The system version of Tk is deprecated I installed python3 and tcl-tk with homebrew on my iMac. However, when I want to launch my program using the terminal, this message is displayed:


  DEPRECATION WARNING: The system version of Tk is deprecated and may be removed in a future release. Please don't rely on it. Set TK_SILENCE_DEPRECATION=1 to suppress this warning.


The interface is completely buggy on my iMac and I don't understand why and can't find a solution.

On my MacBook Air with the same homebrew apps installed the very same program works perfectly. 

Details: 


macOS Catalina 10.15.4 on both Macs
MacBook Air:

@MacBook-Air $ which python3
/Library/Frameworks/Python.framework/Versions/3.7/bin/python3
@MacBook-Air $ python3 -V
Python 3.7.3
@MacBook-Air $ which tclsh
/usr/bin/tclsh

iMac:

@iMac-de-Lola.local $ which python3
/usr/local/bin/python3
@iMac-de-Lola.local $ python3 -V
Python 3.7.7
@iMac-de-Lola.local $ which tclsh
/usr/bin/tclsh
I managed to solve the problem by installing python 3.7.7 from python.org. The path is now the same as on my MacBook Air. 

The program is working very well now. I think the python3 command launches a system version of python and not the version installed by homebrew.