Many methods exist within Python to create a tuple. Some are intuitive while others behave in strange ways. While type checking can help, complications abound.

Iterators as function inputs in Python can cause complex errors, due to storing references, differences between iterators and iterables, and other subtleties.

Using in for memberships in Python for iterables can behave differently. A list, dict, or iterator behave differently and type checkers may not find errors.