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Fix PyPy wheels and tests - #20848
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tacaswell
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PyPy does not correctly define `PyErr_SetFromWindowsErr`: https://foss.heptapod.net/pypy/pypy/-/issues/3533
These tests look at reference counts of objects, which are meaningless for PyPy (and also Jython).
PyPy adds an additional frame for `functools.wraps`, with `_functools` as the name, which causes the code to decide we're no longer in Matplotlib code too early, and not find `print_figure`. This causes warnings about unexpected arguments.
anntzer
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+/- comment on docstrings
In CPython, `inspect.getdoc` returns some default string for `__init__`, but on PyPy, it returns None, when using `-OO`. https://foss.heptapod.net/pypy/pypy/-/issues/3534
It does not support calls to Tkinter from different threads: https://foss.heptapod.net/pypy/pypy/-/issues/1929
Some of these worked (by fluke?) in CPython, but didn't work in PyPy. The NumPy function ensures GC is run enough times on PyPy to be really cleared.
This is necessary to get the latest PyPy, which implements `METH_FASTCALL`.
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PR Summary
Test build of wheels is here: https://github.com/QuLogic/matplotlib/actions/runs/1137857541
Fixes #20637.
This also fixes all tests except for the
Animationcleanup ones, which may be a bug in PyPy.Should we enable testing on PyPy in CI? Note, it is quite a bit slower for me, but I don't know how long it will take on CI.
Fixes #19160.
PR Checklist
pytestpasses).flake8on changed files to check).flake8-docstringsand runflake8 --docstring-convention=all).doc/users/next_whats_new/(follow instructions in README.rst there).doc/api/next_api_changes/(follow instructions in README.rst there).