Is it impossible to swap Python versions with pyenv?

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No, it is possible to swap Python versions with pyenv. Pyenv allows the user to easily switch between different versions of Python installed on their system, including global and local versions. The command "pyenv global <version>" sets the global Python version, while "pyenv local <version>" sets the local Python version for a specific directory. Additionally, pyenv also supports virtual environments, allowing users to isolate packages and dependencies for individual projects.