Frame ops prelims - de-duplicate, remove unused kwargs (#19522)

doc/source/whatsnew/v0.23.0.txt

@@ -582,6 +582,7 @@ Numeric
 - Bug in :class:`Index` multiplication and division methods where operating with a ``Series`` would return an ``Index`` object instead of a ``Series`` object (:issue:`19042`)
 - Bug in the :class:`DataFrame` constructor in which data containing very large positive or very large negative numbers was causing ``OverflowError`` (:issue:`18584`)
 - Bug in :class:`Index` constructor with ``dtype='uint64'`` where int-like floats were not coerced to :class:`UInt64Index` (:issue:`18400`)
+- Bug in :class:`DataFrame` flex arithmetic (e.g. `df.add(other, fill_value=foo)`) with a `fill_value` other than ``None`` failed to raise ``NotImplementedError`` in corner cases where either the frame or ``other`` has length zero (:issue:`19522`)
 
 
 Indexing

pandas/core/frame.py

@@ -3915,8 +3915,7 @@ def reorder_levels(self, order, axis=0):
     # ----------------------------------------------------------------------
     # Arithmetic / combination related
 
-    def _combine_frame(self, other, func, fill_value=None, level=None,
-                       try_cast=True):
+    def _combine_frame(self, other, func, fill_value=None, level=None):
         this, other = self.align(other, join='outer', level=level, copy=False)
         new_index, new_columns = this.index, this.columns
 
@@ -3968,52 +3967,40 @@ def f(i):
 
     def _combine_series(self, other, func, fill_value=None, axis=None,
                         level=None, try_cast=True):
+        if fill_value is not None:
+            raise NotImplementedError("fill_value {fill} not supported."
+                                      .format(fill=fill_value))
+
         if axis is not None:
             axis = self._get_axis_name(axis)
             if axis == 'index':
-                return self._combine_match_index(other, func, level=level,
-                                                 fill_value=fill_value,
-                                                 try_cast=try_cast)
+                return self._combine_match_index(other, func, level=level)
             else:
                 return self._combine_match_columns(other, func, level=level,
-                                                   fill_value=fill_value,
                                                    try_cast=try_cast)
-        return self._combine_series_infer(other, func, level=level,
-                                          fill_value=fill_value,
-                                          try_cast=try_cast)
-
-    def _combine_series_infer(self, other, func, level=None,
-                              fill_value=None, try_cast=True):
-        if len(other) == 0:
-            return self * np.nan
+        else:
+            if not len(other):
+                return self * np.nan
 
-        if len(self) == 0:
-            # Ambiguous case, use _series so works with DataFrame
-            return self._constructor(data=self._series, index=self.index,
-                                     columns=self.columns)
+            if not len(self):
+                # Ambiguous case, use _series so works with DataFrame
+                return self._constructor(data=self._series, index=self.index,
+                                         columns=self.columns)
 
-        return self._combine_match_columns(other, func, level=level,
-                                           fill_value=fill_value,
-                                           try_cast=try_cast)
+            # default axis is columns
+            return self._combine_match_columns(other, func, level=level,
+                                               try_cast=try_cast)
 
-    def _combine_match_index(self, other, func, level=None,
-                             fill_value=None, try_cast=True):
+    def _combine_match_index(self, other, func, level=None):
         left, right = self.align(other, join='outer', axis=0, level=level,
                                  copy=False)
-        if fill_value is not None:
-            raise NotImplementedError("fill_value %r not supported." %
-                                      fill_value)
         return self._constructor(func(left.values.T, right.values).T,
                                  index=left.index, columns=self.columns,
                                  copy=False)
 
-    def _combine_match_columns(self, other, func, level=None,
-                               fill_value=None, try_cast=True):
+    def _combine_match_columns(self, other, func, level=None, try_cast=True):
         left, right = self.align(other, join='outer', axis=1, level=level,
                                  copy=False)
-        if fill_value is not None:
-            raise NotImplementedError("fill_value %r not supported" %
-                                      fill_value)
 
         new_data = left._data.eval(func=func, other=right,
                                    axes=[left.columns, self.index],

pandas/core/indexes/base.py

@@ -80,6 +80,26 @@ def _try_get_item(x):
         return x
 
 
+def _make_invalid_op(name):
+    """
+    Return a binary method that always raises a TypeError.
+
+    Parameters
+    ----------
+    name : str
+
+    Returns
+    -------
+    invalid_op : function
+    """
+    def invalid_op(self, other=None):
+        raise TypeError("cannot perform {name} with this index type: "
+                        "{typ}".format(name=name, typ=type(self)))
+
+    invalid_op.__name__ = name
+    return invalid_op
+
+
 class InvalidIndexError(Exception):
     pass
 
@@ -3916,30 +3936,12 @@ def _evaluate_compare(self, other):
     @classmethod
     def _add_numeric_methods_add_sub_disabled(cls):
         """ add in the numeric add/sub methods to disable """
-
-        def _make_invalid_op(name):
-            def invalid_op(self, other=None):
-                raise TypeError("cannot perform {name} with this index type: "
-                                "{typ}".format(name=name, typ=type(self)))
-
-            invalid_op.__name__ = name
-            return invalid_op
-
         cls.__add__ = cls.__radd__ = __iadd__ = _make_invalid_op('__add__')  # noqa
         cls.__sub__ = __isub__ = _make_invalid_op('__sub__')  # noqa
 
     @classmethod
     def _add_numeric_methods_disabled(cls):
         """ add in numeric methods to disable other than add/sub """
-
-        def _make_invalid_op(name):
-            def invalid_op(self, other=None):
-                raise TypeError("cannot perform {name} with this index type: "
-                                "{typ}".format(name=name, typ=type(self)))
-
-            invalid_op.__name__ = name
-            return invalid_op
-
         cls.__pow__ = cls.__rpow__ = _make_invalid_op('__pow__')
         cls.__mul__ = cls.__rmul__ = _make_invalid_op('__mul__')
         cls.__floordiv__ = cls.__rfloordiv__ = _make_invalid_op('__floordiv__')
@@ -4147,15 +4149,6 @@ def logical_func(self, *args, **kwargs):
     @classmethod
     def _add_logical_methods_disabled(cls):
         """ add in logical methods to disable """
-
-        def _make_invalid_op(name):
-            def invalid_op(self, other=None):
-                raise TypeError("cannot perform {name} with this index type: "
-                                "{typ}".format(name=name, typ=type(self)))
-
-            invalid_op.__name__ = name
-            return invalid_op
-
         cls.all = _make_invalid_op('all')
         cls.any = _make_invalid_op('any')
 

pandas/core/ops.py

@@ -1106,12 +1106,13 @@ def f(self, other, axis=default_axis, level=None, fill_value=None):
         if isinstance(other, ABCDataFrame):  # Another DataFrame
             return self._combine_frame(other, na_op, fill_value, level)
         elif isinstance(other, ABCSeries):
-            return self._combine_series(other, na_op, fill_value, axis, level)
+            return self._combine_series(other, na_op, fill_value, axis, level,
+                                        try_cast=True)
         else:
             if fill_value is not None:
                 self = self.fillna(fill_value)
 
-            return self._combine_const(other, na_op)
+            return self._combine_const(other, na_op, try_cast=True)
 
     f.__name__ = name
 
@@ -1172,7 +1173,8 @@ def f(self, other):
         if isinstance(other, ABCDataFrame):  # Another DataFrame
             return self._compare_frame(other, func, str_rep)
         elif isinstance(other, ABCSeries):
-            return self._combine_series_infer(other, func, try_cast=False)
+            return self._combine_series(other, func,
+                                        axis=None, try_cast=False)
         else:
 
             # straight boolean comparisons we want to allow all columns

pandas/core/sparse/frame.py

@@ -540,8 +540,7 @@ def xs(self, key, axis=0, copy=False):
     # ----------------------------------------------------------------------
     # Arithmetic-related methods
 
-    def _combine_frame(self, other, func, fill_value=None, level=None,
-                       try_cast=True):
+    def _combine_frame(self, other, func, fill_value=None, level=None):
         this, other = self.align(other, join='outer', level=level, copy=False)
         new_index, new_columns = this.index, this.columns
 
@@ -584,12 +583,9 @@ def _combine_frame(self, other, func, fill_value=None, level=None,
                                  default_fill_value=new_fill_value
                                  ).__finalize__(self)
 
-    def _combine_match_index(self, other, func, level=None, fill_value=None,
-                             try_cast=True):
+    def _combine_match_index(self, other, func, level=None):
         new_data = {}
 
-        if fill_value is not None:
-            raise NotImplementedError("'fill_value' argument is not supported")
         if level is not None:
             raise NotImplementedError("'level' argument is not supported")
 
@@ -605,6 +601,7 @@ def _combine_match_index(self, other, func, level=None, fill_value=None,
             new_data[col] = func(series.values, other.values)
 
         # fill_value is a function of our operator
+        fill_value = None
         if isna(other.fill_value) or isna(self.default_fill_value):
             fill_value = np.nan
         else:
@@ -615,15 +612,12 @@ def _combine_match_index(self, other, func, level=None, fill_value=None,
             new_data, index=new_index, columns=self.columns,
             default_fill_value=fill_value).__finalize__(self)
 
-    def _combine_match_columns(self, other, func, level=None, fill_value=None,
-                               try_cast=True):
+    def _combine_match_columns(self, other, func, level=None, try_cast=True):
         # patched version of DataFrame._combine_match_columns to account for
         # NumPy circumventing __rsub__ with float64 types, e.g.: 3.0 - series,
         # where 3.0 is numpy.float64 and series is a SparseSeries. Still
         # possible for this to happen, which is bothersome
 
-        if fill_value is not None:
-            raise NotImplementedError("'fill_value' argument is not supported")
         if level is not None:
             raise NotImplementedError("'level' argument is not supported")
 

pandas/tests/frame/test_operators.py

@@ -381,6 +381,19 @@ def test_arith_flex_frame(self):
         with tm.assert_raises_regex(NotImplementedError, 'fill_value'):
             self.frame.add(self.frame.iloc[0], axis='index', fill_value=3)
 
+    def test_arith_flex_zero_len_raises(self):
+        # GH#19522 passing fill_value to frame flex arith methods should
+        # raise even in the zero-length special cases
+        ser_len0 = pd.Series([])
+        df_len0 = pd.DataFrame([], columns=['A', 'B'])
+        df = pd.DataFrame([[1, 2], [3, 4]], columns=['A', 'B'])
+
+        with tm.assert_raises_regex(NotImplementedError, 'fill_value'):
+            df.add(ser_len0, fill_value='E')
+
+        with tm.assert_raises_regex(NotImplementedError, 'fill_value'):
+            df_len0.sub(df['A'], axis=None, fill_value=3)
+
     def test_binary_ops_align(self):
 
         # test aligning binary ops