python not using tkinter 8.6 installed with homebrew on Mac

Question

I am using python 3.9.1 on Mac OS 10.15.7 (Catalina). Python was installed with homebrew. When I import tkinter, I get version 8.5.9, and I want version 8.6 instead.

brew info tcl-tk gives

tcl-tk: stable 8.6.10 (bottled) [keg-only]
Tool Command Language
https://www.tcl-lang.org
/usr/local/Cellar/tcl-tk/8.6.10 (3,022 files, 50.9MB)
  Poured from bottle on 2020-03-10 at 17:57:25
From: https://github.com/Homebrew/homebrew-core/blob/HEAD/Formula/tcl-tk.rb
License: TCL
==> Dependencies
Required: [email protected] ✔
==> Caveats
tcl-tk is keg-only, which means it was not symlinked into /usr/local,
because macOS already provides this software and installing another version in
parallel can cause all kinds of trouble.

If you need to have tcl-tk first in your PATH run:
  echo 'export PATH="/usr/local/opt/tcl-tk/bin:$PATH"' >> /Users/saul/.bash_profile

For compilers to find tcl-tk you may need to set:
  export LDFLAGS="-L/usr/local/opt/tcl-tk/lib"
  export CPPFLAGS="-I/usr/local/opt/tcl-tk/include"

For pkg-config to find tcl-tk you may need to set:
  export PKG_CONFIG_PATH="/usr/local/opt/tcl-tk/lib/pkgconfig"

==> Analytics
install: 362,394 (30 days), 390,184 (90 days), 474,512 (365 days)
install-on-request: 9,609 (30 days), 17,845 (90 days), 60,715 (365 days)
build-error: 0 (30 days)

I put the suggested lines in my bash_profile but they don't seem to have had any effect.

>>> import tkinter
>>> tcl = tkinter.Tcl()
>>> print(tcl.call("info", "patchlevel"))
8.5.9

I found a lot of stuff about this issue online, but it all seemed to be related to pyenv, which I don't use, and I couldn't pick out anything other than what's described above that seemed to related to my situation.

What do I need to do?

EDIT

I tried adding the lines to my .bashrc file also, but that had no effect.

Answer 1

Apparently my python was outdated. (I never thought of that, since it was from last month.) Anyway,

brew update && brew upgrade [email protected]

fixed things.