refactor+styling: Fix imports and PEP8 compliance

[vipul-sharma20]

Hi,

There were few redundant imports and few code segments where PEP8 linters were not happy.

Fixed changes below:

• Remove redundant imports
• Fix import order: standard library > 3rd party > current project
• Import specific Class/functions (* doesn't say much)
• PEP8 compliance: fix column width and new lines

[AdiChat]

Looks good 👍

Hope you are enjoying your journey with OpenGenus