BUG: Fix Ability to set both color and style in pandas plotting

doc/source/whatsnew/v3.0.0.rst

@@ -634,6 +634,7 @@ Plotting
 - Bug in :meth:`.DataFrameGroupBy.boxplot` failed when there were multiple groupings (:issue:`14701`)
 - Bug in :meth:`DataFrame.plot` that causes a shift to the right when the frequency multiplier is greater than one. (:issue:`57587`)
 - Bug in :meth:`Series.plot` with ``kind="pie"`` with :class:`ArrowDtype` (:issue:`59192`)
+- Bug in :meth:`core._validate_color_args` raising ``ValueError`` when set both color and style in plt.plot.line (:issue:`59461`)
 
 Groupby/resample/rolling
 ^^^^^^^^^^^^^^^^^^^^^^^^

pandas/plotting/_matplotlib/core.py

@@ -455,6 +455,8 @@ def _validate_color_args(self, color, colormap):
  styles = self.style
  else:
  styles = [self.style]
+ if isinstance(self.style, dict):
+ styles = [self.style[col] for col in self.columns if col in self.style]
  # need only a single match
  for s in styles:
  if _color_in_style(s):

pandas/tests/plotting/frame/test_frame_color.py

@@ -95,6 +95,18 @@ def test_color_and_marker(self, color, expected):
  assert all(i.get_linestyle() == "--" for i in ax.lines)
  assert all(i.get_marker() == "d" for i in ax.lines)
 
+ def test_color_and_style(self):
+ color = {"g": "black", "h": "brown"}
+ style = {"g": "-", "h": "--"}
+ expected_color = ["black", "brown"]
+ expected_style = ["-", "--"]
+ df = DataFrame({"g": [1, 2], "h": [2, 3]}, index=[1, 2])
+ ax = df.plot.line(color=color, style=style)
+ color = [i.get_color() for i in ax.lines]
+ style = [i.get_linestyle() for i in ax.lines]
+ assert color == expected_color
+ assert style == expected_style
+
  def test_bar_colors(self):
  default_colors = _unpack_cycler(plt.rcParams)