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Backport PR #20956 on branch v3.5.x (Make warning for no-handles legend more explicit.) #20958

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Merged
merged 1 commit into from
Sep 1, 2021
Merged

Backport PR #20956 on branch v3.5.x (Make warning for no-handles legend more explicit.) #20958

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5 changes: 4 additions & 1 deletion lib/matplotlib/legend.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1224,7 +1224,10 @@ def _parse_legend_args(axs, *args, handles=None, labels=None, **kwargs):
elif len(args) == 0:
handles, labels = _get_legend_handles_labels(axs, handlers)
if not handles:
log.warning('No handles with labels found to put in legend.')
log.warning(
"No artists with labels found to put in legend. Note that "
"artists whose label start with an underscore are ignored "
"when legend() is called with no argument.")

# One argument. User defined labels - automatic handle detection.
elif len(args) == 1:
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