From 2a71609af953dd69fa6d17e1a2176ca8b4533701 Mon Sep 17 00:00:00 2001
From: Jeff Reback <jeff.reback@twosigma.com>
Date: Mon, 24 Apr 2017 22:07:26 -0400
Subject: [PATCH 1/2] REGR: bug in moments when using bottleneck

closes #16116
---
 pandas/core/nanops.py                |  1 +
 pandas/tests/frame/test_analytics.py | 16 ++++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/pandas/core/nanops.py b/pandas/core/nanops.py
index 5ce302967de24..32d9ca791ba08 100644
--- a/pandas/core/nanops.py
+++ b/pandas/core/nanops.py
@@ -381,6 +381,7 @@ def nanstd(values, axis=None, skipna=True, ddof=1):
 @bottleneck_switch(ddof=1)
 def nanvar(values, axis=None, skipna=True, ddof=1):
 
+    values = _values_from_object(values)
     dtype = values.dtype
     mask = isnull(values)
     if is_any_int_dtype(values):
diff --git a/pandas/tests/frame/test_analytics.py b/pandas/tests/frame/test_analytics.py
index cd98460d8609c..ad82bab02ec0c 100644
--- a/pandas/tests/frame/test_analytics.py
+++ b/pandas/tests/frame/test_analytics.py
@@ -591,6 +591,22 @@ def test_numeric_only_flag(self):
             pytest.raises(TypeError, lambda: getattr(df2, meth)(
                 axis=1, numeric_only=False))
 
+    def test_mixed_ops(self):
+        # GH 16116
+        df = DataFrame({'int': [1, 2, 3, 4],
+                        'float': [1., 2., 3., 4.],
+                        'str': ['a', 'b', 'c', 'd']})
+
+        for op in ['mean', 'std']:
+            result = getattr(df, op)()
+            assert len(result) == 2
+
+            if nanops._USE_BOTTLENECK:
+                nanops._USE_BOTTLENECK = False
+                result = getattr(df, op)()
+                assert len(result) == 2
+                nanops._USE_BOTTLENECK = True
+
     def test_cumsum(self):
         self.tsframe.loc[5:10, 0] = nan
         self.tsframe.loc[10:15, 1] = nan

From 15afc097113b794693391f290d70792871a8e050 Mon Sep 17 00:00:00 2001
From: Jeff Reback <jeff.reback@twosigma.com>
Date: Mon, 24 Apr 2017 22:21:03 -0400
Subject: [PATCH 2/2] add fixes for kurt/skew

---
 pandas/core/nanops.py                | 2 ++
 pandas/tests/frame/test_analytics.py | 3 ++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/pandas/core/nanops.py b/pandas/core/nanops.py
index 32d9ca791ba08..e9be43b184537 100644
--- a/pandas/core/nanops.py
+++ b/pandas/core/nanops.py
@@ -490,6 +490,7 @@ def nanskew(values, axis=None, skipna=True):
 
     """
 
+    values = _values_from_object(values)
     mask = isnull(values)
     if not is_float_dtype(values.dtype):
         values = values.astype('f8')
@@ -544,6 +545,7 @@ def nankurt(values, axis=None, skipna=True):
     central moment.
 
     """
+    values = _values_from_object(values)
     mask = isnull(values)
     if not is_float_dtype(values.dtype):
         values = values.astype('f8')
diff --git a/pandas/tests/frame/test_analytics.py b/pandas/tests/frame/test_analytics.py
index ad82bab02ec0c..0941f0af6bec5 100644
--- a/pandas/tests/frame/test_analytics.py
+++ b/pandas/tests/frame/test_analytics.py
@@ -597,7 +597,8 @@ def test_mixed_ops(self):
                         'float': [1., 2., 3., 4.],
                         'str': ['a', 'b', 'c', 'd']})
 
-        for op in ['mean', 'std']:
+        for op in ['mean', 'std', 'var', 'skew',
+                   'kurt', 'sem']:
             result = getattr(df, op)()
             assert len(result) == 2