BUG: error in Float64Index with contains and non-float (GH7025)

doc/source/release.rst

@@ -456,6 +456,7 @@ Bug Fixes
 - Bug in ``iloc`` when setting / aligning (:issue:`6766`)
 - Bug causing UnicodeEncodeError when get_dummies called with unicode values and a prefix (:issue:`6885`)
 - Bug in timeseries-with-frequency plot cursor display (:issue:`5453`)
+- Bug surfaced in groupby.plot when using a ``Float64Index`` (:issue:`7025`)
 
 pandas 0.13.1
 -------------

pandas/core/index.py

@@ -2047,6 +2047,8 @@ def __contains__(self, other):
                 return len(other) <= 1 and _try_get_item(other) in self
             except TypeError:
                 return False
+        except:
+            return False
 
     def get_loc(self, key):
         if np.isnan(key):

pandas/tests/test_groupby.py

@@ -33,6 +33,11 @@
 import pandas as pd
 from numpy.testing import assert_equal
 
+def _skip_if_mpl_not_installed():
+    try:
+        import matplotlib.pyplot as plt
+    except ImportError:
+        raise nose.SkipTest("matplotlib not installed")
 
 def commonSetUp(self):
     self.dateRange = bdate_range('1/1/2005', periods=250)
@@ -3976,11 +3981,8 @@ def test_groupby_blacklist(self):
                     getattr(gb, bl)
 
     def test_series_groupby_plotting_nominally_works(self):
-        try:
-            import matplotlib as mpl
-            mpl.use('Agg')
-        except ImportError:
-            raise nose.SkipTest("matplotlib not installed")
+        _skip_if_mpl_not_installed()
+
         n = 10
         weight = Series(np.random.normal(166, 20, size=n))
         height = Series(np.random.normal(60, 10, size=n))
@@ -3991,14 +3993,26 @@ def test_series_groupby_plotting_nominally_works(self):
         height.groupby(gender).hist()
         tm.close()
 
+    def test_plotting_with_float_index_works(self):
+        _skip_if_mpl_not_installed()
+
+        # GH 7025
+        df = DataFrame({'def': [1,1,1,2,2,2,3,3,3],
+                        'val': np.random.randn(9)},
+                       index=[1.0,2.0,3.0,1.0,2.0,3.0,1.0,2.0,3.0])
+
+        df.groupby('def')['val'].plot()
+        tm.close()
+        df.groupby('def')['val'].apply(lambda x: x.plot())
+        tm.close()
+
     @slow
     def test_frame_groupby_plot_boxplot(self):
-        try:
-            import matplotlib.pyplot as plt
-            import matplotlib as mpl
-            mpl.use('Agg')
-        except ImportError:
-            raise nose.SkipTest("matplotlib not installed")
+        _skip_if_mpl_not_installed()
+
+        import matplotlib.pyplot as plt
+        import matplotlib as mpl
+        mpl.use('Agg')
         tm.close()
 
         n = 10
@@ -4029,12 +4043,10 @@ def test_frame_groupby_plot_boxplot(self):
 
     @slow
     def test_frame_groupby_hist(self):
-        try:
-            import matplotlib.pyplot as plt
-            import matplotlib as mpl
-            mpl.use('Agg')
-        except ImportError:
-            raise nose.SkipTest("matplotlib not installed")
+        _skip_if_mpl_not_installed()
+        import matplotlib.pyplot as plt
+        import matplotlib as mpl
+        mpl.use('Agg')
         tm.close()
 
         n = 10