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.

does centos have the `which` command, `which -a python`? – Padraic Cunningham May 26 '15 at 17:21 — Padraic Cunningham, May 26 '15 at 17:21
See e.g. http://stackoverflow.com/q/28288095/3001761 – jonrsharpe May 26 '15 at 17:21 — jonrsharpe, May 26 '15 at 17:21

score 133 · Answer 1 · edited Jan 15 '18 at 00:06

133

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

edited Jan 15 '18 at 00:06

Asif Raza

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answered Aug 23 '16 at 12:34

Gabriel Caceres

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This answer is not very specific, please edit it to clarify the intention. – Maurice Aug 23 '16 at 12:44
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This one did it for me. which python etc only give me the current version in use, not the other installed ones. – dorien Feb 28 '17 at 05:30
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Careful, some could be installed in usr/local too. So run this too. ls -ls /usr/local/bin/python* – OutOnAWeekend Dec 05 '17 at 20:17
With this answer i can see all the python versions installed. works perfect ubuntu 17.04 – Phares Feb 20 '18 at 07:26
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For OSX users, python2.7 comes pre-installed in /usr/bin/ but any python versions that were downloaded and installed by a user are likely in /usr/local/bin/ (see OutOnAWeekend's comment). – David Skarbrevik Oct 12 '18 at 22:10
This certainly did not give me the python 3.6.8 version installed on my system. – ayounis90 Jan 16 '19 at 23:11
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This would also miss anything in anaconda. To me, it sounds like the original question is how do you do this for your entire system, not just in usr/bin – Otherness Apr 12 '20 at 01:43

score 20 · Answer 2 · answered Jun 15 '19 at 00:51

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

answered Jun 15 '19 at 00:51

Ke Li

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score 14 · Answer 3 · answered Mar 13 '19 at 15:35

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

score 14 · Answer 4 · edited Nov 21 '21 at 15:15

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Here is a cleaner way to show them (technically without symbolic links). This includes python2 and python3 installs:

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).

edited Nov 21 '21 at 15:15

ejkitchen

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answered Aug 13 '19 at 21:04

danbros

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score 7 · Accepted Answer · answered May 26 '15 at 18:31

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Use,

yum list installed

command to find the packages you installed.

answered May 26 '15 at 18:31

lpsandaruwan

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It doesn't give the list of python installed in the system. SO want python versions, not the list of packages. The @gabriel answer is good according to me. You can also use "whereis python" . it also gives the list of python on my centos and Mac system. – Arayan Singh Dec 12 '18 at 12:26
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In that case you can do `yum list installed | grep python` – lpsandaruwan Dec 13 '18 at 13:03
Bro already has done. Now it is showing list python packages NOT list of python versions – Arayan Singh Dec 13 '18 at 13:19

score 4 · Answer 6 · answered May 26 '15 at 18:15

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).

score 4 · Answer 7 · edited Sep 30 '19 at 18:45

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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.

edited Sep 30 '19 at 18:45

Nikaido

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answered Sep 30 '19 at 17:19

Alan O'Meara

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This assumes that the user knows they have python2.x and python3.x. What if they have anaconda and want to see those versions? This isn't general enough be be helpful. – Otherness Apr 12 '20 at 01:40

score 3 · Answer 8 · answered Sep 09 '19 at 03:39

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.

score 1 · Answer 9 · answered Oct 11 '21 at 22:34

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ls -l /usr/bin/python* & ls -l /usr/local/bin/python*

answered Oct 11 '21 at 22:34

george mano

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score 0 · Answer 10 · answered Dec 13 '20 at 13:16

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compgen -c python | grep -P '^python\d'

This lists some other python things too, But hey, You can identify all python versions among them.

answered Dec 13 '20 at 13:16

Appaji Chintimi

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score 0 · Answer 11 · answered Aug 19 '21 at 09:34

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Sift through the output of this script.

sudo find / -name 'python*' -type f  -exec du -h {}  + | sort -r -h ~/Documents/python_locations.txt

answered Aug 19 '21 at 09:34

tsm

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score 0 · Answer 12 · answered Nov 28 '21 at 13:55

I would add to @nurealam siddiq answer,

python --version // it shows your default Python installed version.

python2 --version // to check which version of python2 is installed 

python3 --version //to check which version of python3 is installed 

python3.X --version // to further check which python3.X is installed

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

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