Python If Statement in function not running despite condition being met

I am currently attempting to program basic positional movement for a text adventure of mine and no matter what I do the 0.1 position if statement code never runs. I have tried editing the position variable before it is passed in as well to 0.1 but nothing occurs when the function is ran. The position 0.0 code runs fine but doesn't return the value of 0.1, instead returning 'NONE'. (I found this out via a print statement within the function and all it gave was 'NONE') Is there something I'm missing that's super obvious as I feel like there is. The bare minimum code to reproduce the error is this:

def main():  
    print('Time to test out movement.')
    Position = 0.0
    while Position != 9.9:
        Position = Movement(Position)
        
    
    print('Test concluded.')

def Movement(Position):
    if Position == 0.0:
        print('You have entered this old and decrepid dungeon in hopes of finding some kind of riches.')
        print('What would you like to do?')
        print('1-Move north to room 0.1')
        PChoice = int(input())
        if PChoice == 1:
            return 0.1
        
    if Position == 0.1:
        print('Movement successful.')
        

if __name__ == '__main__': main()