Revert "Revert "MAINT: Remove Long and WidePanel (pandas-dev#15748)" (pandas-dev#15802)" [skip ci]

This reverts commit 22f9d0d.

Author: gfyoung

asv_bench/benchmarks/pandas_vb_common.py

@@ -2,10 +2,7 @@
 from importlib import import_module
 
 import numpy as np
-try:
-    from pandas import Panel
-except ImportError:
-    from pandas import WidePanel as Panel  # noqa
+from pandas import Panel
 
 # Compatibility import for lib
 for imp in ['pandas._libs.lib', 'pandas.lib']:

doc/source/whatsnew/v0.23.0.txt

@@ -1038,6 +1038,8 @@ Removal of prior version deprecations/changes
 - When ``.resample()`` was changed from an eager to a lazy operation, like ``.groupby()`` in v0.18.0, we put in place compatibility (with a ``FutureWarning``),
   so operations would continue to work. This is now fully removed, so a ``Resampler`` will no longer forward compat operations (:issue:`20554`)
 
+- The ``LongPanel`` and ``WidePanel`` classes have been removed (:issue:`10892`)
+
 .. _whatsnew_0230.performance:
 
 Performance Improvements

pandas/core/api.py

@@ -21,7 +21,7 @@
 
 from pandas.core.series import Series
 from pandas.core.frame import DataFrame
-from pandas.core.panel import Panel, WidePanel
+from pandas.core.panel import Panel
 
 # TODO: Remove import when statsmodels updates #18264
 from pandas.core.reshape.reshape import get_dummies

pandas/core/panel.py

@@ -1533,24 +1533,3 @@ def _extract_axis(self, data, axis=0, intersect=False):
 ops.add_special_arithmetic_methods(Panel)
 ops.add_flex_arithmetic_methods(Panel)
 Panel._add_numeric_operations()
-
-
-# legacy
-class WidePanel(Panel):
-
-    def __init__(self, *args, **kwargs):
-        # deprecation, #10892
-        warnings.warn("WidePanel is deprecated. Please use Panel",
-                      FutureWarning, stacklevel=2)
-
-        super(WidePanel, self).__init__(*args, **kwargs)
-
-
-class LongPanel(DataFrame):
-
-    def __init__(self, *args, **kwargs):
-        # deprecation, #10892
-        warnings.warn("LongPanel is deprecated. Please use DataFrame",
-                      FutureWarning, stacklevel=2)
-
-        super(LongPanel, self).__init__(*args, **kwargs)

pandas/tests/api/test_api.py

@@ -50,7 +50,7 @@ class TestPDApi(Base):
                'TimedeltaIndex', 'Timestamp', 'Interval', 'IntervalIndex']
 
     # these are already deprecated; awaiting removal
-    deprecated_classes = ['WidePanel', 'TimeGrouper', 'Expr', 'Term']
+    deprecated_classes = ['TimeGrouper', 'Expr', 'Term']
 
     # these should be deprecated in the future
     deprecated_classes_in_future = ['Panel']

pandas/tests/io/test_pytables.py

@@ -3006,9 +3006,6 @@ def _check(left, right):
             wp = tm.makePanel()
             self._check_roundtrip(wp.to_frame(), _check)
 
-    def test_longpanel(self):
-        pass
-
     def test_overwrite_node(self):
 
         with ensure_clean_store(self.path) as store:

pandas/tests/test_panel.py

@@ -183,10 +183,6 @@ def wrapper(x):
 
 class SafeForSparse(object):
 
-    @classmethod
-    def assert_panel_equal(cls, x, y):
-        assert_panel_equal(x, y)
-
     def test_get_axis(self):
         assert (self.panel._get_axis(0) is self.panel.items)
         assert (self.panel._get_axis(1) is self.panel.major_axis)
@@ -477,8 +473,6 @@ def test_delitem_and_pop(self):
 
     def test_setitem(self):
         with catch_warnings(record=True):
-
-            # LongPanel with one item
             lp = self.panel.filter(['ItemA', 'ItemB']).to_frame()
             with pytest.raises(ValueError):
                 self.panel['ItemE'] = lp
@@ -905,10 +899,6 @@ def test_set_value(self):
 class TestPanel(PanelTests, CheckIndexing, SafeForLongAndSparse,
                 SafeForSparse):
 
-    @classmethod
-    def assert_panel_equal(cls, x, y):
-        assert_panel_equal(x, y)
-
     def setup_method(self, method):
         self.panel = make_test_panel()
         self.panel.major_axis.name = None
@@ -2154,8 +2144,8 @@ def test_multiindex_get(self):
             assert (f1.items == [1, 2]).all()
             assert (f2.items == [1, 2]).all()
 
-            ind = MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)],
-                                         names=['first', 'second'])
+            MultiIndex.from_tuples([('a', 1), ('a', 2), ('b', 1)],
+                                   names=['first', 'second'])
 
     def test_multiindex_blocks(self):
         with catch_warnings(record=True):
@@ -2462,9 +2452,9 @@ def test_sort_values(self):
         pytest.raises(NotImplementedError, self.panel.sort_values, 'ItemA')
 
 
-class TestLongPanel(object):
+class TestPanelFrame(object):
     """
-    LongPanel no longer exists, but...
+    Check that conversions to and from Panel to DataFrame work.
     """
 
     def setup_method(self, method):