code: def encrypt(password='password', salt=None):
      
      if not salt:
          salt = str(datetime.utcnow())
  
      try:
          #  available for python 2.7.8 and python 3.4+
          dk = hashlib.pbkdf2_hmac('sha1', password.encode(), salt.encode(), 100000)
          hexdigest = binascii.hexlify(dk).decode('utf-8')
      except AttributeError:
          # see https://pymotw.com/2/hashlib/
          # see https://docs.python.org/release/2.5/lib/module-hashlib.html
          dk = hashlib.sha1()
          dk.update(password.encode() + salt.encode())
          hexdigest = dk.hexdigest()
      return hexdigest
docs: Return SHA1 hexdigest of a password (optionally salted with a string).