Installation of Python 2.7.x

[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).