first attempt at error messages

cage_func.py

@@ -7,6 +7,7 @@ import numpy as np
 import serial
 import traceback
 from tkinter import *
+from tkinter import messagebox
 from configparser import ConfigParser
 
 
@@ -198,26 +199,39 @@ def read_config(section, key):  # read specific value from config file
         raise KeyError("Could not find key", key, "in config file.")
 
 
-def edit_config(section, key, value):  # edit specific value in config file
+def edit_config(section, key, value, override=False):  # edit specific value in config file
     config_object = ConfigParser()  # initialize config parser
+    value_ok = False
     # Value checking:
     # ToDo: make pop-up warning messages that can be waived
     try:
         if section in g.AXIS_NAMES:  # only check numerical values
             max_value = g.default_arrays[key][1][g.AXIS_NAMES.index(section)]  # get max value
-            min_value = g.default_arrays[key][2][g.AXIS_NAMES.index(section)]
+            min_value = g.default_arrays[key][2][g.AXIS_NAMES.index(section)]  # get min value
             if value > max_value:
-                raise ValueError("Attempted to write too high value for", section, key, "to config file:",
-                                 value, ", max.", max_value, "allowed. Excessive values may damage equipment!")
+                message = "Attempted to write too high value for {s} {k} to config file:\n" \
+                          "{v}, max. {mv} allowed. Excessive values may damage equipment!\n" \
+                          "Do you really want to use this value?".format(s=section, k=key, v=value, mv=max_value)
+                raise ValueError(message)
             elif value < min_value:
-                raise ValueError("Attempted to write too low value for", section, key, "to config file:",
-                                 value, ", max.", max_value, "allowed. Excessive values may damage equipment!")
+                message = "Attempted to write too low value for {s} {k} to config file:\n" \
+                          "{v}, max. {mv} allowed. Excessive values may damage equipment!\n" \
+                          "Do you really want to use this value?".format(s=section, k=key, v=value, mv=min_value)
+                raise ValueError(message)
+            else:
+                value_ok = True
     except KeyError as e:
         ui_print("Error while editing config file:", e)
         raise KeyError("Could not find section", section, "in config file.")
     except ValueError as e:  # value too high/low
-        ui_print(e)
-    else:  # no errors so far
+        value_ok = False
+        # display pop-up message to ask user if he really wants the value
+        answer = messagebox.askquestion("Value out of bounds", e)  # becomes 'yes' or 'no' depending on user choice
+        if answer == 'yes': override = True
+        else: override = False
+    else:  # no errors
+        value_ok = True
+    if value_ok or override:  # value is ok or user has chosen to use it anyway
         try:
             config_object.read(g.CONFIG_FILE)  # open config file
             section_obj = config_object[section]  # get relevant section

globals.py

@@ -38,6 +38,3 @@ default_ports = {
     "xy_port": "COM1",  # Serial port where PSU for X- and Y-Axes is connected
     "z_port": "COM2",  # Serial port where PSU for Z-Axis is connected
 }
-maximums = {
-
-}