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I found that when I just type python in the command line, I got Python 2.7.9. And when I type module load python and then python again, it gives me Python 2.7.12 :: Anaconda custom (64-bit), which is the version I need. Can anyone explain how it happens? And what can I do to make version 2.7.12 default when I simply type 'python'?

Xavier Delaruelle
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Hui Kong
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    Where is the `module` command coming from? That's not part of Python itself, so I can't tell you how it's working. Can you elaborate a bit on what OS and Python distribution you're using? – Blckknght Jul 20 '17 at 22:59
  • I am working on a shared host (computer center). It should be a Linux system. And from what I learned from the web, module seems to be something that control different versions of software. I just use it on the command line, and not sure what it really is. – Hui Kong Jul 29 '17 at 05:36

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firstly what do you mean "module load python" ?

another point, changing $PATH variable, you can set default python version.When you type 'python',terminal searches it in $PATH and few various directory.Therefore remove path which refers old version in $PATH ,then add new path which refer to Python 2.7.12,For this use this

Place export declaration in ~/.bashrc. 

export PATH=/opt/local/bin:/opt/local/sbin:/usr/local/bin:/usr/bin:/bin:/u:$PATH

But the above solution may not work,thus use this simple way alias.Like below

Place this into ~/.bashrc file

alias python=Python 2.7.12
Fatih Altuntaş
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  • Module is a command that can control different versions of software. I was told by others to use it on the command line, and not sure what it really is. – Hui Kong Jul 29 '17 at 05:40
  • I think what you said is the correct answer, and it works.on personal computer. But I don't have permission to change the .bashrc files on the host. I am still searching for other solutions (maybe ask people in charge to do that) – Hui Kong Jul 29 '17 at 05:44
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The module command helps to activate/deactivate specific software version in your running shell. This command interprets scripts that are called modulefiles containing some environment definition to enable a specific version of a software, like for instance by altering the PATH variable.

You can learn what a modulefile does by displaying its content, in your situation:

$ module display python

The environment setup done by the module command is not persistent and it should be renewed if you start a new shell session. To get python 2.7.12 by default, you should edit your shell configuration file to automatically load this modulefile when shell is started.

Xavier Delaruelle
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