[FIXED] Adding sheets to an existing Excel File via Python

Issue

i'm working with a gui in Python, which i created via tkinter. Now i want to save some data(that i stored in a two dimensional List) in an excel file. I'm trying to do that in one function.

Here is the Code that i use

    def Convert(self):

        list_data_conv = self.list_data

        df=pd.DataFrame(list_data_conv)

        excel_file = '{0}.xlsx'.format(self.Entry_ExcelName.get())
        
        if (self.excel_file_old==excel_file):
            writer = pd.ExcelWriter(excel_file, engine='openpyxl')
        
        else:
            writer  = pd.ExcelWriter(excel_file, engine='xlsxwriter')

        self.excel_file_old=excel_file

        sheet_name = '{0}'.format(self.Entry_SheetName.get())

       

        df.to_excel(writer, sheet_name=sheet_name)

        writer.save()

Using this code, everything works fine except that it still overwrites the Existing Sheet in the Excel File.

Is there a simple fix?

Solution

The ExcelWriter's default mode is "write", in order to append to it, set mode to append ('a').

Just replace it with :

writer  = pd.ExcelWriter(excel_file, engine='openpyxl', mode='a')

If the code line above didn't work, try:

writer  = pd.ExcelWriter(r'excel_file', engine='openpyxl', mode='a')

Sould work now.

Answered By - Nova