Change python version using pyenv
Reference: Building an environment with pyenv and virtualenv
Check the version that can be installed
% pyenv install --list
Installation of each version of python
$ pyenv install 3.5.0
$ pyenv install 2.7.10
Check the version of python that can be switched
% pyenv versions
system
2.7.10
* 3.5.0 (set by /Users/xxx/.pyenv/version)
Check the current version
% python --version
Python 3.5.0
Switching python version
If you set it to global, the specified version will be reflected in the whole, and if you set it to local, the specified version will be reflected in the current directory.
$ pyenv global 3.5.0
$ python --version
Python 3.5.0
$ pyenv local 2.7.10
$ python --version
Python 2.7.10
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