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並前往https://scipython.com/book2/chapter-4-the-core-python-language-ii/examples/a-2d-vector-class/

A 2D vector class - Learning Scientific Programming with Python

import math class Vector2D: """A two-dimensional vector with Cartesian coordinates.""" def __init__(self, x, y): self.x, self.y = x, y def __str__(self): ...

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