to install a specific version
pyenv install 2.7.18
to check all the versions
pyenv versions
to switch between system and other versions
pyenv global 2.7.18
pyenv global system
to switch python version for local or a particular shell
pyenv local 2.7.18
pyenv shell 2.7.18
to test out the installed version
pyenv -m test
to see the current version
pyenv -V
"learn about virtual env using pyenv next"
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