79 lines
1.9 KiB
Python
79 lines
1.9 KiB
Python
from sympy.core.singleton import S
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from sympy.strategies.rl import (
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rm_id, glom, flatten, unpack, sort, distribute, subs, rebuild)
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from sympy.core.basic import Basic
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from sympy.core.add import Add
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from sympy.core.mul import Mul
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from sympy.core.symbol import symbols
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from sympy.abc import x
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def test_rm_id():
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rmzeros = rm_id(lambda x: x == 0)
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assert rmzeros(Basic(S(0), S(1))) == Basic(S(1))
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assert rmzeros(Basic(S(0), S(0))) == Basic(S(0))
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assert rmzeros(Basic(S(2), S(1))) == Basic(S(2), S(1))
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def test_glom():
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def key(x):
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return x.as_coeff_Mul()[1]
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def count(x):
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return x.as_coeff_Mul()[0]
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def newargs(cnt, arg):
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return cnt * arg
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rl = glom(key, count, newargs)
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result = rl(Add(x, -x, 3 * x, 2, 3, evaluate=False))
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expected = Add(3 * x, 5)
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assert set(result.args) == set(expected.args)
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def test_flatten():
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assert flatten(Basic(S(1), S(2), Basic(S(3), S(4)))) == \
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Basic(S(1), S(2), S(3), S(4))
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def test_unpack():
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assert unpack(Basic(S(2))) == 2
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assert unpack(Basic(S(2), S(3))) == Basic(S(2), S(3))
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def test_sort():
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assert sort(str)(Basic(S(3), S(1), S(2))) == Basic(S(1), S(2), S(3))
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def test_distribute():
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class T1(Basic):
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pass
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class T2(Basic):
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pass
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distribute_t12 = distribute(T1, T2)
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assert distribute_t12(T1(S(1), S(2), T2(S(3), S(4)), S(5))) == \
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T2(T1(S(1), S(2), S(3), S(5)), T1(S(1), S(2), S(4), S(5)))
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assert distribute_t12(T1(S(1), S(2), S(3))) == T1(S(1), S(2), S(3))
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def test_distribute_add_mul():
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x, y = symbols('x, y')
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expr = Mul(2, Add(x, y), evaluate=False)
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expected = Add(Mul(2, x), Mul(2, y))
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distribute_mul = distribute(Mul, Add)
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assert distribute_mul(expr) == expected
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def test_subs():
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rl = subs(1, 2)
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assert rl(1) == 2
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assert rl(3) == 3
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def test_rebuild():
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expr = Basic.__new__(Add, S(1), S(2))
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assert rebuild(expr) == 3
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