DEPR: remove v018 resample compatibilitiy

closes #20554

Author: jreback

doc/source/whatsnew/v0.23.0.txt

@@ -555,7 +555,6 @@ Convert to an xarray DataArray
    p.to_xarray()
 
 
-
 .. _whatsnew_0230.api_breaking.core_common:
 
 pandas.core.common removals
@@ -923,7 +922,8 @@ Removal of prior version deprecations/changes
 - The ``infer_dst`` keyword in :meth:`Series.tz_localize`, :meth:`DatetimeIndex.tz_localize`
   and :class:`DatetimeIndex` have been removed. ``infer_dst=True`` is equivalent to
   ``ambiguous='infer'``, and ``infer_dst=False`` to ``ambiguous='raise'`` (:issue:`7963`).
-
+- 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`)
 
 .. _whatsnew_0230.performance:
 

pandas/core/resample.py

@@ -62,20 +62,6 @@ class Resampler(_GroupBy):
     _attributes = ['freq', 'axis', 'closed', 'label', 'convention',
                    'loffset', 'base', 'kind']
 
-    # API compat of allowed attributes
-    _deprecated_valids = _attributes + ['__doc__', '_cache', '_attributes',
-                                        'binner', 'grouper', 'groupby',
-                                        'sort', 'kind', 'squeeze', 'keys',
-                                        'group_keys', 'as_index', 'exclusions',
-                                        '_groupby']
-
-    # don't raise deprecation warning on attributes starting with these
-    # patterns - prevents warnings caused by IPython introspection
-    _deprecated_valid_patterns = ['_ipython', '_repr']
-
-    # API compat of disallowed attributes
-    _deprecated_invalids = ['iloc', 'loc', 'ix', 'iat', 'at']
-
     def __init__(self, obj, groupby=None, axis=0, kind=None, **kwargs):
         self.groupby = groupby
         self.keys = None
@@ -100,6 +86,16 @@ def __unicode__(self):
         return "{klass} [{attrs}]".format(klass=self.__class__.__name__,
                                           attrs=', '.join(attrs))
 
+    def __getattr__(self, attr):
+        if attr in self._internal_names_set:
+            return object.__getattribute__(self, attr)
+        if attr in self._attributes:
+            return getattr(self.groupby, attr)
+        if attr in self.obj:
+            return self[attr]
+
+        return object.__getattribute__(self, attr)
+
     @property
     def obj(self):
         return self.groupby.obj
@@ -124,100 +120,6 @@ def _from_selection(self):
                 (self.groupby.key is not None or
                  self.groupby.level is not None))
 
-    def _deprecated(self, op):
-        warnings.warn(("\n.resample() is now a deferred operation\n"
-                       "You called {op}(...) on this deferred object "
-                       "which materialized it into a {klass}\nby implicitly "
-                       "taking the mean.  Use .resample(...).mean() "
-                       "instead").format(op=op, klass=self._typ),
-                      FutureWarning, stacklevel=3)
-        return self.mean()
-
-    def _make_deprecated_binop(op):
-        # op is a string
-
-        def _evaluate_numeric_binop(self, other):
-            result = self._deprecated(op)
-            return getattr(result, op)(other)
-        return _evaluate_numeric_binop
-
-    def _make_deprecated_unary(op, name):
-        # op is a callable
-
-        def _evaluate_numeric_unary(self):
-            result = self._deprecated(name)
-            return op(result)
-        return _evaluate_numeric_unary
-
-    def __array__(self):
-        return self._deprecated('__array__').__array__()
-
-    __gt__ = _make_deprecated_binop('__gt__')
-    __ge__ = _make_deprecated_binop('__ge__')
-    __lt__ = _make_deprecated_binop('__lt__')
-    __le__ = _make_deprecated_binop('__le__')
-    __eq__ = _make_deprecated_binop('__eq__')
-    __ne__ = _make_deprecated_binop('__ne__')
-
-    __add__ = __radd__ = _make_deprecated_binop('__add__')
-    __sub__ = __rsub__ = _make_deprecated_binop('__sub__')
-    __mul__ = __rmul__ = _make_deprecated_binop('__mul__')
-    __floordiv__ = __rfloordiv__ = _make_deprecated_binop('__floordiv__')
-    __truediv__ = __rtruediv__ = _make_deprecated_binop('__truediv__')
-    if not compat.PY3:
-        __div__ = __rdiv__ = _make_deprecated_binop('__div__')
-    __neg__ = _make_deprecated_unary(lambda x: -x, '__neg__')
-    __pos__ = _make_deprecated_unary(lambda x: x, '__pos__')
-    __abs__ = _make_deprecated_unary(lambda x: np.abs(x), '__abs__')
-    __inv__ = _make_deprecated_unary(lambda x: -x, '__inv__')
-
-    def __getattr__(self, attr):
-        if attr in self._internal_names_set:
-            return object.__getattribute__(self, attr)
-        if attr in self._attributes:
-            return getattr(self.groupby, attr)
-        if attr in self.obj:
-            return self[attr]
-
-        if attr in self._deprecated_invalids:
-            raise ValueError(".resample() is now a deferred operation\n"
-                             "\tuse .resample(...).mean() instead of "
-                             ".resample(...)")
-
-        matches_pattern = any(attr.startswith(x) for x
-                              in self._deprecated_valid_patterns)
-        if not matches_pattern and attr not in self._deprecated_valids:
-            # avoid the warning, if it's just going to be an exception
-            # anyway.
-            if not hasattr(self.obj, attr):
-                raise AttributeError("'{}' has no attribute '{}'".format(
-                    type(self.obj).__name__, attr
-                ))
-            self = self._deprecated(attr)
-
-        return object.__getattribute__(self, attr)
-
-    def __setattr__(self, attr, value):
-        if attr not in self._deprecated_valids:
-            raise ValueError("cannot set values on {0}".format(
-                self.__class__.__name__))
-        object.__setattr__(self, attr, value)
-
-    def __getitem__(self, key):
-        try:
-            return super(Resampler, self).__getitem__(key)
-        except (KeyError, AbstractMethodError):
-
-            # compat for deprecated
-            if isinstance(self.obj, ABCSeries):
-                return self._deprecated('__getitem__')[key]
-
-            raise
-
-    def __setitem__(self, attr, value):
-        raise ValueError("cannot set items on {0}".format(
-            self.__class__.__name__))
-
     def _convert_obj(self, obj):
         """
         provide any conversions for the object in order to correctly handle
@@ -282,11 +184,6 @@ def _assure_grouper(self):
     def pipe(self, func, *args, **kwargs):
         return super(Resampler, self).pipe(func, *args, **kwargs)
 
-    def plot(self, *args, **kwargs):
-        # for compat with prior versions, we want to
-        # have the warnings shown here and just have this work
-        return self._deprecated('plot').plot(*args, **kwargs)
-
     _agg_doc = dedent("""
 
     Examples
@@ -853,8 +750,6 @@ def size(self):
         return result
 
 
-Resampler._deprecated_valids += dir(Resampler)
-
 
 # downsample methods
 for method in ['sum', 'prod']:

pandas/tests/test_resample.py

@@ -84,122 +84,6 @@ def test_api(self):
         assert isinstance(result, DataFrame)
         assert len(result) == 217
 
-    def test_api_changes_v018(self):
-
-        # change from .resample(....., how=...)
-        # to .resample(......).how()
-
-        r = self.series.resample('H')
-        assert isinstance(r, DatetimeIndexResampler)
-
-        for how in ['sum', 'mean', 'prod', 'min', 'max', 'var', 'std']:
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                result = self.series.resample('H', how=how)
-                expected = getattr(self.series.resample('H'), how)()
-                tm.assert_series_equal(result, expected)
-
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = self.series.resample('H', how='ohlc')
-            expected = self.series.resample('H').ohlc()
-            tm.assert_frame_equal(result, expected)
-
-        # compat for pandas-like methods
-        for how in ['sort_values', 'isna']:
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                getattr(r, how)()
-
-        # invalids as these can be setting operations
-        r = self.series.resample('H')
-        pytest.raises(ValueError, lambda: r.iloc[0])
-        pytest.raises(ValueError, lambda: r.iat[0])
-        pytest.raises(ValueError, lambda: r.loc[0])
-        pytest.raises(ValueError, lambda: r.loc[
-            Timestamp('2013-01-01 00:00:00', offset='H')])
-        pytest.raises(ValueError, lambda: r.at[
-            Timestamp('2013-01-01 00:00:00', offset='H')])
-
-        def f():
-            r[0] = 5
-
-        pytest.raises(ValueError, f)
-
-        # str/repr
-        r = self.series.resample('H')
-        with tm.assert_produces_warning(None):
-            str(r)
-        with tm.assert_produces_warning(None):
-            repr(r)
-
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            tm.assert_numpy_array_equal(np.array(r), np.array(r.mean()))
-
-        # masquerade as Series/DataFrame as needed for API compat
-        assert isinstance(self.series.resample('H'), ABCSeries)
-        assert not isinstance(self.frame.resample('H'), ABCSeries)
-        assert not isinstance(self.series.resample('H'), ABCDataFrame)
-        assert isinstance(self.frame.resample('H'), ABCDataFrame)
-
-        # bin numeric ops
-        for op in ['__add__', '__mul__', '__truediv__', '__div__', '__sub__']:
-
-            if getattr(self.series, op, None) is None:
-                continue
-            r = self.series.resample('H')
-
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                assert isinstance(getattr(r, op)(2), Series)
-
-        # unary numeric ops
-        for op in ['__pos__', '__neg__', '__abs__', '__inv__']:
-
-            if getattr(self.series, op, None) is None:
-                continue
-            r = self.series.resample('H')
-
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                assert isinstance(getattr(r, op)(), Series)
-
-        # comparison ops
-        for op in ['__lt__', '__le__', '__gt__', '__ge__', '__eq__', '__ne__']:
-            r = self.series.resample('H')
-
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                assert isinstance(getattr(r, op)(2), Series)
-
-        # IPython introspection shouldn't trigger warning GH 13618
-        for op in ['_repr_json', '_repr_latex',
-                   '_ipython_canary_method_should_not_exist_']:
-            r = self.series.resample('H')
-            with tm.assert_produces_warning(None):
-                getattr(r, op, None)
-
-        # getitem compat
-        df = self.series.to_frame('foo')
-
-        # same as prior versions for DataFrame
-        pytest.raises(KeyError, lambda: df.resample('H')[0])
-
-        # compat for Series
-        # but we cannot be sure that we need a warning here
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = self.series.resample('H')[0]
-            expected = self.series.resample('H').mean()[0]
-            assert result == expected
-
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = self.series.resample('H')['2005-01-09 23:00:00']
-            expected = self.series.resample('H').mean()['2005-01-09 23:00:00']
-            assert result == expected
-
     def test_groupby_resample_api(self):
 
         # GH 12448
@@ -251,23 +135,6 @@ def test_pipe(self):
         result = r.pipe(lambda x: x.max() - x.mean())
         tm.assert_frame_equal(result, expected)
 
-    @td.skip_if_no_mpl
-    def test_plot_api(self):
-        # .resample(....).plot(...)
-        # hitting warnings
-        # GH 12448
-        s = Series(np.random.randn(60),
-                   index=date_range('2016-01-01', periods=60, freq='1min'))
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = s.resample('15min').plot()
-            tm.assert_is_valid_plot_return_object(result)
-
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = s.resample('15min', how='sum').plot()
-            tm.assert_is_valid_plot_return_object(result)
-
     def test_getitem(self):
 
         r = self.frame.resample('H')
@@ -301,15 +168,6 @@ def test_attribute_access(self):
         r = self.frame.resample('H')
         tm.assert_series_equal(r.A.sum(), r['A'].sum())
 
-        # getting
-        pytest.raises(AttributeError, lambda: r.F)
-
-        # setting
-        def f():
-            r.F = 'bah'
-
-        pytest.raises(ValueError, f)
-
     def test_api_compat_before_use(self):
 
         # make sure that we are setting the binner
@@ -3012,23 +2870,6 @@ def setup_method(self, method):
                                                 freq='s',
                                                 periods=40))
 
-    def test_back_compat_v180(self):
-
-        df = self.frame
-        for how in ['sum', 'mean', 'prod', 'min', 'max', 'var', 'std']:
-            with tm.assert_produces_warning(FutureWarning,
-                                            check_stacklevel=False):
-                result = df.groupby('A').resample('4s', how=how)
-                expected = getattr(df.groupby('A').resample('4s'), how)()
-                assert_frame_equal(result, expected)
-
-        with tm.assert_produces_warning(FutureWarning,
-                                        check_stacklevel=False):
-            result = df.groupby('A').resample('4s', how='mean',
-                                              fill_method='ffill')
-            expected = df.groupby('A').resample('4s').mean().ffill()
-            assert_frame_equal(result, expected)
-
     def test_tab_complete_ipython6_warning(self, ip):
         from IPython.core.completer import provisionalcompleter
         code = dedent("""\