Python 创建输入指定的类

我试图创建一个新对象，其中类由用户输入指定。 通过以上代码，我得到：

TypeError:“str”对象不可调用

如果输入与类名匹配，我可以通过几个if/elif语句创建所需类的对象来实现所需的结果，但这可能需要12行代码

谢谢

编辑： 以下是“丑陋”的方式：

                new_piece = input('What would you like to promote your Pawn to? ')
                if new_piece.capitalize() not in ['Queen','Bishop','Knight','Rook']:
                    print('Please choose one of: Queen, Bishop, Knight, or Rook')
                else:
                    if chosen_piece._white:
                        name = new_piece.lower() + 'w' + str(turn)
                    else:
                        name = new_piece.lower() + 'b' + str(turn)
                    for 
                    pieces[name] = new_piece.capitalize()(name, board[chosen_piece._position._name], chosen_piece._white)
                    board[chosen_piece._position._name].square_piece = pieces[name]

---

如果要基于名称实例化类，可以方便地使用字典作为映射器，其中名称是键，类是值。下面是一个有意简化的示例，以突出该技术

例如：

new_piece = input('What would you like to promote your Pawn to? ')
if new_piece.capitalize() not in ['Queen','Bishop','Knight','Rook']:
    print('Please choose one of: Queen, Bishop, Knight, or Rook')
else:
    if chosen_piece._white:
        name = new_piece.lower() + 'w' + str(turn)
    else:
        name = new_piece.lower() + 'b' + str(turn)
    if new_piece.capitalize() == 'Queen':
        pieces[name] = Queen(name, board[chosen_piece._position._name], chosen_piece._white)
        board[chosen_piece._position._name].square_piece = pieces[name]
        breaker = True
        break
    elif new_piece.capitalize() == 'Bishop':
        pieces[name] = Bishop(name, board[chosen_piece._position._name], chosen_piece._white)
        board[chosen_piece._position._name].square_piece = pieces[name]
        breaker = True
        break
    elif new_piece.capitalize() == 'Knight':
        pieces[name] = Knight(name, board[chosen_piece._position._name], chosen_piece._white)
        board[chosen_piece._position._name].square_piece = pieces[name]
        breaker = True
        break
    elif new_piece.capitalize() == 'Rook':
        pieces[name] = Rook(name, board[chosen_piece._position._name], chosen_piece._white)
        board[chosen_piece._position._name].square_piece = pieces[name]
        breaker = True
        break

---

这就是全部密码吗？因为代码中甚至有语法错误，大概有400行，所以我只需要输入必要的位。你以前创建过一个名为str的变量吗？现在我可以看到了。

class Queen:
    def __init__(self):
        print("I'm a Queen!")
class King:
    def __init__(self):
        print("I'm a King!")
class Bishop:
    def __init__(self):
        print("I'm a Bishop!")

chess_class_map = {
    "Queen": Queen,
    "King": King,
    "Bishop": Bishop,
}

piece_name = input("Enter chess piece to make: ")

piece_class = chess_class_map.get(piece_name.capitalize())
if piece_class:
    piece = piece_class()
else:
    print(f"Unable to make chess piece: {piece_name}")