While users are encouraged to use our versions of Python detailed above, there is absolutely nothing stopping you from using /usr/bin/python. This removes the need to fiddle with PYTHONPATH. We decided to make a clean break from this practice in CentOS 7, and simply install our own version of Python 2.7 (/usr/local/bin/python2.7). In RHEL6, we used a hybrid type of package management system where we installed custom packages to a network location and then instructed users on an individual-user basis to modify their PYTHONPATH variable to utilize our custom packages with the system version of Python. We've observed in our previous operating system, RHEL6, that most users want cutting edge Python packages. This version relies on locally installed packages, most of which also come from RPMs, some of which are usually somewhat outdated. Now load the module for Python 3.*, and try again (note for python 3, you will need to use the "python3" ~]# module load ~]# which ~]# python3 -VĬentOS 7 comes with /usr/bin/python (version 2.7). Observe the effect of the module ~]# which python But if you have pre-existing code that uses, for example, "#!/usr/bin/env python", you will want "python" to point to the right version.
For example, /usr/local/bin contains "python#.#" for each specific version. The most significant advantage to using a module file is that the command "python" becomes associated with the appropriate binary. You may use whichever you prefer or find more convenient.
We've configured our CentOS 7 system to be compatible with either usage of /usr/local/bin symlinks, or with module files. To understand what effect running a module file has, see it's corresponding module file in /usr/local/etc/modulefiles/. stow/python-3.*/bin/python3.*Īlternatively, you can load each version of Python's respective module (see Module System): These are symlinks to their full installation trees in /usr/local/stow/. In most cases, you'll want to use one of our custom-built installations: There are several options for using Python in CentOS 7. For example, in python 3.*, the * could be substituted for 6 for Python 3.6, and so on.
* refers to any available minor version of the major version (Python 2 and Python 3 are major).
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