install Python 3.8 on MacOS X

env SDKROOT="/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" CFLAGS="-I/usr/local/opt/openssl/include -I/usr/local/opt/readline/include -I/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/usr/include" CPPFLAGS="-I/usr/local/opt/zlib/include" LDFLAGS="-L/usr/local/opt/openssl/lib -L/usr/local/opt/readline/lib" pyenv install 3.8.0
brew switch readline 8.0.4
brew upgrade gawk
echo -e 'if command -v pyenv 1>/dev/null 2>&1; then\n  eval "$(pyenv init -)"\nfi' >> ~/.zshrc
pyenv install 3.8.0
pyenv global 3.8.0