Squashed commit of the following:

commit b29dfc6
Author: Tom Augspurger <[email protected]>
Date:   Thu Aug 16 10:45:38 2018 -0500

    Support NDFrame.shift with EAs

    Uses take internally.

    Closes pandas-dev#22386

commit b5d81cf
Author: William Ayd <[email protected]>
Date:   Thu Aug 16 03:54:18 2018 -0700

    Bump pytest (pandas-dev#22320)

commit f07a790
Author: jbrockmendel <[email protected]>
Date:   Thu Aug 16 03:46:58 2018 -0700

    Make more of numpy_helper unnecessary (pandas-dev#22344)

commit 7b80d4d
Author: Graham Inggs <[email protected]>
Date:   Thu Aug 16 12:43:02 2018 +0200

    Drop redundant TestLocale (pandas-dev#22349)

commit 6bcfc46
Author: Matthew Roeschke <[email protected]>
Date:   Thu Aug 16 03:32:31 2018 -0700

    Fix failing dateutil test (pandas-dev#22354)

commit 86e8f23
Author: jbrockmendel <[email protected]>
Date:   Thu Aug 16 03:08:09 2018 -0700

    remove last cython: nprofile comments (pandas-dev#22371)

commit 70e6f7c
Author: Joris Van den Bossche <[email protected]>
Date:   Wed Aug 15 18:09:50 2018 +0200

    DOC: edit docstring example to prevent segfault (pandas-dev#21824) (pandas-dev#22368)

Author: TomAugspurger

ci/environment-dev.yaml

@@ -8,7 +8,7 @@ dependencies:
   - flake8
   - flake8-comprehensions
   - moto
-  - pytest>=3.1
+  - pytest>=3.6
   - python-dateutil>=2.5.0
   - python=3
   - pytz

ci/requirements_dev.txt

@@ -5,7 +5,7 @@ NumPy
 flake8
 flake8-comprehensions
 moto
-pytest>=3.1
+pytest>=3.6
 python-dateutil>=2.5.0
 pytz
 setuptools>=24.2.0

doc/source/contributing.rst

@@ -652,13 +652,13 @@ Adding tests is one of the most common requests after code is pushed to *pandas*
 it is worth getting in the habit of writing tests ahead of time so this is never an issue.
 
 Like many packages, *pandas* uses `pytest
-<http://doc.pytest.org/en/latest/>`_ and the convenient
+<http://docs.pytest.org/en/latest/>`_ and the convenient
 extensions in `numpy.testing
 <http://docs.scipy.org/doc/numpy/reference/routines.testing.html>`_.
 
 .. note::
 
-   The earliest supported pytest version is 3.1.0.
+   The earliest supported pytest version is 3.6.0.
 
 Writing tests
 ~~~~~~~~~~~~~
@@ -702,7 +702,7 @@ Transitioning to ``pytest``
     class TestReallyCoolFeature(object):
         ....
 
-Going forward, we are moving to a more *functional* style using the `pytest <http://doc.pytest.org/en/latest/>`__ framework, which offers a richer testing
+Going forward, we are moving to a more *functional* style using the `pytest <http://docs.pytest.org/en/latest/>`__ framework, which offers a richer testing
 framework that will facilitate testing and developing. Thus, instead of writing test classes, we will write test functions like this:
 
 .. code-block:: python
@@ -766,7 +766,7 @@ A test run of this yields
 
    ((pandas) bash-3.2$ pytest  test_cool_feature.py  -v
    =========================== test session starts ===========================
-   platform darwin -- Python 3.6.2, pytest-3.2.1, py-1.4.31, pluggy-0.4.0
+   platform darwin -- Python 3.6.2, pytest-3.6.0, py-1.4.31, pluggy-0.4.0
    collected 11 items
 
    tester.py::test_dtypes[int8] PASSED
@@ -788,7 +788,7 @@ Tests that we have ``parametrized`` are now accessible via the test name, for ex
 
    ((pandas) bash-3.2$ pytest  test_cool_feature.py  -v -k int8
    =========================== test session starts ===========================
-   platform darwin -- Python 3.6.2, pytest-3.2.1, py-1.4.31, pluggy-0.4.0
+   platform darwin -- Python 3.6.2, pytest-3.6.0, py-1.4.31, pluggy-0.4.0
    collected 11 items
 
    test_cool_feature.py::test_dtypes[int8] PASSED
@@ -837,7 +837,7 @@ On Windows, one can type::
 This can significantly reduce the time it takes to locally run tests before
 submitting a pull request.
 
-For more, see the `pytest <http://doc.pytest.org/en/latest/>`_ documentation.
+For more, see the `pytest <http://docs.pytest.org/en/latest/>`_ documentation.
 
     .. versionadded:: 0.20.0
 

doc/source/install.rst

@@ -202,15 +202,15 @@ pandas is equipped with an exhaustive set of unit tests, covering about 97% of
 the code base as of this writing. To run it on your machine to verify that
 everything is working (and that you have all of the dependencies, soft and hard,
 installed), make sure you have `pytest
-<http://doc.pytest.org/en/latest/>`__ and run:
+<http://docs.pytest.org/en/latest/>`__ >= 3.6 and run:
 
 ::
 
     >>> import pandas as pd
     >>> pd.test()
     running: pytest --skip-slow --skip-network C:\Users\TP\Anaconda3\envs\py36\lib\site-packages\pandas
     ============================= test session starts =============================
-    platform win32 -- Python 3.6.2, pytest-3.2.1, py-1.4.34, pluggy-0.4.0
+    platform win32 -- Python 3.6.2, pytest-3.6.0, py-1.4.34, pluggy-0.4.0
     rootdir: C:\Users\TP\Documents\Python\pandasdev\pandas, inifile: setup.cfg
     collected 12145 items / 3 skipped
 

doc/source/whatsnew/v0.23.5.txt

@@ -26,6 +26,11 @@ Fixed Regressions
 -
 -
 
+
+Development
+~~~~~~~~~~~
+- The minimum required pytest version has been increased to 3.6 (:issue:`22319`)
+
 .. _whatsnew_0235.bug_fixes:
 
 Bug Fixes

doc/source/whatsnew/v0.24.0.txt

@@ -462,6 +462,7 @@ ExtensionType Changes
 - Added ``ExtensionDtype._is_numeric`` for controlling whether an extension dtype is considered numeric (:issue:`22290`).
 - The ``ExtensionArray`` constructor, ``_from_sequence`` now take the keyword arg ``copy=False`` (:issue:`21185`)
 - Bug in :meth:`Series.get` for ``Series`` using ``ExtensionArray`` and integer index (:issue:`21257`)
+- :meth:`~Series.shift` now works with extension arrays, rather than raising an AttributeError (:isseu:`22386`)
 - :meth:`Series.combine()` works correctly with :class:`~pandas.api.extensions.ExtensionArray` inside of :class:`Series` (:issue:`20825`)
 - :meth:`Series.combine()` with scalar argument now works for any function type (:issue:`21248`)
 - Added ``ExtensionDtype._is_numeric`` for controlling whether an extension dtype is considered numeric.

pandas/_libs/algos.pyx

@@ -1,4 +1,4 @@
-# cython: profile=False
+# -*- coding: utf-8 -*-
 
 cimport cython
 from cython cimport Py_ssize_t

pandas/_libs/groupby.pyx

@@ -1,5 +1,4 @@
 # -*- coding: utf-8 -*-
-# cython: profile=False
 
 cimport cython
 from cython cimport Py_ssize_t

pandas/_libs/hashing.pyx

@@ -1,4 +1,4 @@
-# cython: profile=False
+# -*- coding: utf-8 -*-
 # Translated from the reference implementation
 # at https://github.com/veorq/SipHash
 

pandas/_libs/hashtable.pyx

@@ -1,4 +1,4 @@
-# cython: profile=False
+# -*- coding: utf-8 -*-
 
 cimport cython