Random string in Python

from whrandom import choice
import string

def GenPasswd():
   chars = string.letters + string.digits
   for i in range(8):
       newpasswd = newpasswd + choice(chars)
   return newpasswd

def GenPasswd2(length=8, chars=string.letters + string.digits):
   return ''.join([choice(chars) for i in range(length)])