We have seen situations where one or two packages from Jaspy do not work in private virtual environments, and if you are affected by this then please see the "package-specific fixes" section below. This will work for most packages in Jaspy. If you would prefer as a starting point to have all the add-on packages which have already been installed in Jaspy, then use instead: python -m venv -system-site-packages /path/to/my_virtual_env This means, for example, that the numpy package (not in the standard library, but installed as part of Jaspy) will be unavailable unless you install it yourself. Note that if you create a virtual environment using the above syntax, the packages initially installed in it will only be those in the standard Python library. Using the system "site-packages" with your virtual environment The path can be an absolute or relative path, but it should not already exist. Note: /path/to/my_virtual_env here (and also in the commands shown below) should be replaced by the actual path where you choose to create your virtual environment.
This is done differently for python2 and python3, as follows: # Python 3 onwards: Python allows you to create a directory containing a private virtual environment, into which you can install your packages of choice. Python2.7 onwards), you should activate a Jaspy environment before following the instructions below. Creating a virtual environmentĪs a pre-requisite, when using any modern Python (i.e. It provides a very useful method for managing multiple environments on a single platform that can be used by different applications. What is a "virtual environment"?Ī "virtual environment" is a self-contained directory tree that contains a Python installation for a particular version of Python (such as 2.7, 3.7, 3.8), plus a number of additional packages. To decide whether you should use a Python virtual environment or a Conda environment for this purpose, see: overview of software environments. You might wish to do this if you want to use different packages/versions from those installed on the system, or if you have requested for a package to be installed system-wide but wish to start using it before this request can be acted upon. This article describes how you can use "virtual environments" to install Python packages that are not provided in the common software environments on JASMIN.
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