extracted device finding to a method

hpib.py

@@ -35,19 +35,22 @@ class PrologixGpibUsb(PortDevice):
         self._initialize_prologix_gpi()
 
         if findDevices:
-            self._devices = []
-            for self._hpib_address in range(0, 31):
-                commandStr = "++addr " + str(self._hpib_address) + chr(10) + \
-                             "*idn?" + chr(10) + \
-                             "++read" + chr(10)
-                self._serialPort.write(commandStr)
-                returnStr = self._serialPort.readline()
-                if returnStr != "":
-                    self._devices += [self._hpib_address, returnStr]
+            self._find_devices()
         else:
             self._devices = "Not scanned."
         self._hpib_address = -1
 
+    def _find_devices(self):
+        self._devices = []
+        for self._hpib_address in range(0, 31):
+            commandStr = "++addr " + str(self._hpib_address) + chr(10) + \
+                         "*idn?" + chr(10) + \
+                         "++read" + chr(10)
+            self._serialPort.write(commandStr)
+            returnStr = self._serialPort.readline()
+            if returnStr != "":
+                self._devices += [self._hpib_address, returnStr]
+
     def _initialize_prologix_gpi(self):
         self._serialPort.write("++savecfg 0" + chr(10))
         self._serialPort.write("++auto 0" + chr(10))