Python objects are “reference counted ... and Python comes with a large number of standard support modules. Some are built in to the core of the interpreter, while others are external ...

Among the data structures built into Python ... Each key is associated with a value, which can be any Python object. You use a key to obtain its related values, and the lookup time for each ...

Every object in Python has a reference count that tracks how many times other objects refer to it, including built-in objects like None. PEP 683 allows objects to be treated as “immortal,” so ...