stack size in def python code example

Example 1: fixed size list in python

L, R, answer = [0]*length, [0]*length, [0]*length

Example 2: non-words in python

import re

regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, second parameter is your input string
regex.sub('', 'ab3d*E')
#Out: 'abdE'