Add python snippet for calculating factorial

[SamratBarai]

Description

Type of Change

• ✨ New snippet
• 🛠 Improvement to an existing snippet
• 🐞 Bug fix
• 📖 Documentation update
• 🔧 Other (please describe):

Checklist

• I have tested my code and verified it works as expected.
• My code follows the style and contribution guidelines of this project.
• Comments are added where necessary for clarity.
• Documentation has been updated (if applicable).
• There are no new warnings or errors from my changes.

Related Issues

Closes #

Additional Context

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[majvax]

Thanks for your contribution! 👏

I appreciate you catching that error in our existing snippets - this kind of attention to detail really helps maintain quality.

However, regarding the factorial calculation snippets you've proposed: while well-implemented, they don't align with our current quicksnip scope. Factorial calculations are relatively simple operations that only require basic math knowledge and are straightforward to implement.

could you remove the factorial function so we can merge the rest ?