On Mar 6, 3:02 pm, Alasdair <amc...@gmail.com> wrote:
> However, it doesn't work. In console mode show_parent() should turn
> the display of parents on, and hide_parent() should turn it off. It
> seems to work once - but not again. That is, parent display can be
> turned on, and then off, but not on again - show_parent() has no
> effect after one "cycle". I'm not quite sure what's going on - my
> python knowledge is limited. And sometimes when parent display is on,
> hide_parent() has no effect.
>
> Any ideas?
This is because .set_hook() pushes your function onto a list of
handlers; the first handler in the list that does not raise a TryNext
exception is used. So you keep adding more and more copies of
repr_and_parent and repr_only onto the list.
Here's a variant that works for me (in limited testing).
import IPython
from IPython import ipapi
from IPython.genutils import Term
from pprint import PrettyPrinter
pformat = PrettyPrinter().pformat
_show_parent_mode = False
def _maybe_show_parent(self, arg):
if _show_parent_mode and hasattr(arg, 'parent'):
try:
print >>Term.cout, "%s\n\nParent: %s"%(repr(arg),repr
(arg.parent()))
return
except:
pass
raise ipapi.TryNext
ipapi.get().set_hook("result_display", _maybe_show_parent)
def show_parent():
global _show_parent_mode
_show_parent_mode = True
def hide_parent():
global _show_parent_mode
_show_parent_mode = False
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