For doing "duck-typing" formally, you need Interfaces or Protocols, rather than checking from a shortlist of allowed types. Here's a blog post [1] from this di

For doing "duck-typing" formally, you need Interfaces or Protocols, rather than checking from a shortlist of allowed types. Here's a blog post [1] from this discussion on Django 3.2 [2] 10 days ago. [1] https://glyph.twistedmatrix.com/2021/03/interfaces-and-protocols.html https://glyph.twistedmatrix.com/2021/03/interfaces-and-proto... [2] https://news.ycombinator.com/item?id=26710013 https://news.ycombinator.com/item?id=26710013