Hi, nice article. Thank you.

Just wanted to add that your example is more suited for a class oriented programming language like Java. For python there are more straightforward ways to achieve the "visitor" effect.

One example would be to use singledispatch:

```python

from functools import singledispatch

@singledispatch

def visit(artwork: Artwork):

print(f"Visting {artwork.title}")

@visit.register

def visit_painting(artwork: Painting):

print(f"Protecting {artwork.title} by {artwork.artist}")

@visit.register

def visit_sculpture(artwork: Sculpture):

print(f"Cleaning {artwork.title} by {artwork.artist}")

@visit.register

def visit_instalation(artwork: Installation):

print(f"Maintaining {artwork.title} by {artwork.artist}")

for artwork in self.artworks:

visit(artwork)

```

Or if you don't want to use singledispatch, you can just have a simple dict with the type of each artwork subclass as key and a coresponding visit function as value.

Thank you again!