replaced exit() with sys.exit()

[aayu-s]

Description

The exit or quit functions don't exist at the top-level if python is started with the -S flag, and will raise an error. Use sys.exit() instead. exit() is used and will fail if the python is run with the -S option, where as sys.exit() is guaranteed to work, regardless of the interpreter options.

Fixes #1253

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)

• Checklist:

• [ ] My code follows the style guidelines(Clean Code) 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 created a helpful and easy to understand README.md

• [ ] I have made corresponding changes to the documentation

• [ ] My changes generate no new warnings

• [ ] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works

[ghost]

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[github-actions[bot]]

@aayu-s Hurray, your PR got merged 🥳. Thanks a bunch. Feel free to take another Issue.💖