import random


def get_randstr(length=1):
    """ return string of random picked up chars
    :param length: string length to return
    """
    chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz'
    retval = ''.join([random.choice(chars) for _ in range(length)])
    return retval