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Matplotlib 3.8 test warning #2277

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merged 2 commits into from
Oct 20, 2023
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Matplotlib 3.8 test warning #2277

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185bb4f
close plot
lgolston Oct 18, 2023
696031b
use callback
lgolston Oct 19, 2023
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1 change: 1 addition & 0 deletions lib/cartopy/tests/mpl/conftest.py
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@ def mpl_test_cleanup(request):
with ExitStack() as stack:
# At exit, close all open figures and switch backend back to original.
stack.callback(plt.switch_backend, plt.get_backend())
stack.callback(plt.close, 'all')
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Does it matter whether we close all before or after the switch backend?

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Yes, if line 17 and 18 are swapped the warning is still given. Since the stack goes in reverse order, I think the flow is that on exit the plot is closed, then backend is switched to original.


# Run each test in a context manager so that state does not leak out
plt.switch_backend('Agg')
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