Support for OO Optimization

pandas/tests/test_downstream.py

@@ -2,6 +2,8 @@
 """
 Testing that we work in the downstream packages
 """
+import subprocess
+
 import pytest
 import numpy as np  # noqa
 from pandas import DataFrame
@@ -53,6 +55,15 @@ def test_xarray(df):
     assert df.to_xarray() is not None
 
 
+def test_xarray_oo_optimizable():
+    # GH 21071
+    ret = subprocess.run(["python", "-OO", "-c", "import pandas"])
+    result = ret.returncode
+    expected = 0
+
+    assert result == expected
+
+
 @tm.network
 def test_statsmodels():
 

pandas/tseries/offsets.py

@@ -1090,12 +1090,15 @@ def apply(self, other):
 
 
 class CustomBusinessMonthEnd(_CustomBusinessMonth):
-    __doc__ = _CustomBusinessMonth.__doc__.replace('[BEGIN/END]', 'end')
+    if _CustomBusinessMonth.__doc__:
+        __doc__ = _CustomBusinessMonth.__doc__.replace('[BEGIN/END]', 'end')
     _prefix = 'CBM'
 
 
 class CustomBusinessMonthBegin(_CustomBusinessMonth):
-    __doc__ = _CustomBusinessMonth.__doc__.replace('[BEGIN/END]', 'beginning')
+    if _CustomBusinessMonth.__doc__:
+        __doc__ = _CustomBusinessMonth.__doc__.replace('[BEGIN/END]',
+                                                       'beginning')
     _prefix = 'CBMS'
 
 

pandas/util/_decorators.py

@@ -54,10 +54,11 @@ def wrapper(*args, **kwargs):
     {rest}
     """)
     rest = getattr(wrapper, '__doc__', '')
-    docstring = tpl.format(version=version,
-                           msg='\n    '.join(wrap(msg, 70)),
-                           rest=dedent(rest))
-    wrapper.__doc__ = docstring
+    if rest:
+        docstring = tpl.format(version=version,
+                               msg='\n    '.join(wrap(msg, 70)),
+                               rest=dedent(rest))
+        wrapper.__doc__ = docstring
 
     return wrapper