Add 'color' and 'size' to arguments

pandas/plotting/_core.py

@@ -1615,6 +1615,11 @@ def scatter(self, x, y, s=None, c=None, **kwargs):
 
               .. versionchanged:: 1.1.0
 
+        size : str, int or array-like, optional
+                The color of each point. Alias for `s`.
+                `s` and `size` aren't allowed at the same time.
+                .. versionadded:: 1.4.1
+
         c : str, int or array-like, optional
             The color of each point. Possible values are:
 
@@ -1629,6 +1634,11 @@ def scatter(self, x, y, s=None, c=None, **kwargs):
             - A column name or position whose values will be used to color the
               marker points according to a colormap.
 
+        color : str, int or array-like, optional
+                The color of each point. Alias for `c`.
+                `c` and `color` aren't allowed at the same time.
+                .. versionadded:: 1.4.1
+
         **kwargs
             Keyword arguments to pass on to :meth:`DataFrame.plot`.
 
@@ -1666,7 +1676,19 @@ def scatter(self, x, y, s=None, c=None, **kwargs):
             ...                       c='species',
             ...                       colormap='viridis')
         """
-        return self(kind="scatter", x=x, y=y, s=s, c=c, **kwargs)
+        size = kwargs.pop("size", None)
+        if s is not None and size is not None:
+            raise TypeError("Specify exactly one of `s` and `size`")
+        elif s is not None or size is not None:
+            kwargs["s"] = s if s is not None else size
+
+        color = kwargs.pop("color", None)
+        if c is not None and color is not None:
+            raise TypeError("Specify exactly one of `c` and `color`")
+        elif c is not None or color is not None:
+            kwargs["c"] = c if c is not None else color
+
+        return self(kind="scatter", x=x, y=y, **kwargs)
 
     def hexbin(self, x, y, C=None, reduce_C_function=None, gridsize=None, **kwargs):
         """

pandas/tests/plotting/frame/test_frame.py

@@ -1,4 +1,3 @@
-""" Test cases for DataFrame.plot """
 from datetime import (
     date,
     datetime,
@@ -654,6 +653,11 @@ def test_plot_scatter(self):
         with pytest.raises(TypeError, match=msg):
             df.plot.scatter(y="y")
 
+        with pytest.raises(TypeError, match="Specify exactly one of `s` and `size`"):
+            df.plot.scatter(x="x", y="y", s=2, size=2)
+        with pytest.raises(TypeError, match="Specify exactly one of `c` and `color`"):
+            df.plot.scatter(x="a", y="b", c="red", color="green")
+
         # GH 6951
         axes = df.plot(x="x", y="y", kind="scatter", subplots=True)
         self._check_axes_shape(axes, axes_num=1, layout=(1, 1))

pandas/tests/plotting/frame/test_frame_color.py

@@ -196,14 +196,15 @@ def test_if_scatterplot_colorbars_are_next_to_parent_axes(self):
         assert np.isclose(parent_distance, colorbar_distance, atol=1e-7).all()
 
     @pytest.mark.parametrize("cmap", [None, "Greys"])
-    def test_scatter_with_c_column_name_with_colors(self, cmap):
+    @pytest.mark.parametrize("kw", ["c", "color"])
+    def test_scatter_with_c_column_name_with_colors(self, cmap, kw):
         # https://github.com/pandas-dev/pandas/issues/34316
         df = DataFrame(
             [[5.1, 3.5], [4.9, 3.0], [7.0, 3.2], [6.4, 3.2], [5.9, 3.0]],
             columns=["length", "width"],
         )
         df["species"] = ["r", "r", "g", "g", "b"]
-        ax = df.plot.scatter(x=0, y=1, c="species", cmap=cmap)
+        ax = df.plot.scatter(x=0, y=1, cmap=cmap, **{kw: "species"})
         assert ax.collections[0].colorbar is None
 
     def test_scatter_colors(self):