[Urwid] help with transient traceback: AttributeError: 'Text' object has no attribute '_cache_translation'

Mike McCracken mike.mccracken at canonical.com
Tue Jan 6 17:16:05 EST 2015


Hi, we're using urwid in our openstack installer project, and have run into
a transient traceback from inside urwid's cached rendering code that we're
having trouble reproducing.

I'm hoping that someone on here has seen it before - I didn't find anything
too useful from a google search, so it doesn't seem like a FAQ.

The traceback in question is at the end of this email, and is also tracked
in this bug:
https://github.com/Ubuntu-Solutions-Engineering/openstack-installer/issues/326
that project has all the relevant code, and I'm happy to try to explain
anything relevant about the code base.

Thanks in advance for any advice.

  File "/usr/share/openstack/cloudinstall/utils.py", line 66, in run
    super().run()
  File "/usr/lib/python3.4/threading.py", line 868, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/share/openstack/cloudinstall/core.py", line 411, in
begin_deployment_async
    self.begin_deployment()
  File "/usr/share/openstack/cloudinstall/core.py", line 447, in
begin_deployment
    self.deploy_using_placement()
  File "/usr/share/openstack/cloudinstall/core.py", line 594, in
deploy_using_placement
    err = self.try_deploy(charm_class)
  File "/usr/share/openstack/cloudinstall/core.py", line 637, in try_deploy
    mspec=mspec))
  File "/usr/share/openstack/cloudinstall/core.py", line 232, in
info_message
    "{}\N{HORIZONTAL ELLIPSIS}".format(message))
  File "/usr/lib/python3.4/contextlib.py", line 66, in __exit__
    next(self.gen)
  File "/usr/share/openstack/cloudinstall/core.py", line 76, in
status_context
    view.redraw_screen()
  File "/usr/share/openstack/cloudinstall/core.py", line 267, in
redraw_screen
    self.loop.draw_screen()
  File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 565, in
draw_screen
    canvas = self._topmost_widget.render(self.screen_size, focus=True)
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 141, in
cached_render
    canv = fn(self, size, focus=focus)
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 1750, in
render
    canv = get_delegate(self).render(size, focus=focus)
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 141, in
cached_render
    canv = fn(self, size, focus=focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1058, in
render
    (maxcol, maxrow), focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1018, in
frame_top_bottom
    self.focus_part=='header' and focus)
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 201, in
cached_rows
    return fn(self, size, focus)
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1568, in
rows
    return sum(self.get_item_rows(size, focus))
  File "/usr/lib/python3/dist-packages/urwid/container.py", line 1470, in
get_item_rows
    focus=focus and self.focus_item == w))
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 201, in
cached_rows
    return fn(self, size, focus)
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 1021, in rows
    return len(self.get_line_translation(maxcol))
  File "/usr/lib/python3/dist-packages/urwid/widget.py", line 1037, in
get_line_translation
    return self._cache_translation
AttributeError: 'Text' object has no attribute '_cache_translation'
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