ENH: Pandas Series provide to_excel method

Closes pandas-dev#8825

Author: s-celles

doc/source/whatsnew/v0.20.0.txt

@@ -49,7 +49,7 @@ Other enhancements
 ^^^^^^^^^^^^^^^^^^
 
 - ``pd.read_excel`` now preserves sheet order when using ``sheetname=None`` (:issue:`9930`)
-
+- ``Series`` provides a ``to_excel`` method to output Excel files (:issue:`8825`)
 
 .. _whatsnew_0200.api_breaking:
 

pandas/core/series.py

@@ -2619,6 +2619,72 @@ def to_csv(self, path=None, index=True, sep=",", na_rep='',
         if path is None:
             return result
 
+    def to_excel(self, excel_writer, sheet_name='Sheet1', na_rep='',
+                 float_format=None, columns=None, header=True, index=True,
+                 index_label=None, startrow=0, startcol=0, engine=None,
+                 merge_cells=True, encoding=None, inf_rep='inf', verbose=True):
+        """
+        Write Series to a excel sheet
+
+        Parameters
+        ----------
+        excel_writer : string or ExcelWriter object
+            File path or existing ExcelWriter
+        sheet_name : string, default 'Sheet1'
+            Name of sheet which will contain DataFrame
+        na_rep : string, default ''
+            Missing data representation
+        float_format : string, default None
+            Format string for floating point numbers
+        columns : sequence, optional
+            Columns to write
+        header : boolean or list of string, default True
+            Write out column names. If a list of string is given it is
+            assumed to be aliases for the column names
+        index : boolean, default True
+            Write row names (index)
+        index_label : string or sequence, default None
+            Column label for index column(s) if desired. If None is given, and
+            `header` and `index` are True, then the index names are used. A
+            sequence should be given if the DataFrame uses MultiIndex.
+        startrow :
+            upper left cell row to dump data frame
+        startcol :
+            upper left cell column to dump data frame
+        engine : string, default None
+            write engine to use - you can also set this via the options
+            ``io.excel.xlsx.writer``, ``io.excel.xls.writer``, and
+            ``io.excel.xlsm.writer``.
+        merge_cells : boolean, default True
+            Write MultiIndex and Hierarchical Rows as merged cells.
+        encoding: string, default None
+            encoding of the resulting excel file. Only necessary for xlwt,
+            other writers support unicode natively.
+        inf_rep : string, default 'inf'
+            Representation for infinity (there is no native representation for
+            infinity in Excel)
+
+        Notes
+        -----
+        If passing an existing ExcelWriter object, then the sheet will be added
+        to the existing workbook.  This can be used to save different
+        DataFrames to one workbook:
+
+        >>> writer = ExcelWriter('output.xlsx')
+        >>> s.to_excel(writer,'Sheet1')
+        >>> s.to_excel(writer,'Sheet2')
+        >>> writer.save()
+
+        For compatibility with to_csv, to_excel serializes lists and dicts to
+        strings before writing.
+        """
+        from pandas.core.frame import DataFrame
+        df = DataFrame(self)
+        df.to_excel(excel_writer, sheet_name, na_rep,
+                    float_format, columns, header, index,
+                    index_label, startrow, startcol, engine,
+                    merge_cells, encoding, inf_rep, verbose)
+
     def dropna(self, axis=0, inplace=False, **kwargs):
         """
         Return Series without null values

pandas/io/tests/test_excel.py

@@ -1051,6 +1051,12 @@ def test_roundtrip(self):
             recons = read_excel(path, index_col=0)
             tm.assert_frame_equal(self.frame, recons)
 
+            # GH 8825 Pandas Series should provide to_excel method
+            s = self.frame["A"]
+            s.to_excel(path)
+            recons = read_excel(path, index_col=0)
+            tm.assert_frame_equal(s.to_frame(), recons)
+
     def test_mixed(self):
         _skip_if_no_xlrd()