Installation of Python 2.7.x

[akshaynimkar]

Hello All,
I want to install Python 2.7.x on Linux as AWS Redshift is compatible with this version.

The current Linux already have one version of Python installed (2.6.6).
Linux version is GNU/Linux.

Please let me know whether we can upgrade the existing(default) version from 2.6.6 to 2.7.x.
If not then how can we install 2.7.x version on the same machine without breaking default installed Python version.

Thanks,
Akshay

[gontajones]

Did you try sudo apt-get install python2.7?

[akshaynimkar]

It seems it will upgrade the by default version of Python to 2.7 installed in Linux.
And it is not advisable.
So please let me know whether above command will install 2.7 without upgrading the default Python version on Linux.

[gontajones]

What is the output of:

which python
Or
which python2

And then, use ls on that output folder:
ls -la /FOLDER/ | grep python


For now...
I created a docker image with ubuntu and added the ppa:
sudo add-apt-repository ppa:deadsnakes
And with it I installed 2.6 and then 2.7 and 3.6:
sudo apt-get install python2.6 python2.7 python3.6

Now I got all these python versions:

Output:
root@e2d21deb2627:/# python
python2.6   python2.7   python3     python3.6   python3.6m  python3m    
root@e2d21deb2627:/# python2.6
Python 2.6.9 (default, Apr 29 2018, 12:56:59) 
[GCC 7.3.0] on linux4
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
root@e2d21deb2627:/# python2.7
Python 2.7.15rc1 (default, Apr 15 2018, 21:51:34) 
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
root@e2d21deb2627:/# python3  
Python 3.6.5 (default, Apr  1 2018, 05:46:30) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> exit()
root@e2d21deb2627:/#

[akshaynimkar]

Hello,
I need python version 2.7.x to be installed in Linux as it is compatible with Amazon Redshift.
So could you please provide me step by step guide how I can install the python version without disturbing default version and use it further.
Thanks.

[gontajones]

Ok, but we need more info about your system.

Post the outputs of these commands:

Which OS is running there?
uname -a

Which python?
which python

Which python libraries are installed?
find /usr/lib/ -name "libpython*"

[akshaynimkar]

uname -a
Linux .x86_64 #1 SMP Thu Apr 26 04:27:41 EDT 2018 x86_64 x86_64 x86_64 GNU/Linux

which python
/usr/bin/python


find /usr/lib/ -name "libpython*"
No Result

[gontajones]

One last test...

ls -la /usr/bin/python*

And I made some tests here and I'm pretty sure that if you use:

sudo apt-get install python2.7

The system will keep the python2.6 and get the new file for the python2.7.

[akshaynimkar]

Thanks for the kind support!
Below is the output of ls -la /usr/bin/python*

/usr/bin/python
/usr/bin/python2 -> python
/usr/bin/python2.6

Please help me with below additional points.
1. How do I validate that Linux default version is not affected due to installation on 2.7.x.
2. How to view two Python versions are installed in parallel.
3. I need to install other software on Python 2.7.x, so how would I choose Python 2.7.x while installation and validate it after installation.

Thanks,
Akshay

[gontajones]

1. How do I validate that Linux default version is not affected due to installation on 2.7.x.

The version 2.7 of python will be installed besides the other installations as /usr/bin/python2.7
And you'll have to use python2.7 my_script.py to run your 2.7 scripts.

2. How to view two Python versions are installed in parallel.

You will have to check for the interpreter in the source folders in your PATH.

3. I need to install other software on Python 2.7.x, so how would I choose Python 2.7.x while installation and validate it after installation.

Just use the corresponding pip(2.7) to install the package/modules for your 2.7 scripts (applications).