CLN: Remove pandas.util | tools/hashing.py (#19181)

Deprecated in v0.20.0

xref gh-16223

Author: gfyoung

doc/source/whatsnew/v0.23.0.txt

@@ -317,6 +317,7 @@ Removal of prior version deprecations/changes
 - The options ``display.line_with`` and ``display.height`` are removed in favor of ``display.width`` and ``display.max_rows`` respectively (:issue:`4391`, :issue:`19107`)
 - The ``labels`` attribute of the ``Categorical`` class has been removed in favor of :attribute:`Categorical.codes` (:issue:`7768`)
 - The ``flavor`` parameter have been removed from func:`to_sql` method (:issue:`13611`)
+- The modules `pandas.tools.hashing` and `pandas.util.hashing` have been removed (:issue:`16223`)
 
 .. _whatsnew_0230.performance:
 

pandas/tests/util/test_hashing.py

@@ -290,18 +290,3 @@ def test_hash_collisions(self):
         result = hash_array(np.asarray(L, dtype=object), 'utf8')
         tm.assert_numpy_array_equal(
             result, np.concatenate([expected1, expected2], axis=0))
-
-
-def test_deprecation():
-
-    with tm.assert_produces_warning(DeprecationWarning,
-                                    check_stacklevel=False):
-        from pandas.tools.hashing import hash_pandas_object
-        obj = Series(list('abc'))
-        hash_pandas_object(obj, hash_key='9876543210123456')
-
-    with tm.assert_produces_warning(DeprecationWarning,
-                                    check_stacklevel=False):
-        from pandas.tools.hashing import hash_array
-        obj = np.array([1, 2, 3])
-        hash_array(obj, hash_key='9876543210123456')