writer.sheets['Validation'] = worksheet
使用原始代码：
# Creating Excel Writer Object from Pandas
writer = pd.ExcelWriter('test.xlsx',engine='xlsxwriter')
workbook=writer.book
worksheet=workbook.add_worksheet('Validation')
writer.sheets['Validation'] = worksheet
df.to_excel(writer,sheet_name='Validation',startrow=0 , startcol=0)
another_df.to_excel(writer,sheet_name='Validation',startrow=20, startcol=0)
如果我们看一下pandas函数to_excel，它将使用writerwrite_cells函数：
excel_writer.write_cells(formatted_cells, sheet_name, startrow=startrow, startcol=startcol)
所以看一下write_cells函数xlsxwriter：
def write_cells(self, cells, sheet_name=None, startrow=0, startcol=0):
# Write the frame cells using xlsxwriter.
sheet_name = self._get_sheet_name(sheet_name)
if sheet_name in self.sheets:
wks = self.sheets[sheet_name]
else:
wks = self.book.add_worksheet(sheet_name)
self.sheets[sheet_name] = wks
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