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I want to broaden this to 'external' programs. Will discuss.
Both versions appear to be trying to access non-existent configuration parameters.
Warning: configHandler.py - IdleConf.GetOption -
problem retrieving configuration option 'enabled'
from section 'pyflakes'.
returning default value: None
Warning: configHandler.py - IdleConf.GetOption -
problem retrieving configuration option 'command'
from section 'pyflakes'.
returning default value: None
v1. Trial on file with no warnings - need end of report summary like find in files so actually know program ran. Trial on file with warnings hangs Idle.
v2. Trying to enable pyflakes gives this
Traceback (most recent call last):
 File "F:\Python\dev4円\py34\lib\tkinter\__init__.py", line 1487, in __call__
 return self.func(*args)
 File "F:\Python\dev4円\py34\lib\idlelib\Checker.py", line 290, in ok
 self.close()
 File "F:\Python\dev4円\py34\lib\idlelib\Checker.py", line 296, in close
 self._checker.update_listbox()
AttributeError: 'function' object has no attribute 'update_listbox'