Regex in python (replace digits with # and remove all other characters)

I tried to replace every digit in a string with # and to remove all other digits. I not getting answer in list format.

import re
def replace(str):
    for i in str:
        if 48 <= ord(i) >= 57:
            print(i.replace(i, "#"))
        else:
            print(i.replace(i, " "))
str_1 = "adgf*^%12345"
replace(str_1)