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pip: requirements vs. constraints (intermediate) anthony explains #367

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how does python's module `__getattr__` actually work?

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solve this by narrowing to a Literal

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Reuven Lerner: Avoiding memory leaks with "weakref"

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what are python wheels? (intermediate - advanced) anthony explains #371

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python descriptors! (advanced) anthony explains #519

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Python. К вершинам мастерства. Изучаем продвинутый Python

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