Fix - Linting errors and code refactor in setup.py

[ayeshashahzad1]

Describe the changes you've made

Fix the linting errors in setup.py and refactor the code.

Type of change

•⁠ ⁠[x] My code follows the code style of this project.
•⁠ ⁠[x] Code style update (formatting, local variables)

Describe if there is any unusual behaviour of your code(Write ⁠ NA ⁠ if there isn't)

NA

Checklist:

•⁠ ⁠[x] My code follows the code style of this project.
•⁠ ⁠[x] My code follows the style guidelines of this project.
•⁠ ⁠[x] I have performed a self-review of my own code.
•⁠ ⁠[x] I have commented my code, particularly in hard-to-understand areas.
•⁠ ⁠[x] I have made corresponding changes to the documentation.
•⁠ ⁠[x] My changes generate no new warnings.
•⁠ ⁠[ ] I have added tests that prove my fix is effective or that my feature works.
•⁠ ⁠[ ] New and existing unit tests pass locally with my changes.
•⁠ ⁠[ ] Any dependent changes have been merged and published in downstream modules.