Can Pandas read and modify a single Excel file worksheet (tab) without modifying the rest of the file?
Question: Many spreadsheets have formulas and formatting that Python tools for reading
and writing Excel files cannot faithfully reproduce. That means that any file
I want to create programmatically must be something I basically create from
scratch, and then other Excel files (with the aforementioned sophistication)
have to refer to that file (which creates a variety of other dependency
issues).

My understanding of Excel file 'tabs' is that they're actually just a
collection of XML files. Well, is it possible to use pandas (or one of the
underlying read/write engines such as xlsxwriter or openpyxl to modify just
one of the tabs, leaving other tabs (with more wicked stuff in there) intact?

EDIT: I'll try to further articulate the problem with an example.

  * Excel Sheet test.xlsx has four tabs (aka worksheets): Sheet1, Sheet2, Sheet3, Sheet4
  * I read Sheet3 into a DataFrame (let's call it df) using pandas.read_excel()
  * Sheet1 and Sheet2 contain formulas, graphs, and various formatting that neither openpyxl nor xlrd can successfully parse, and Sheet4 contains other data. I don't want to touch those tabs at all.
  * Sheet2 actually has some references to cells on Sheet3
  * I make some edits to df and now want to write it back to sheet3, leaving the other sheets untouched (and the references to it from other worksheets in the workbook intact)

Can I do that and, if so, how?


Answer: I had a similar question regarding the interaction between excel and python
(in particular, pandas), and I was referred to this question.

Thanks to some pointers by stackoverflow community, I found a package called
[xlwings](http://docs.xlwings.org/quickstart.html#interact-with-excel-from-
python) that seems to cover a lot of the functionalities HaPsantran required.

To use the OP's example:

Working with an existing excel file, you can drop an anchor in the data block
(Sheet3) you want to import to pandas by naming it in excel and do:

    
    
    # opened an existing excel file
    

`wb = Workbook(Existing_file)`

    
    
    # Find in the excel file a named cell and reach the boundary of the cell block (boundary defined by empty column / row) and read the cell 
    

`df = Range(Anchor).table.value`

    
    
    # import pandas and manipulate the data block
    df = pd.DataFrame(df) # into Pandas DataFrame <br>
    df['sum'] = df.sum(axis= 1)
    
    # write back to Sheet3
    Range(Anchor).value = df.values
    

# tested that this implementation didn't temper existing formula in the excel
file

Let me know if this solves your problem and if there's anything I can help.

Big kudos to the developer of xlwings, they made this possible.

