python类方法错误-未绑定需要实例

Python Class Method Error — unbound requires instance

我打电话来

1	Hardware.gpio_active(True)

这是我的硬件课程：

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import os
import glob
import time
import RPi.GPIO as GPIO

#class to manage hardware -- sensors, pumps, etc
class Hardware(object):
#global vars for sensor
base_dir = '/sys/bus/w1/devices/'
device_folder = glob.glob(base_dir + '28*')[0]
device_file = device_folder + '/w1_slave'

#global var for program
temp_unit = 'F' #temperature unit, choose C for Celcius or F for F for Farenheit
gpio_pin = 17

#function to enable GPIO
@classmethod
def gpio_active(active):
#system params for sensor
if active is True:
os.system('modprobe w1-gpio')
os.system('modprobe w1-therm')
GPIO.setmode(GPIO.BCM)
GPIO.setup(Hardware.gpio_pin, GPIO.OUT)
print 'activating GPIO'
else:
print 'deactivating GPIO'
GPIO.cleanup()

我得到这个错误：

TypeError: unbound method gpio_active() must be called with Hardware
instance as first argument (got bool instance instead)

我不想传递一个实例——我希望gpio_active()基本上充当一个函数，但保留对静态类变量的可访问性。我以为这就是@classmethod的目的。我在@staticmethod上也有同样的错误。

我误解了什么？