1 files changed, 19 insertions, 6 deletions
diff --git a/bin/level_calc.py b/bin/level_calc.py
index de52998..4dc1356 100755
--- a/bin/level_calc.py
+++ b/bin/level_calc.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+from __future__ import print_function
+
 import math
 
 interactive = False
@@ -41,6 +43,9 @@ def main(args):
         chan = Empty()
         chan.pwm_max = 255
         ask(questions_per_channel, chan)
+        chan.type = chan.type.upper()
+        if chan.type not in ('7135', 'FET'):
+            raise ValueError('Invalid channel type: %s' % (chan.type,))
         channels.append(chan)
 
     # calculate total output of all previous channels
@@ -54,8 +59,8 @@ def main(args):
     multi_pwm(answers, channels)
 
     if interactive: # Wait on exit, in case user invoked us by clicking an icon
-        print 'Press Enter to exit:'
-        raw_input()
+        print('Press Enter to exit:')
+        input_text()
 
 
 class Empty:
@@ -72,7 +77,7 @@ def multi_pwm(answers, channels):
             lm_max = channels[-1].lm_max
         else:
             # this would be a stupid driver design
-            raise ValueError, "FET channel isn't the most powerful?"
+            raise ValueError("FET channel isn't the most powerful?")
 
     visual_min = invpower(lm_min)
     visual_max = invpower(lm_max)
@@ -96,7 +101,7 @@ def multi_pwm(answers, channels):
                 # This shouldn't happen, the FET is assumed to be the highest channel
                 if channel.type == 'FET':
                     # this would be a stupid driver design
-                    raise ValueError, "FET channel isn't the most powerful?"
+                    raise ValueError("FET channel isn't the most powerful?")
 
                 # Handle FET turbo specially
                 if (i == (answers.num_levels - 1)) \
@@ -149,8 +154,8 @@ def get_value(text, default, args):
     else:
         global interactive
         interactive = True
-        print text, '(%s)' % (default),
-        result = raw_input()
+        print(text + ' (%s) ' % (default), end='')
+        result = input_text()
     result = result.strip()
     return result
 
@@ -171,6 +176,14 @@ def invpower(x):
     #return math.log(x, 2.0)
 
 
+def input_text():
+    try:
+        value = raw_input()  # python2
+    except NameError:
+        value = input()  # python3
+    return value
+
+
 if __name__ == "__main__":
     import sys
     main(sys.argv[1:])