| Class | Description | 
|---|---|
| Collections | Collections - This module adds the ability to use high performance data 
               structures | 
| PyDefaultDict | PyDefaultDict - This is a subclass of the builtin dict(PyDictionary) class. | 
| PyDefaultDictDerived | |
| PyDeque | PyDeque - This class implements the functionalities of Deque data structure. | 
| PyDequeDerived |