Паттерн Proxy не сохраняет картинку

def main():
    pass
 
if __name__ == '__main__':
    main()
 
from functools import partial
from PIL import Image as ImagePil
 
class ImageBase:
    @classmethod
    def create(cls, width, height):
        return cls(width, height)
    def draw(self, x, y, color):
        raise NotImplementedError()
    def fill(self, color):
        raise NotImplementedError()
    def save(self, filename):
        raise NotImplementedError()
 
 
class Image(ImageBase):
    def init(self, width, height):
        self._img = ImagePil.new('RGB', (width, height), (0, 0, 0))
        self._pixels = self._img.load()
    def draw(self, x, y, color):
        print('Drawing a dot at (%d, %d) with color: %s' % (x, y, str(color)))
        self._pixels[x, y] = color
    def fill(self, color):
        print('Filling with color: %s' % str(color))
        self._img.paste(color, [0, 0, self._img.size[0], self._img.size[1]])
    def save(self, filename):
        print('Saving to %s' % filename)
        self._img.save(filename, 'PNG')
 
 
class ImageProxy(ImageBase):
    def init(self, *args, **kwargs):
        self._image = Image(*args, **kwargs)
        self.operations = []
    def draw(self, *args):
        func = partial(self._image.draw, *args)
        self.operations.append(func)
 
    def fill(self, *args):
        func = partial(self._image.fill, *args)
        self.operations.append(func)
    def save(self, filename):
        map(lambda f: f(), self.operations)
        self._image.save(filename)
 
        img = ImageProxy(20, 20)
        img.fill((127, 127, 127))
        img.draw(0, 0, (0, 255, 0))
        img.draw(0, 1, (0, 255, 0))
        img.draw(1, 0, (0, 255, 0))
        img.draw(1, 1, (0, 255, 0))
        img.save('C:\123\image.png')