Pandas存储为Excel格式：单个xlsx文件下多sheet存储方法

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 = pd.ExcelWriter('output.xlsx')

>>> df1.to_excel(writer,'Sheet1')

>>> df2.to_excel(writer,'Sheet2')

>>> writer.save()

For compatibility with to_csv, to_excel serializes lists and dicts to strings before writing.

摘自  http://pandas.pydata.org/pandas-docs/stable/generated/pandas.DataFrame.to_excel.html#pandas.DataFrame.to_excel