Warning: Do not use the PYTHONHOME environment variable. If it is set on your system, remove it following the guidelines below. It is extremely fragile, and if you know enough to use it safely, then you know much more than enough to need this article.

Its purpose, quickly swapping among Python installations, is almost always better accomplished by modifying the PATH environment variable or by directly referencing the desired Python executable. Background Setting the PYTHONPATH environment variable is an easy way to make Python modules available for import from any directory. This environment variable can list one or more directory paths which contain your own modules. On Windows, multiple paths are separated by semicolons.

Pyenv (previously known as pythonbrew)- to put it simply, it’s Python version management tool. Penv lets you have multiple Python installations i.e. Multiple Python versions, from which you can set the global Python version (the default version to use), and also the local Python version i.e. Project specific.Apart from this you can also create virtualenv – it has a separate sub-command for it.

On Mac OS or Linux, they are separated by colons. PYTHONPATH is typically used during early development, before you write a setup.py module for your package and use it to install your package into a Python installation. PYTHONPATH should not be used to import packages from one Python installation into another one -- while this will sometimes work, it can lead to unexplained crashes and other bugs. If you want to use the same package in two Python installations, install it into each of them, separately.

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(There are some exceptions with 3rd party packages that are shipped only as part of a Python installation, and which you wish to reference from another Python installation, but this should be avoided whenever possible.) There is no difference in how Canopy uses PYTHONPATH compared to how EPD or any other Python distribution uses it. You put your code somewhere, point PYTHONPATH to it, and Canopy sees it. What can be different is how you set PYTHONPATH (or any other environment variable required by your Python program).

It's always been easy, and it remains so, to set environment variables in a terminal (a.k.a. Shell or command prompt) session, and if you run a program using Canopy Python from such a session, then there is no change at all with Canopy. Likewise if you start the Canopy GUI from a terminal session, it will inherit PYTHONPATH from that session (see the final section of this article). But if you are starting Canopy from the OS's GUI environment (start menu, desktop shortcut, Spotlight, etc), rather than from a terminal, then PYTHONPATH (or other environment variables required by your Python program) must be set in the OS's GUI.

This article describes several ways to set such environment variables so that they will be visible in Canopy. You only need to do one of these methods. If you need to remove existing paths from an environment variable, then Method B is usually the best choice. Method A: IPython configuration Create ~/.ipython/profile_default/startup/00-startup.py (on Windows, replace '~' by your home directory) containing lines like: import sys,os,os.path sys.path.append(os.path.expanduser('~/code/eol_hsrl_python')) os.environ['HSRL_INSTRUMENT']='gvhsrl' os.environ['HSRL_CONFIG']=os.path.expanduser('~/hsrl_config') Please note: a bug in Canopy causes any errors in this file to be silently ignored. If you are not seeing the desired settings, try running 'ipython' at the command prompt to see if it reports any issues. As a side note, if you are using ipython, an alternative to setting PYTHONPATH is Tony Yu's pypath magic: Method B: Set environment variables at the GUI / desktop level Windows See the Knowledge Base article.

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