Managing Python versions¶

If you need different Python versions, just for using with Bluprint and uv, then you don’t need to do anything. uv will automatically handle installing necessary Python versions; see uv - Installing Python for details.

Switching between Python versions¶

You can use pyenv to manage Python versions. Once it is installed, use pyenv versions to see which Python versions are installed:

pyenv versions
# system
# 3.9.8
# 3.10.10
# * 3.11.2 (set by /home/igor/repos/.python-version)
# 3.12.0
# 3.12.0a5
# 3.13.0a2

Here’s how to get Python versions available to download and install:

pyenv install -l | grep '\s[0-9]'
# ...
# 3.11.2
# 3.11.3
# 3.11.4
# 3.11.5
# 3.11.6
# 3.12.0
# 3.12-dev
# 3.13.0a2
# 3.13-dev

Installing a new version, e.g. 3.13.0a2:

pyenv install 3.13.0a2
# Downloading Python-3.13.0a2.tar.xz...
# -> https://www.python.org/ftp/python/3.13.0/Python-3.13.0a2.tar.xz
# Installing Python-3.13.0a2...
# Installed Python-3.13.0a2 to /home/igor/.pyenv/versions/3.13.0a2

Once a different Python version is install you can use it

• globally using: pyenv global 3.13.0a2

• locally (whenever you are in the current directory) using pyenv local 3.13.0a2