def random_letters(n):
    """
    Generate a random string from a-zA-Z
    :param n: length of the string
    :return: the random string
    """
    return ''.join(random.SystemRandom().choice(string.ascii_letters) for _ in range(n))
def random_letters(n):
    """
    Generate a random string from a-zA-Z
    :param n: length of the string
    :return: the random string
    """
    return ''.join(random.SystemRandom().choice(string.ascii_letters) for _ in range(n))
def random_letters ( n ) : return '' . join ( random . SystemRandom ( ) . choice ( string . ascii_letters ) for _ in range ( n ) )
Generate a random string from a-zA-Z
    :param n: length of the string
    :return: the random string
Generate a random string from a - zA - Z : param n : length of the string : return : the random string