Migration to python3.8+

[ranaaditya]

Description

This PR is for the Migration of the project from python 2.7 to python 3.8+

Fixes # (issue)

Type of change

• Migrate the version of python so that new contributors can contribute hassle freely.

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules
• I have added all the three reviewers: @vinitshahdeo, @Kashish121 & @ishika1727

[welcome]

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PS: Please add @vinitshahdeo / @Kashish121 / @ishika1727 as a reviewer if you haven't added.

[ranaaditya]

Hi @vinitshahdeo please change the labels for this PR !

[Kashish121]

Not sure if this line would not throw error while running.
It should be
exc = getattr(builtins, "IOError", "FileNotFoundError")
instead of
exc = getattr(__builtins__, "IOError", "FileNotFoundError"),
I suppose.

Reference.

@ranaaditya does this file execute normally with __builtins__ ?

[ranaaditya]

Yeah, it was working fine in my local.

[Kashish121]

It's good to go then.

[ranaaditya]

@vinitshahdeo can you please review this PR and merge if possible ?

[ranaaditya]

@vinitshahdeo can you please review this PR and merge if possible ?

@Kashish121 whats the status about this PR ?