def random_str(Nchars=6, randstrbase='0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'):
    """Return a random string of <Nchars> characters. Characters are sampled
    uniformly from <randstrbase>.
    """
    return ''.join([randstrbase[random.randint(0, len(randstrbase) - 1)] for i in range(Nchars)])
def random_str ( Nchars = 6 , randstrbase = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ' ) : return '' . join ( [ randstrbase [ random . randint ( 0 , len ( randstrbase ) - 1 ) ] for i in range ( Nchars ) ] )
Return a random string of <Nchars> characters. Characters are sampled
    uniformly from <randstrbase>.