Fix check for valid loggers in debug_callback

The code in `debug_callback` checking if the specified loggers were
valid was using a set equals operator when it should have been using a
subset operator.

Author: Jonathan Kamens

delete

@@ -22,7 +22,7 @@ def debug_callback(option, opt_str, value, parser):
     if value.lower() == 'all':
         loggers = all_loggers
     else:
-        if not set(loggers) == set(all_loggers):
+        if not set(loggers) <= set(all_loggers):
             parser.error('Valid debug targets: {0}'.format(
                     ", ".join(all_loggers)))
     for l in loggers:

expunge

@@ -28,7 +28,7 @@ def debug_callback(option, opt_str, value, parser):
     if value.lower() == 'all':
         loggers = all_loggers
     else:
-        if not set(loggers) == set(all_loggers):
+        if not set(loggers) <= set(all_loggers):
             parser.error('Valid debug targets: {0}'.format(
                     ", ".join(all_loggers)))
     for l in loggers:

lsdel

@@ -21,7 +21,7 @@ def debug_callback(option, opt_str, value, parser):
     if value.lower() == 'all':
         loggers = all_loggers
     else:
-        if not set(loggers) == set(all_loggers):
+        if not set(loggers) <= set(all_loggers):
             parser.error('Valid debug targets: {0}'.format(
                     ", ".join(all_loggers)))
     for l in loggers:

undelete

@@ -22,7 +22,7 @@ def debug_callback(option, opt_str, value, parser):
     if value.lower() == 'all':
         loggers = all_loggers
     else:
-        if not set(loggers) == set(all_loggers):
+        if not set(loggers) <= set(all_loggers):
             parser.error('Valid debug targets: {0}'.format(
                     ", ".join(all_loggers)))
     for l in loggers: