>>> string = "Special $#! characters spaces 888323" >>> ''.join(e for e in string if e.isalnum()) 'Specialcharactersspaces888323'
alphanumeric = [character for character in a_string if character.isalnum()]
import re my_list= ["on@3", "two#", "thre%e"] print [re.sub('[^a-zA-Z0-9]+', '', _) for _ in my_list]