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.
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
compgen -c python | grep -P '^python\d'
This lists some other python things too, But hey, You can identify all python versions among them.
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
).
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).
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
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.
COMMAND: python --version && 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.
we can directly use this to see all the pythons installed both by current user and the root by the following:
whereis python
Source: Stackoverflow.com