Mailman 3 April 2021 - Matplotlib-devel

Query
by Aditya Gupta April 26, 2021

April 26, 2021

Dear sir, I Aditya Kumar Gupta , I am 1st year student at VIT and wanted to contribute in your matplotlib project . Can you tell me how I can contribute in this in a better way?

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Major refactor of Axes internals just merged
by Thomas Caswell April 3, 2021

April 3, 2021

Folks, We just merged a major refactor of how the Axes object stores its children [1]. Previously the children were stored across several lists by type and were sorted and merged at draw time (which is the source of the long standing bug [2]) whereas now there is a single list of children and back-compatibility shims to access the children by type. We expect this to be very good thing going forward, however in the short time we expect that there are going to be some unforeseen consequences due to this change. Because of this, we held of on merging this until after we got 3.4 release so that we have ~6 months of this being on the default branch before it is released. If you have any issues please reach out to us! It is unlikely that we will revert this change, but we will definitely extend and improve the shims as needed :) Thank you to Elliott for getting this work done! Tom [1] https://github.com/matplotlib/matplotlib/pull/18216 [2] https://github.com/matplotlib/matplotlib/issues/1622 -- Thomas Caswell tcaswell(a)gmail.com

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ANN: mplcairo 0.4 release
by Antony Lee April 2, 2021

April 2, 2021

Dear all, I am pleased to announce the release of mplcairo 0.4. mplcairo is a Matplotlib backend based on the well-known cairo library, supporting output to both raster (including interactively) and vector formats. In other words, it provides the functionality of Matplotlib's {,qt5,gtk3,wx,tk,macos}{agg,cairo}, pdf, ps, and svg backends. Per Matplotlib's standard API, the backend can be selected by calling matplotlib.use("module://mplcairo.qt") or setting your MPLBACKEND environment variable to `module://mplcairo.qt` for Qt5, and similarly for other toolkits. mplcairo 0.4 adds support for Matplotlib 3.4, support for retrieving underlying cairo contexts, as well as the usual bugfixes over 0.3. Enjoy, Antony Lee

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mpl-3.4 vs. mplcairo?
by Neal Becker April 2, 2021

April 2, 2021

Just updated out-of-date python modules including mpl. Now if I try a simple plot I get: -------------- In [2]: Traceback (most recent call last): File "/home/nbecker/.local/lib/python3.9/site-packages/mplcairo/qt.py", line 12, in paintEvent if self._update_dpi(): AttributeError: 'FigureCanvasQTCairo' object has no attribute '_update_dpi' ----------- if using backend: module://mplcairo.qt, which is my default. Removing this from matplotlibrc the plot works fine. fedora 33 python 3.9.2 mplcairo 0.3.post38+g3bcf15c matplotlib 3.4.0 PyQt5 5.15.4 PyQt5-Qt5 5.15.2 -- Those who don't understand recursion are doomed to repeat it

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