I have the following code, and I am trying to write a data frame into an "existing" worksheet of an Excel file (referred here as test.xlsx). Sheet3 is the targeted sheet where I want to place the data, and I don't want to replace the entire sheet with a new one.
df = pd.DataFrame({'Data': [10, 20, 30, 20, 15, 30, 45]})
book = load_workbook('test.xlsx')
writer = pd.ExcelWriter('test.xlsx')
writer.book = book
writer.sheets = dict((ws.title, ws) for ws in book.worksheets) # *I am not sure what is happening in this line*
df.to_excel(writer,"Sheet3",startcol=0, startrow=20)
When I am running the code line by line, I am getting this error for the last line:
AttributeError: 'Workbook' object has no attribute 'add_worksheet'. Now why am I seeing this error when I am not trying to add worksheet ?
Note: I am aware of this similar issue Python How to use ExcelWriter to write into an existing worksheet but its not working for me and I can't comment on that post either.
You can use the append_df_to_excel()
helper function, which is defined in this answer:
Usage:
append_df_to_excel('test.xlsx', df, sheet_name="Sheet3", startcol=0, startrow=20)
Some details:
**to_excel_kwargs
- used in order to pass additional named parameters to df.to_excel()
like i did in the example above - parameter startcol
is unknown to append_df_to_excel()
so it will be treated as a part of **to_excel_kwargs
parameter (dictionary).
writer.sheets = {ws.title:ws for ws in writer.book.worksheets}
is used in order to copy existing sheets to writer
openpyxl object. I can't explain why it's not done automatically when reading writer = pd.ExcelWriter(filename, engine='openpyxl')
- you should ask authors of openpyxl
module about that...
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