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# Note that this function is already available in the math module as fsum(). def number_sum(n): if n == 0: return 0 else: return n + number_sum(n - 1)
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posted @ 2024-08-17 10:05
ZhangZhihuiAAA
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A structural design pattern proposes a way of composing objects to provide new functionality. • The adapter pattern The adapter pattern is a structura
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posted @ 2024-08-16 16:02
ZhangZhihuiAAA
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Creational design patterns deal with different aspects of object creation. Their goal is to provide better alternatives for situations where direct ob
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posted @ 2024-08-16 09:26
ZhangZhihuiAAA
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• Single responsibility principle (SRP) • Open-closed principle (OCP) It emphasizes that software entities, such as classes and modules, should be ope
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posted @ 2024-08-16 09:18
ZhangZhihuiAAA
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Introduced in Python 3.8 via the typing module, Protocols offer a more flexible approach than ABCs, known as structural duck typing, where an object i
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posted @ 2024-08-15 22:03
ZhangZhihuiAAA
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Encapsulate What Varies One of the most common challenges in software development is dealing with change. Requirements evolve, technologies advance, a
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posted @ 2024-08-15 21:40
ZhangZhihuiAAA
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A natural way to deal with uncertainty is to introduce probabilistic rules. In the simplest case, we can imagine an FSM-like device having no commands
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posted @ 2024-08-15 19:53
ZhangZhihuiAAA
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Finite state machines (FSMs) serve as a great example of an important theoretical construction that also turns out to be a useful tool for everyday pr
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posted @ 2024-08-13 21:23
ZhangZhihuiAAA
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A virtual ant lives on an infinite board, divided into square cells. Each cell can be either black or white. For starters, we can consider an empty (a
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posted @ 2024-08-13 16:16
ZhangZhihuiAAA
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>>> bugs = ["bug1", "bug2"] >>> sum(bugs, []) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: can only concatenate l
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posted @ 2024-08-11 19:52
ZhangZhihuiAAA
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