Python if statement docx wount work

[Selfiatus1]

Hi,

I cant get this code to work, I just want a button to be pressed, calling definition "helloCallBack" and from it a series of
if statements, whereas, if a variable is a string then write that string to the document..

It just woun't work, what am I doing wrong?

def helloCallBack():

   if tkvar == 'Broker':
      document = Document()
      document.add_heading("Broker")
      document.save('agreement034.docx')

Kr.
Selfiatus1

...and yes I do have installed docx and tkinter modules.

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It woun't write text to the document, can anyone help please?