minor changes on line spacing and similar trivial stuff

interface_handler.py

@@ -52,6 +52,7 @@ class Interface_handler:
         self.xml_reader = xml_reader
         self.init_gpio()
 
+
     def init_gpio(self):
         """initialises the GPIO pins
         """
@@ -100,9 +101,9 @@ class Interface_handler:
                 })
             else: #throw error for protocols without write functionality
                 raise ValueError("you can not read from device %s" % device_name)
-
         return returnValues
 
+
     def write(self, device_name:str, value):
         """writes a value to all the pins of a device