def METHOD_NAME(pin):
    """
    Shows the function of a GPIO channel.
    will return a value from: GPIO.INPUT, GPIO.OUTPUT, GPIO.SPI, GPIO.I2C, GPIO.HARD_PWM, GPIO.SERIAL, GPIO.UNKNOWN
    :param pin:
    :return: GPIO.INPUT, GPIO.OUTPUT, GPIO.SPI, GPIO.I2C, GPIO.HARD_PWM, GPIO.SERIAL, GPIO.UNKNOWN
    """
    return None