从Python调用Excel用户定义的函数总是返回None

Question

I'm trying to get the return value from an Excel function that i called from a python. I always get a None value.

Here is the excel function :

Public Function GetString()
    GetString = "aa"
End Function

And Here is the call :

xlApp.Run('ThisWorkbook.GetString')

Returned : None

I have no problem getting in the specified function since I tried to modify a cell value from it and it worked.

Am I missing anything ?

Answer 1

It is not clear how you assigned your variable xlApp . Assuming code like

import win32com.client
xl = win32com.client.Dispatch("Excel.Application")
xlApp = xlApp.Application

consider:

1. You have to assign the result to a variable, as in

   myStr = xlApp.Run('ThisWorkbook.GetString')

2. You seem to have placed the user defined function in ThisWorkbook , in the Excel file. Unless this is intentional, open the Excel file, insert a Module in the Visual Basic Editor, and move there your Function. Modify your call from Python accordingly.

3. You may want to define the function as

   Public Function GetString() as String

See How to call Excel VBA functions and subs using Python win32com?