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GeezerVison is showing github.com — python-patterns/patterns/structural/bridge.py at master · kamyu104/python-patterns Expand file tree/ Copy pathbridge.pyMore file actions 54 lines (39 loc) · 1.21 KB / Copy pathbridge.pyFile metadata and controls54 lines (39 loc) · 1.21 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 """ *References: http://en.wikibooks.org/wiki/Computer_Science_Design_Patterns/Bridge_Pattern#Python *TL;DR Decouples an abstraction from its implementation. """ # ConcreteImplementor 1/2 class DrawingAPI1: def draw_circle(self, x, y, radius): print(f"API1.circle at {x}:{y} radius {radius}") # ConcreteImplementor 2/2 class DrawingAPI2: def draw_circle(self, x, y, radius): print(f"API2.circle at {x}:{y} radius {radius}") # Refined Abstraction class CircleShape: def __init__(self, x, y, radius, drawing_api): self._x = x self._y = y self._radius = radius self._drawing_api = drawing_api # low-level i.e. Implementation specific def draw(self): self._drawing_api.draw_circle(self._x, self._y, self._radius) # high-level i.e. Abstraction specific def scale(self, pct): self._radius *= pct def main(): """ >>> shapes = (CircleShape(1, 2, 3, DrawingAPI1()), CircleShape(5, 7, 11, DrawingAPI2())) >>> for shape in shapes: ... shape.scale(2.5) ... shape.draw() API1.circle at 1:2 radius 7.5 API2.circle at 5:7 radius 27.5 """ if __name__ == "__main__": import doctest doctest.testmod() |
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