Can I dynamically convert an instance of one class to another?

Question

I have a class that describe chess pieces. I make for all type piece in the Board a class for example Pawn, Queen, keen, etc... I have a trouble in Pawn class I want to conv

Answer 1

One way to solve this is to have a generic Piece class and another Strategy or Characteristics class. The piece provides generic interface common to all pieces (like move_to, or something) and Strategy decides if it's possible and how to execute the command. When you want to change a pawn to a queen, you change the strategy of the piece.

Edit: In your case it might not even be necessary to make it that complicated. You could have something like this:

class Piece:
    def __init__(self, movefunc):
        self.move = movefunc

def move_pawn(inst, unit=1):
    pass

pawn = Piece(move_pawn)