CLN: remove Panel from concat error message (pandas-dev#25676)

pandas/core/reshape/concat.py

@@ -282,10 +282,10 @@ def __init__(self, objs, axis=0, join='outer', join_axes=None,
         # consolidate data & figure out what our result ndim is going to be
         ndims = set()
         for obj in objs:
-            if not isinstance(obj, NDFrame):
-                msg = ('cannot concatenate object of type "{0}";'
-                       ' only pd.Series, pd.DataFrame, and pd.Panel'
-                       ' (deprecated) objs are valid'.format(type(obj)))
+            if not isinstance(obj, (Series, DataFrame)):
+                msg = ("cannot concatenate object of type '{}';"
+                       ' only Series and DataFrame objs are valid'
+                       .format(type(obj)))
                 raise TypeError(msg)
 
             # consolidate

pandas/tests/reshape/test_concat.py

@@ -16,7 +16,7 @@
 
 import pandas as pd
 from pandas import (
-    Categorical, DataFrame, DatetimeIndex, Index, MultiIndex, Panel, Series,
+    Categorical, DataFrame, DatetimeIndex, Index, MultiIndex, Series,
     Timestamp, concat, date_range, isna, read_csv)
 from pandas.tests.extension.decimal import to_decimal
 from pandas.util import testing as tm
@@ -196,9 +196,8 @@ def test_concatlike_same_dtypes(self):
             tm.assert_series_equal(res, exp, check_index_type=True)
 
             # cannot append non-index
-            msg = (r'cannot concatenate object of type \"(.+?)\";'
-                   ' only pd.Series, pd.DataFrame, and pd.Panel'
-                   r' \(deprecated\) objs are valid')
+            msg = (r"cannot concatenate object of type '.+';"
+                   " only Series and DataFrame objs are valid")
             with pytest.raises(TypeError, match=msg):
                 pd.Series(vals1).append(vals2)
 
@@ -1534,33 +1533,6 @@ def test_dtype_coerceion(self):
         result = concat([df.iloc[[0]], df.iloc[[1]]])
         tm.assert_series_equal(result.dtypes, df.dtypes)
 
-    @pytest.mark.filterwarnings("ignore:\\nPanel:FutureWarning")
-    # Panel.rename warning we don't care about
-    @pytest.mark.filterwarnings("ignore:Using:FutureWarning")
-    def test_panel_concat_buglet(self, sort):
-        # #2257
-        def make_panel():
-            index = 5
-            cols = 3
-
-            def df():
-                return DataFrame(np.random.randn(index, cols),
-                                 index=["I%s" % i for i in range(index)],
-                                 columns=["C%s" % i for i in range(cols)])
-            return Panel({"Item%s" % x: df() for x in ['A', 'B', 'C']})
-
-        panel1 = make_panel()
-        panel2 = make_panel()
-
-        panel2 = panel2.rename(major_axis={x: "%s_1" % x
-                                           for x in panel2.major_axis})
-
-        panel3 = panel2.rename(major_axis=lambda x: '%s_1' % x)
-        panel3 = panel3.rename(minor_axis=lambda x: '%s_1' % x)
-
-        # it works!
-        concat([panel1, panel3], axis=1, verify_integrity=True, sort=sort)
-
     def test_concat_series(self):
 
         ts = tm.makeTimeSeries()
@@ -1781,9 +1753,8 @@ def test_concat_invalid(self):
 
         # trying to concat a ndframe with a non-ndframe
         df1 = mkdf(10, 2)
-        msg = ('cannot concatenate object of type "{}";'
-               ' only pd.Series, pd.DataFrame, and pd.Panel'
-               r' \(deprecated\) objs are valid')
+        msg = ("cannot concatenate object of type '{}';"
+               " only Series and DataFrame objs are valid")
         for obj in [1, dict(), [1, 2], (1, 2)]:
             with pytest.raises(TypeError, match=msg.format(type(obj))):
                 concat([df1, obj])
@@ -2400,9 +2371,8 @@ def test_concat_different_extension_dtypes_upcasts(self):
         tm.assert_series_equal(result, expected)
 
 
-@pytest.mark.parametrize('pdt', [pd.Series, pd.DataFrame, pd.Panel])
+@pytest.mark.parametrize('pdt', [pd.Series, pd.DataFrame])
 @pytest.mark.parametrize('dt', np.sctypes['float'])
-@pytest.mark.filterwarnings("ignore:\\nPanel:FutureWarning")
 def test_concat_no_unnecessary_upcast(dt, pdt):
     # GH 13247
     dims = pdt().ndim
@@ -2413,9 +2383,8 @@ def test_concat_no_unnecessary_upcast(dt, pdt):
     assert x.values.dtype == dt
 
 
-@pytest.mark.parametrize('pdt', [pd.Series, pd.DataFrame, pd.Panel])
+@pytest.mark.parametrize('pdt', [pd.Series, pd.DataFrame])
 @pytest.mark.parametrize('dt', np.sctypes['int'])
-@pytest.mark.filterwarnings("ignore:\\nPanel:FutureWarning")
 def test_concat_will_upcast(dt, pdt):
     with catch_warnings(record=True):
         dims = pdt().ndim