[TriEmbed] Python print problem

[Pete soper]

I have some python code that has this statement:

         print(f'C: {degrees_c:6.2f} F: {degrees_f:6.2f}')

If I run the script from an Ubuntu bash terminal session I get the two 
temperatures as expected. But if I redirect the output I get nothing. 
For instance these two commands result in zero output to the terminal or 
log file:

     ./edgerBMP3XX.py >log

     ./edgerBMP3XX.py | tee -a log

What am I doing wrong? The version is 3.8.10.

Pete