diff --git a/lib/matplotlib/axes/_base.py b/lib/matplotlib/axes/_base.py
index ae2e0c34141e..3570c4cf3d3a 100644
--- a/lib/matplotlib/axes/_base.py
+++ b/lib/matplotlib/axes/_base.py
@@ -403,12 +403,53 @@ def _makefill(self, x, y, kw, kwargs):
return seg, kwargs
def _plot_args(self, tup, kwargs, return_kwargs=False):
+ """
+ Process the arguments of ``plot([x], y, [fmt], **kwargs)`` calls.
+
+ This processes a single set of ([x], y, [fmt]) parameters; i.e. for
+ ``plot(x, y, x2, y2)`` it will be called twice. Once for (x, y) and
+ once for (x2, y2).
+
+ x and y may be 2D and thus can still represent multiple datasets.
+
+ For multiple datasets, if the keyword argument *label* is a list, this
+ will unpack the list and assign the individual labels to the datasets.
+
+ Parameters
+ ----------
+ tup : tuple
+ A tuple of the positional parameters. This can be one of
+
+ - (y,)
+ - (x, y)
+ - (y, fmt)
+ - (x, y, fmt)
+
+ kwargs : dict
+ The keyword arguments passed to ``plot()``.
+
+ return_kwargs : bool
+ If true, return the effective keyword arguments after label
+ unpacking as well.
+
+ Returns
+ -------
+ result
+ If *return_kwargs* is false, a list of Artists representing the
+ dataset(s).
+ If *return_kwargs* is true, a list of (Artist, effective_kwargs)
+ representing the dataset(s). See *return_kwargs*.
+ The Artist is either `.Line2D` (if called from ``plot()``) or
+ `.Polygon` otherwise.
+ """
if len(tup) > 1 and isinstance(tup[-1], str):
- linestyle, marker, color = _process_plot_format(tup[-1])
- tup = tup[:-1]
+ # xy is tup with fmt stripped (could still be (y,) only)
+ *xy, fmt = tup
+ linestyle, marker, color = _process_plot_format(fmt)
elif len(tup) == 3:
raise ValueError('third arg must be a format string')
else:
+ xy = tup
linestyle, marker, color = None, None, None
# Don't allow any None value; these would be up-converted to one
@@ -417,16 +458,16 @@ def _plot_args(self, tup, kwargs, return_kwargs=False):
raise ValueError("x, y, and format string must not be None")
kw = {}
- for k, v in zip(('linestyle', 'marker', 'color'),
- (linestyle, marker, color)):
- if v is not None:
- kw[k] = v
-
- if len(tup) == 2:
- x = _check_1d(tup[0])
- y = _check_1d(tup[-1])
+ for prop_name, val in zip(('linestyle', 'marker', 'color'),
+ (linestyle, marker, color)):
+ if val is not None:
+ kw[prop_name] = val
+
+ if len(xy) == 2:
+ x = _check_1d(xy[0])
+ y = _check_1d(xy[1])
else:
- x, y = index_of(tup[-1])
+ x, y = index_of(xy[-1])
if self.axes.xaxis is not None:
self.axes.xaxis.update_units(x)
@@ -445,10 +486,10 @@ def _plot_args(self, tup, kwargs, return_kwargs=False):
y = y[:, np.newaxis]
if self.command == 'plot':
- func = self._makeline
+ make_artist = self._makeline
else:
kw['closed'] = kwargs.get('closed', True)
- func = self._makefill
+ make_artist = self._makefill
ncx, ncy = x.shape[1], y.shape[1]
if ncx > 1 and ncy > 1 and ncx != ncy:
@@ -465,8 +506,8 @@ def _plot_args(self, tup, kwargs, return_kwargs=False):
else:
labels = [label] * n_datasets
- result = (func(x[:, j % ncx], y[:, j % ncy], kw,
- {**kwargs, 'label': label})
+ result = (make_artist(x[:, j % ncx], y[:, j % ncy], kw,
+ {**kwargs, 'label': label})
for j, label in enumerate(labels))
if return_kwargs:
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