diff --git a/gpio.py b/gpio.py
index 7cdad5a..e3645be 100644
--- a/gpio.py
+++ b/gpio.py
@@ -1,22 +1,29 @@
-
+from os.path import islink, isfile
 class gpio:
 	def __init__(self, pin):
 		self.pin = pin
 
 	def export(self):
-		f = open("/sys/class/gpio/export", "w")
-		f.write(str(self.pin))
+		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):
-		f = open("/sys/class/gpio/unexport", "w")
-		f.write(str(self.pin))
+		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"):
-		f = open("/sys/class/gpio/gpio" + str(self.pin) + \
-			"/direction", "w")
-		f.write(direction)
+		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):
-		f = open("/sys/class/gpio/gpio" + str(self.pin) + \
-			"/value", "w")
-		f.write(str(value))
+		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))
+