Extract data from vtu to excel

Hello Expert,
I want to extract data from the VTU file (attached) in the csv file
I tried to write a Python script (attached) to read my VTU file, like storing all the results, so I can do some analysis.
I found the data file in csv file but no data is coming in csv file.
could you please tell me what is the exact method or code so that we can can extract data from vtu file to csv file.
Untitled.ipynb (1.0 MB)