Initialisation du repository de Beta
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from sympy.core.symbol import symbols
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from sympy.codegen.pynodes import List
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def test_List():
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l = List(2, 3, 4)
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assert l == List(2, 3, 4)
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assert str(l) == "[2, 3, 4]"
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x, y, z = symbols('x y z')
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l = List(x**2,y**3,z**4)
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# contrary to python's built-in list, we can call e.g. "replace" on List.
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m = l.replace(lambda arg: arg.is_Pow and arg.exp>2, lambda p: p.base-p.exp)
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assert m == [x**2, y-3, z-4]
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