如何使用 xlsxwriter 在没有 dataframe 的情况下写入 excel 文件

Question

If my dataframe is empty then I simply need to create empty excel file and write in it "There is no data for selected timeframe "

folder_list = ['San Diego', 'Vista']
if not df.empty:
    # if daraframe is not empty then do this:
    for location, d in df.groupby('OfficeLocation'):
        for folder in folder_list:
            if folder == location: 
                writer=pd.ExcelWriter(f'\\\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\{folder}\{location}.xlsx',engine='xlsxwriter')                  
            else: 
                print('df is empty')
            writer.save()
# if dataframe is empty I need to create empty excel file and wirte in cell A1 "There is no data for seleted timeframe"
else:
    for folder in folder_list:
        # this creates empty file with sheet name 'Sheet1'
        writer=pd.ExcelWriter(f'\\\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\{folder}\{folder}.xlsx',engine='xlsxwriter') 
        wb = writer.book
        ws = writer.sheets['Sheet1'] # this gives me an error
        writer.save()

Error:

Traceback (most recent call last):
  File "\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\tempCodeRunnerFile.py", line 41, in <module>
    ws = writer.sheets['Sheet1'] # this gives me an error
KeyError: 'Sheet1'

Answer 1

You should be adding a new sheet instead:

for folder in folder_list:
    # this creates empty file with sheet name 'Sheet1'
    writer=pd.ExcelWriter(f'\\\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\{folder}\{folder}.xlsx', engine='xlsxwriter') 
    wb = writer.book
    ws = wb.add_worksheet() # change to this
    writer.save()

See relevant documentation here: https://xlsxwriter.readthedocs.io/workbook.html#add_worksheet

If you were to user the default openpyxl engine, then the respective method is:

ws = wb.create_sheet()

Answer 2

Why you don't simply create it in the same loop like this.

folder_list = ['San Diego', 'Vista']

# if daraframe is not empty then do this:
for location, d in df.groupby('OfficeLocation'):
    for folder in folder_list:
        if folder == location:
           if not df.empty: 
                writer=pd.ExcelWriter(f'\\\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\{folder}\{location}.xlsx',engine='xlsxwriter')                  
            else:
                writer=pd.ExcelWriter(f'\\\\my\username\Documents\Python\Split DataFrame by Multiple dataframes\{folder}\{folder}.xlsx',engine='xlsxwriter') 
                df_empty = pd.DataFrame({"There is no data for seleted timeframe" : []})
                df_empty.to_excel(writer, index=False)
                print('df is empty')
            writer.save()

But with your method you create a new file each times.