How to check all versions of python installed on osx and centos

Question

I just started setting up a centos server today and noticed that the default version of python on centos is set to 2 6 6  I want to use python 2 7 instead  I googled around and found that 2 6 6 is used by system tools such as YUM so I should not tamper with it  Then I opened up a terminal on my mac and found that I had python 2 6 8 and 2 7 5 and 3 3 3 installed  Sorry for the long story  In short I just want to know how to lookup all the version of python installed on centos so I don t accidentally install it twice

User · Answer

compgen -c python   grep -P   python d   This lists some other python things too  But hey  You can identify all python versions among them

User · Answer

we can directly use this to see all the pythons installed both by current user and the root by the following                                    whereis python

User · Answer

The more easy way its by executing the next command   ls -ls  usr bin python    Output look like this    usr bin python            usr bin python2 7         usr bin pythonw  usr bin python-config     usr bin python2 7-config  usr bin pythonw2 7

User · Answer

Here is a cleaner way to show them  technically without symbolic links    ls -1  usr bin python    grep   2-3   0-9      Where grep filters the output of ls that that has that numeric pattern at the end         Or using find   find  usr bin python    -type l   Which shows all the different     of symbolic link type  -type l

User · Answer

COMMAND  python --version  amp  amp  python3 --version  OUTPUT      Python 2 7 10    Python 3 7 1   ALIAS COMMAND  pyver  OUTPUT      Python 2 7 10    Python 3 7 1   You can make an alias like  pyver  in your  bashrc file or else using a text accelerator like AText maybe

User · Answer

Use  yum list installed command to find the packages you installed

User · Answer

As someone mentioned in a comment  you can use which python if it is supported by CentOS  Another command that could work is whereis python  In the event neither of these work  you can start the Python interpreter  and it will show you the version  or you could look in  usr bin for the Python files  python  python3 etc

User · Answer

Find out which version of Python is installed by issuing the command  python --version        python --version     Python 2 7 10  If you see something like this  Python 2 7 is your default version  You can also see if you have Python 3 installed     python3 --version Python 3 7 2   If you also want to know the path where it is installed  you can issue the command  which  with python and python3     which python  usr bin python    which python3  usr local bin python3

User · Answer

It depends on your default version of python setup  You can query by Python Version   python3 --version   to check which version of python3 is installed on your computer python2 --version    to check which version of python2 is installed on your computer python --version    it shows your default Python installed version

[python] How to check all versions of python installed on osx and centos

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