Add shim modules with deprecation warnings to ensure backward compatibility

The following shim modules are included:
  - `pandas.computation`
  - `pandas.tools.hashing`
  - `pandas.types`

Fixes pandas-dev#16138

Author: dhirschf

pandas/computation/__init__.py

@@ -0,0 +1,14 @@
+import warnings
+
+
+warnings.warn(
+    "The pandas.computation module is deprecated and will be removed in a future "
+    "version. Please import from the pandas.core.computation module instead.",
+    FutureWarning, stacklevel=2
+)
+
+
+from . import (
+    align, api, common, engines, eval,
+    expr, expressions, ops, pytables, scope
+)

pandas/computation/align.py

@@ -0,0 +1 @@
+from pandas.core.computation.align import *

pandas/computation/api.py

@@ -0,0 +1 @@
+from pandas.core.computation.api import *

pandas/computation/common.py

@@ -0,0 +1 @@
+from pandas.core.computation.common import *

pandas/computation/engines.py

@@ -0,0 +1 @@
+from pandas.core.computation.engines import *

pandas/computation/eval.py

@@ -0,0 +1 @@
+from pandas.core.computation.eval import *

pandas/computation/expr.py

@@ -0,0 +1 @@
+from pandas.core.computation.expr import *

pandas/computation/expressions.py

@@ -0,0 +1 @@
+from pandas.core.computation.expressions import *

pandas/computation/ops.py

@@ -0,0 +1 @@
+from pandas.core.computation.ops import *

pandas/computation/pytables.py

@@ -0,0 +1 @@
+from pandas.core.computation.pytables import *

pandas/computation/scope.py

@@ -0,0 +1 @@
+from pandas.core.computation.scope import *

pandas/tools/hashing/__init__.py

@@ -0,0 +1,10 @@
+import warnings
+
+
+warnings.warn(
+    "The pandas.types module is deprecated and will be removed in a future "
+    "version. Please import from the pandas.core.dtypes module instead.",
+    FutureWarning, stacklevel=2
+)
+
+from pandas.util.hashing import *

pandas/types/__init__.py

@@ -0,0 +1,8 @@
+import warnings
+
+
+warnings.warn(
+    "The pandas.types module is deprecated and will be removed in a future "
+    "version. Please import from the pandas.core.dtypes module instead.",
+    FutureWarning, stacklevel=2
+)

pandas/types/api.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.api import *

pandas/types/cast.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.cast import *

pandas/types/common.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.common import *

pandas/types/concat.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.concat import *

pandas/types/dtypes.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.dtypes import *

pandas/types/generic.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.generic import *

pandas/types/inference.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.inference import *

pandas/types/missing.py

@@ -0,0 +1 @@
+from pandas.core.dtypes.missing import *