Python 3.9.0 installation

3.9.0

$ pyenv install 3.9.0

pyenv global 3.9.0

pyenv global 3.9.0
$ pyenv global
3.9.0
$ python
Python 3.9.0 (default, Oct  6 2020, 16:10:00)
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
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