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Python provides a number of advanced constructs that can make the language more expressive, and in many cases more efficient. Python expresses “laziness” via iterators, sometimes defined by generator functions, which are a way of describing delayed computation and infinite data streams. Context managers are a means of surrounding blocks of code with reusable setup and teardown. Decorators allow you to express cross-cutting concerns for functions or classes that are given a general aspect, again with an emphasis on reusability.
