In modern development, different projects often require different Python versions. For example, an older legacy app might need , while a new data science project requires Python 3.12 . Managing these manually by changing global paths is error-prone. Tools like pyenv solve this by looking for a .python-version file. How the .python-version File Works
pyenv: version `3.11.5' is not installed (set by /path/to/.python-version) .python version
print "hello" (no parentheses) range(5) actually made a list of 5 numbers (wasteful!) Unicode and text handling? A nightmare of u"text" and str vs unicode . Tools like pyenv solve this by looking for a
.python-version file is a plain text file used by tools like pyenv to automatically define the Python version for a specific project directory. It ensures consistent environments across development, testing, and deployment, commonly identifying the desired version for platforms like Heroku. For more details, visit Heroku Dev Center Heroku Dev Center Specifying a Python Version - Heroku Dev Center this is not widely supported.
Some tools support a space-separated list, which sets up a "virtual environment" combining both interpreters (for tox or cross-version testing). However, this is not widely supported.