'B', 'C']]

or more generally,

[f(x) for x in list_name]