Keys in dictionaries. A Python dictionary key can be nearly any Python object. I say “nearly” because the object in question must be hashable, meaning that it must have a hash value (the ...

Functions that return multiple values are hard to name clearly. ... (like Python) where multiple return values from one function can be used as multiple input parameters to another.

Python, for all its power and popularity, has long lacked a form of flow control found in other languages—a way to take a value and match it elegantly against one of a number of possible conditions.