Using _shared_doc_kwargs for versionadded

Author: s-celles

pandas/core/frame.py

@@ -105,7 +105,8 @@
     axes_single_arg="{0 or 'index', 1 or 'columns'}",
     optional_by="""
         by : str or list of str
-            Name or list of names which refer to the axis items.""")
+            Name or list of names which refer to the axis items.""",
+    versionadded_to_excel='')
 
 _numeric_only_doc = """numeric_only : boolean, default None
     Include only float, int, boolean data. If None, will attempt to use

pandas/core/generic.py

@@ -1019,7 +1019,7 @@ def __setstate__(self, state):
     _shared_docs['to_excel'] = """
     Write %(klass)s to a excel sheet
 
-    .. versionadded:: 0.20.0
+    %(versionadded_to_excel)s
 
     Parameters
     ----------

pandas/core/series.py

@@ -80,7 +80,8 @@
     inplace="""inplace : boolean, default False
         If True, performs operation inplace and returns None.""",
     unique='np.ndarray', duplicated='Series',
-    optional_by='')
+    optional_by='',
+    versionadded_to_excel='.. versionadded:: 0.20.0')
 
 
 def _coerce_method(converter):