from os.path import islink, isfile
class gpio:
	def __init__(self, pin):
		self.pin = pin

	def export(self):
		if not islink("/sys/class/gpio/gpio" + str(self.pin)):
			f = open("/sys/class/gpio/export", "w")
			f.write(str(self.pin))

	def unexport(self):
		if islink("/sys/class/gpio/gpio" + str(self.pin)):
			f = open("/sys/class/gpio/unexport", "w")
			f.write(str(self.pin))

	def direction(self, direction = "out"):
		if isfile("/sys/class/gpio/gpio" + str(self.pin) + \
				"/direction"):
			f = open("/sys/class/gpio/gpio" + str(self.pin) + \
				"/direction", "w")
			f.write(direction)

	def set(self, value = 0):
		if isfile("/sys/class/gpio/gpio" + str(self.pin) + \
				"/value"):
			f = open("/sys/class/gpio/gpio" + str(self.pin) + \
				"/value", "w")
			f.write(str(value))