Python function to validate a password string

validate_password.py

import re

# Taking from https://gist.github.com/psjinx/5722079#file-utils-py 
MINIMUM_PASSWORD_LENGTH = 8
REGEX_VALID_PASSWORD = (
    ## Don't allow any spaces, e.g. '\t', '\n' or whitespace etc.
    r'^(?!.*[\s])'
    ## Check for a digit
    '((?=.*[\d])'
    ## Check for an uppercase letter
    '(?=.*[A-Z])'
    ## check for special characters. Something which is not word, digit or
    ## space will be treated as special character
    '(?=.*[^\w\d\s])).'
    ## Minimum 8 characters
    '{' + str(MINIMUM_PASSWORD_LENGTH) + ',}$')
 
 
def validate_password(password):
    if re.match(REGEX_VALID_PASSWORD, password):
        return True
    return False