python@3.8 is keg-only, which means it was not symlinked into /usr/local,
because this is an alternate version of another formula.
If you need to have python@3.8 first in your PATH run:
echo 'export PATH="/usr/local/opt/python@3.8/bin:$PATH"' >> ~/.zshrc
For compilers to find python@3.8 you may need to set:
export LDFLAGS="-L/usr/local/opt/python@3.8/lib"
For pkg-config to find python@3.8 you may need to set:
export PKG_CONFIG_PATH="/usr/local/opt/python@3.8/lib/pkgconfig"
➜ ~ python --version
zsh: command not found: python3.8
➜ ~ vim .zshrc
➜ ~ source .zshrc
➜ ~ echo 'export PATH="/usr/local/opt/python@3.8/bin:$PATH"' >> ~/.zshrc
➜ ~ source .zshrc
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