diff --git a/lib/matplotlib/legend.py b/lib/matplotlib/legend.py
index d0590824ad84..ce0eaa056815 100644
--- a/lib/matplotlib/legend.py
+++ b/lib/matplotlib/legend.py
@@ -1173,13 +1173,26 @@ def _get_legend_handles(axs, legend_handler_map=None):
def _get_legend_handles_labels(axs, legend_handler_map=None):
"""Return handles and labels for legend."""
+ log = logging.getLogger(__name__)
handles = []
labels = []
+ all_underscored = None
for handle in _get_legend_handles(axs, legend_handler_map):
label = handle.get_label()
- if label and not label.startswith('_'):
- handles.append(handle)
- labels.append(label)
+ if label:
+ if not label.startswith('_'):
+ handles.append(handle)
+ labels.append(label)
+ all_underscored = False
+ else:
+ all_underscored = True if all_underscored is not False \
+ else False
+
+ if all_underscored is True:
+ log.warning("All labels starting with an underscore were "
+ "detected. Note that artists whose label start with an "
+ "underscore are ignored when legend() is called with "
+ "no argument")
return handles, labels
@@ -1254,9 +1267,7 @@ def _parse_legend_args(axs, *args, handles=None, labels=None, **kwargs):
handles, labels = _get_legend_handles_labels(axs, handlers)
if not handles:
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.")
+ "No handles with labels found to put in legend.")
# One argument. User defined labels - automatic handle detection.
elif len(args) == 1:
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