TST: add tests for deprecation warnings from plotting functions

parallel_coordinates/andrews_curves
- added deprecate_kwarg decorator for using frame argument instead of data
- added tests to check that FutureWarning is raised properly

Author: AnomRake

doc/source/release.rst

@@ -233,6 +233,10 @@ Deprecations
   instead of ``colors``. A ``FutureWarning`` is raised  to alert that
   the old ``colors`` argument will not be supported in a future release
 
+- The :func:`parallel_coordinates` and :func:`andrews_curves` functions now take 
+  positional argument ``frame`` instead of ``data``. A ``FutureWarning`` is 
+  raised  if the old ``data`` argument is used by name.
+
 Prior Version Deprecations/Changes
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
@@ -464,6 +468,10 @@ Bug Fixes
 - Bug in timeseries-with-frequency plot cursor display (:issue:`5453`)
 - Bug surfaced in groupby.plot when using a ``Float64Index`` (:issue:`7025`)
 - Stopped tests from failing if options data isn't able to be downloaded from Yahoo (:issue:`7034`)
+- Bug in ``parallel_coordinates`` and ``radviz`` where reordering of class column 
+  caused possible color/class mismatch
+- Bug in ``radviz`` and ``andrews_curves`` where multiple values of 'color'
+  were being passed to plotting method
 
 pandas 0.13.1
 -------------

doc/source/v0.14.0.txt

@@ -382,6 +382,14 @@ Plotting
 
   Because of the default `align` value changes, coordinates of bar plots are now located on integer values (0.0, 1.0, 2.0 ...). This is intended to make bar plot be located on the same coodinates as line plot. However, bar plot may differs unexpectedly when you manually adjust the bar location or drawing area, such as using `set_xlim`, `set_ylim`, etc. In this cases, please modify your script to meet with new coordinates.
 
+- The :func:`parallel_coordinates` function now takes argument ``color``
+  instead of ``colors``. A ``FutureWarning`` is raised  to alert that
+  the old ``colors`` argument will not be supported in a future release
+
+- The :func:`parallel_coordinates` and :func:`andrews_curves` functions now take 
+  positional argument ``frame`` instead of ``data``. A ``FutureWarning`` is 
+  raised  if the old ``data`` argument is used by name.
+  
 .. _whatsnew_0140.prior_deprecations:
 
 Prior Version Deprecations/Changes

pandas/tests/test_graphics.py

@@ -1240,6 +1240,9 @@ def test_andrews_curves(self):
         ax = andrews_curves(df, 'Name', color=colors)
         legend_colors = [l.get_color() for l in ax.legend().get_lines()]
         self.assertEqual(colors, legend_colors)
+        
+        with tm.assert_produces_warning(FutureWarning):
+            andrews_curves(data=df, class_column='Name')
 
     @slow
     def test_parallel_coordinates(self):
@@ -1269,6 +1272,12 @@ def test_parallel_coordinates(self):
         ax = parallel_coordinates(df, 'Name', color=colors)
         legend_colors = [l.get_color() for l in ax.legend().get_lines()]
         self.assertEqual(colors, legend_colors)
+        
+        with tm.assert_produces_warning(FutureWarning):
+            parallel_coordinates(df, 'Name', colors=colors)
+        
+        with tm.assert_produces_warning(FutureWarning):
+            parallel_coordinates(data=df, class_column='Name')
 
     @slow
     def test_radviz(self):

pandas/tools/plotting.py

@@ -354,7 +354,6 @@ def _get_marker_compat(marker):
         return 'o'
     return marker
 
-
 def radviz(frame, class_column, ax=None, color=None, colormap=None, **kwds):
     """RadViz - a multivariate data visualization algorithm
 
@@ -439,7 +438,7 @@ def normalize(series):
     ax.axis('equal')
     return ax
 
-
+@deprecate_kwarg(old_arg_name='data', new_arg_name='frame')
 def andrews_curves(frame, class_column, ax=None, samples=200, color=None,
                    colormap=None, **kwds):
     """
@@ -571,6 +570,7 @@ def bootstrap_plot(series, fig=None, size=50, samples=500, **kwds):
     return fig
 
 @deprecate_kwarg(old_arg_name='colors', new_arg_name='color')
+@deprecate_kwarg(old_arg_name='data', new_arg_name='frame')
 def parallel_coordinates(frame, class_column, cols=None, ax=None, color=None,
                          use_columns=False, xticks=None, colormap=None,
                          **kwds):