Update rock_paper_scissors.py

[brauliobolano]

Hi. I loved your video. I just want to contribute. I'm a freeCodeCamp student. created a dictionary choices just to map the user input ('r', 'p', 's' ) to the full word ( 'rock', 'paper', 'scissors') for better readability.

Also. I used the lower( ) method to convert it to lowercase. so, this way, the user can input either uppercase or lowercase characters without causing any issues.

And I simplified the condition for checking the winner by directly comparing the choices instead of using a separate function is_win. I think looks nice.

[brauliobolano]

Changes made :)

Created a dictionary choices to map user input ('r', 'p', 's') to the corresponding full word ('rock', 'paper', 'scissors') for better readability in the result messages.
Used the lower() method on the user input to convert it to lowercase. This way, the user can input either uppercase or lowercase characters without causing any issues.
Simplified the condition for checking the winner by directly comparing the choices instead of using a separate function is_win.
With these changes, the code should still function the same way as before but is now a bit more concise and easier to read.