CLN: Move _constructor checks to PandasObject base

Author: jtratner

pandas/core/base.py

@@ -42,6 +42,11 @@ def __repr__(self):
 class PandasObject(StringMixin):
     """baseclass for various pandas objects"""
 
+    @property
+    def _constructor(self):
+        """class constructor (for this class it's just `__class__`"""
+        return self.__class__
+
     def __unicode__(self):
         """
         Return a string representation for a particular object.

pandas/core/frame.py

@@ -584,10 +584,6 @@ def _verbose_info(self, value):
     def axes(self):
         return [self.index, self.columns]
 
-    @property
-    def _constructor(self):
-        return self.__class__
-
     @property
     def shape(self):
         return (len(self.index), len(self.columns))

pandas/core/generic.py

@@ -633,10 +633,6 @@ def astype(self, dtype, copy = True, raise_on_error = True):
         mgr = self._data.astype(dtype, copy = copy, raise_on_error = raise_on_error)
         return self._constructor(mgr)
 
-    @property
-    def _constructor(self):
-        return NDFrame
-
     @property
     def axes(self):
         return self._data.axes

pandas/core/index.py

@@ -208,10 +208,6 @@ def _set_names(self, values):
 
     names = property(fset=_set_names, fget=_get_names)
 
-    @property
-    def _constructor(self):
-        return Index
-
     @property
     def _has_complex_internals(self):
         # to disable groupby tricks in MultiIndex
@@ -1379,10 +1375,6 @@ def __new__(cls, data, dtype=None, copy=False, name=None):
     def inferred_type(self):
         return 'integer'
 
-    @property
-    def _constructor(self):
-        return Int64Index
-
     @property
     def asi8(self):
         # do not cache or you'll create a memory leak

pandas/core/panel.py

@@ -186,10 +186,6 @@ class Panel(NDFrame):
     major_axis = lib.AxisProperty(1)
     minor_axis = lib.AxisProperty(2)
 
-    @property
-    def _constructor(self):
-        return type(self)
-
     # return the type of the slice constructor
     _constructor_sliced = DataFrame
 

pandas/core/series.py

@@ -519,10 +519,6 @@ def __init__(self, data=None, index=None, dtype=None, name=None,
                  copy=False):
         pass
 
-    @property
-    def _constructor(self):
-        return Series
-
     @property
     def _can_hold_na(self):
         return not is_integer_dtype(self.dtype)