Install Python Using Pyenv

All unofficial language installers are provided for your convenience. The scripts are provided as-is and may not be updated or maintained by Ultra.cc. Clients are welcome to use and customize unofficial scripts for their unique needs and requirements. Unofficial support may be offered via Discord only and at the sole discretion of Ultra.cc staff. Use at your own risk.

Pyenv lets you easily switch between multiple versions of Python. It is simple, unobtrusive, and follows the UNIX tradition of single-purpose tools that do one thing well.

At a high level, pyenv intercepts Python commands using shim executables injected into your PATH, determines which Python version has been specified by your application, and passes your commands along to the correct Python installation.

For more information, visit the pyenv GitHub repository.

Pyenv and Python3 Installation Script

Connect to your Ultra service via SSH.
Once connected, execute the following command:

bash <(wget -qO- https://scripts.ultra.cc/util-v2/LanguageInstaller/Python-Installer/main.sh)

Select the Python version to install by typing 1, 2, 3, 4 or 5 and then press ENTER.

Wait while the script download and install the necessary files.

To load Python with pyenv in your shell, execute the following command:

source ~/.profile

Check which Python binary you are currently using by executing which python.

The below output is what you should see.

ultradocs@pollux:~$ which python
/home/ultradocs/.pyenv/shims/python

Pyenv Usage Guide

In this section, you will learn some basic usage of pyenv. If you are looking for pip usage instructions, see this guide.

List Installed Python Versions

Execute the following command:

pyenv versions

Assuming that you used the script to install python 3.9, the output will look like this:

ultradocs@pollux:~$ pyenv versions
  system
* 3.9.13 (set by /home/ultradocs/.pyenv/version)
ultradocs@pollux:~$

The * beside 3.9.13 means that pyenv has set it as the global python version.

Install other Python versions using Pyenv

Execute the following command:

pyenv install --list | grep -E " 3.[8-9].*| 3.10.*"

It will list all versions of python from version 3.8 to version 3.10 available for install via pyenv.
Example output:

ultradocs@pollux:~$ pyenv install --list | grep -E " 3.[8-9].*| 3.10.*"
  3.8.0
  3.8-dev
  3.8.1
  3.8.2
  3.8.3
  3.8.4
  3.8.5
  3.8.6
  3.8.7
  3.8.8
  3.8.9
  3.8.10
  3.8.11
  3.8.12
  3.8.13
  3.9.0
  3.9-dev
  3.9.1
  3.9.2
  3.9.4
  3.9.5
  3.9.6
  3.9.7
  3.9.8
  3.9.9
  3.9.10
  3.9.11
  3.9.12
  3.9.13
  3.10.0
  3.10-dev
  3.10.1
  3.10.2
  3.10.3
  3.10.4
ultradocs@pollux:~$

You can install any one of them easily with the following command:

pyenv install -v <version number>

For example:
pyenv install -v 3.10.4

Since I have also installed python 3.10.4, my pyenv versions output looks like this:

ultradocs@pollux:~$ pyenv install -v 3.10.4
ultradocs@pollux:~$ pyenv versions
  system
  3.10.4
* 3.9.13 (set by /home/ultradocs/.pyenv/version)

Notice that pyenv is still using 3.9.13 as the global python version.
This can be changed with the following command:

pyenv global <version>

For example:
pyenv global 3.10.4

Now pyenv will set python 3.10.4 as the global version.
Example output:

ultradocs@pollux:~$ pyenv global 3.10.4
ultradocs@pollux:~$ pyenv versions
  system
* 3.10.4 (set by /home/ultradocs/.pyenv/version)
  3.9.13
ultradocs@pollux:~$ python -V
Python 3.10.4

Uninstall a Python version using Pyenv

Again, list your installed python versions and uninstall using the command given below:

ultradocs@pollux:~$ pyenv versions
  system
* 3.10.4 (set by /home/ultradocs/.pyenv/version)
  3.9.13
ultradocs@pollux:~$ pyenv uninstall 3.9.13
pyenv: remove /home/ultradocs/.pyenv/versions/3.9.13? [y|N] y
pyenv: 3.9.13 uninstalled

We basically upgraded to python 3.10.4 and removed python 3.9.13.

Uninstall Pyenv and the Python version(s) installed by it

Execute the following command:

bash <(wget -qO- https://scripts.ultra.cc/util-v2/LanguageInstaller/Python-Installer/main.sh)

Manual Uninstallation

Execute the following command:

rm -rf ~/.pyenv

Open ~/.profile for editing with the following SSH command:

nano ~/.profile

Remove the following lines from it:

export PYENV_ROOT="$HOME/.pyenv"
export PATH="$PYENV_ROOT/bin:$PATH"
eval "$(pyenv init --path)"

Use the key combination Ctrl + O and press Enter to save the changes.
Then, use the key combination Ctrl + X to exit the nano text editor.
Load your new ~/.profile with the following SSH command:

source ~/.profile

If you require further assistance, you can open a support ticket here!

Feedback and suggestions regarding this article are welcome on our Discord server

Install Python Using Pyenv
Pyenv and Python3 Installation Script
Pyenv Usage Guide
List Installed Python Versions
Install other Python versions using Pyenv
Uninstall a Python version using Pyenv
Uninstall Pyenv and the Python version(s) installed by it
Manual Uninstallation