issue computing repr of Figure
#115
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And there is a timing race here, if you run the second cell with in a second of the first it works ok as the timeout on displaying the "I'm drawing" cursor is not hit. I am testing with master branch IPython, Matplotlib, and ipympl. |
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I am not reproducing that issue locally at the moment. Will look more into it tomorrow. |
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I think this may require mpl master to reproduce... |
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the problem is still there. Looking at @tacaswell link, there seems to be a wired Matplotlib thing "during a save operation we temporarily remove the manager" , that may explain other random un-correct display I have on the widget |
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windows 10 / Python - 3.7.5, and and |
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reverting #5 makes the thing work again. can it be done as a temporary solution ? |
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I think I hit this bug, but now even calling the save right after doesn't help. @tacaswell @SylvainCorlay @stonebig any ideas? |
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on a notebook with a %matplotlib widget at first encounter, it seems ok. if before that moment there was a %matplotlib inline, it's not ok. (on unbiased current version of mpl and ipympl) |
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I only used |
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I have the same problem with %matplotlib widget, and I do not want to switch to inline plotting. Is there a work around? |
I also had the same issue and downgraded my |
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I think this is fixed with mpl 3.2.1 |
After updating mpl to version 3.3.0 (and also other packages) I thought it would be gone, but now I have a different exception. My traceback reads as follows: I haven't seen this AttributeError before. My packages, in case it's helpful: |
So while mpl 3.3.0 introduced another different exception, mpl 3.2.2. also works. |
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Due to matplotlib/matplotlib#10292 during a save operation we temporarily remove the manager
and you will get a traceback that looks like:
--------------------------------------------------------------------------- AttributeError Traceback (most recent call last) ~/.virtualenvs/bleeding/lib/python3.9/site-packages/IPython/core/formatters.py in __call__(self, obj) 339 pass 340 else: --> 341 return printer(obj) 342 # Finally look for special method names 343 method = get_real_method(obj, self.print_method) ~/.virtualenvs/bleeding/lib/python3.9/site-packages/IPython/core/pylabtools.py in <lambda>(fig) 242 243 if 'png' in formats: --> 244 png_formatter.for_type(Figure, lambda fig: print_figure(fig, 'png', **kwargs)) 245 if 'retina' in formats or 'png2x' in formats: 246 png_formatter.for_type(Figure, lambda fig: retina_figure(fig, **kwargs)) ~/.virtualenvs/bleeding/lib/python3.9/site-packages/IPython/core/pylabtools.py in print_figure(fig, fmt, bbox_inches, **kwargs) 126 127 bytes_io = BytesIO() --> 128 fig.canvas.print_figure(bytes_io, **kw) 129 data = bytes_io.getvalue() 130 if fmt == 'svg': ~/source/p/mpl-master/lib/matplotlib/backend_bases.py in print_figure(self, filename, dpi, facecolor, edgecolor, orientation, format, bbox_inches, **kwargs) 2058 if bbox_inches: 2059 if bbox_inches == "tight": -> 2060 renderer = _get_renderer( 2061 self.figure, 2062 functools.partial( ~/source/p/mpl-master/lib/matplotlib/backend_bases.py in _get_renderer(figure, print_method) 1546 with cbook._setattr_cm(figure, draw=_draw): 1547 try: -> 1548 print_method(io.BytesIO()) 1549 except Done as exc: 1550 figure._cachedRenderer, = exc.args ~/source/p/mpl-master/lib/matplotlib/backends/backend_agg.py in print_png(self, filename_or_obj, metadata, pil_kwargs, *args, **kwargs) 533 534 else: --> 535 FigureCanvasAgg.draw(self) 536 renderer = self.get_renderer() 537 with cbook._setattr_cm(renderer, dpi=self.figure.dpi), \ ~/source/p/mpl-master/lib/matplotlib/backends/backend_agg.py in draw(self) 391 self.renderer = self.get_renderer(cleared=True) 392 # Acquire a lock on the shared font cache. --> 393 with RendererAgg.lock, \ 394 (self.toolbar._wait_cursor_for_draw_cm() if self.toolbar 395 else nullcontext()): ~/source/other_source/cpython/Lib/contextlib.py in __enter__(self) 111 del self.args, self.kwds, self.func 112 try: --> 113 return next(self.gen) 114 except StopIteration: 115 raise RuntimeError("generator didn't yield") from None ~/source/p/mpl-master/lib/matplotlib/backend_bases.py in _wait_cursor_for_draw_cm(self) 2732 if self._draw_time - last_draw_time > 1: 2733 try: -> 2734 self.set_cursor(cursors.WAIT) 2735 yield 2736 finally: ~/source/p/mpl-master/lib/matplotlib/backends/backend_webagg_core.py in set_cursor(self, cursor) 379 def set_cursor(self, cursor): 380 if cursor != self.cursor: --> 381 self.canvas.send_event("cursor", cursor=cursor) 382 self.cursor = cursor 383 ~/source/p/mpl-master/lib/matplotlib/backends/backend_webagg_core.py in send_event(self, event_type, **kwargs) 344 345 def send_event(self, event_type, **kwargs): --> 346 self.manager._send_event(event_type, **kwargs) 347 348 AttributeError: 'NoneType' object has no attribute '_send_event'I thought we should be going through https://github.com/matplotlib/matplotlib/blob/59b5e0e873dd3420758498c90b15f7f70cb007da/lib/matplotlib/figure.py#L403-L408 but it looks like we are going trough a lambda from IPython core....
I think this could legitimately go against IPython, Matplotlib, or here. Leaving here as the "middle ground" ;)
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