added edit_config function

cage_func.py

@@ -172,20 +172,33 @@ class ArduinoCtrl(Arduino):
             self.digitalWrite(pin, "LOW")
 
 
-def read_config(section, key):  # attempt to read config file
+def read_config(section, key):  # read specific value from config file
     # ToDo (optional) better error handling
-    file = g.CONFIG_FILE
     config_object = ConfigParser()
     try:
-        config_object.read(file)
+        config_object.read(g.CONFIG_FILE)
         section_obj = config_object[section]
         return section_obj[key]
     except KeyError as e:
-        ui_print("Error while reading config file: e")
+        ui_print("Error while reading config file:", e)
         raise KeyError("Could not find key", key, "in config file.")
 
 
-def create_default_config(file):
+def edit_config(section, key, value):  # edit specific value in config file
+    config_object = ConfigParser()
+    try:
+        config_object.read(g.CONFIG_FILE)
+        section_obj = config_object[section]
+        section_obj[key] = str(value)
+
+        with open(g.CONFIG_FILE, 'w') as conf:  # Write changes back to file
+            config_object.write(conf)
+    except KeyError as e:
+        ui_print("Error while editing config file:", e)
+        raise KeyError("Could not find key", key, "in config file.")
+
+
+def create_default_config(file):  # create config file from default values (stored in globals.py)
     config = ConfigParser()
 
     i = 0

globals.py

@@ -17,12 +17,6 @@ AXIS_NAMES = ["X-Axis", "Y-Axis", "Z-Axis"]
 
 global CONFIG_FILE
 
-'''global COIL_CONST
-global RESISTANCES
-global MAX_WATTS
-global MAX_VOLTS
-global AMBIENT_FIELD'''
-
 global XY_PORT
 global Z_PORT
 global RELAY_PINS