Python: How to reverse an objects string function in python

For example, I have a class Wall (doesnt have an init)

if a = Wall()

and str(a) outputs: '#'

if i have a string containing ‘####’

how can i turn that string into a list, that has the name of the class object like this:
[Wall(), Wall(), Wall(), Wall()]

>Solution :

You can use a list comprehension with a filtering clause:

walls = [Wall() for char in string
         if char == '#']