8000 Backport PR #14279 on branch v3.1.x (In case fallback to Agg fails, let the exception propagate out.) by meeseeksmachine · Pull Request #14284 · matplotlib/matplotlib · GitHub
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Backport PR #14279 on branch v3.1.x (In case fallback to Agg fails, let the exception propagate out.) #14284

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Merged
merged 1 commit into from
May 21, 2019
Merged

Backport PR #14279 on branch v3.1.x (In case fallback to Agg fails, let the exception propagate out.) #14284

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10 changes: 8 additions & 2 deletions lib/matplotlib/pyplot.py
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Original file line number Diff line number Diff line change
Expand Up @@ -198,15 +198,21 @@ def switch_backend(newbackend):
# Don't try to fallback on the cairo-based backends as they each have
# an additional dependency (pycairo) over the agg-based backend, and
# are of worse quality.
for candidate in ["macosx", "qt5agg", "qt4agg", "gtk3agg", "tkagg",
"wxagg", "agg"]:
for candidate in [
686A "macosx", "qt5agg", "qt4agg", "gtk3agg", "tkagg", "wxagg"]:
try:
switch_backend(candidate)
except ImportError:
continue
else:
rcParamsOrig['backend'] = candidate
return
else:
# Switching to Agg should always succeed; if it doesn't, let the
# exception propagate out.
switch_backend("agg")
rcParamsOrig["backend"] = "agg"
return

backend_name = (
newbackend[9:] if newbackend.startswith("module://")
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