def test_dict_set():
a, b = map(Wild, 'ab')
f = 3 * cos(4 * x)
r = f.match(a * cos(b * x))
assert r == {a: 3, b: 4}
e = a / b * sin(b * x)
assert e.subs(r) == r[a] / r[b] * sin(r[b] * x)
assert e.subs(r) == 3 * sin(4 * x) / 4
s = set(r.items())
assert e.subs(s) == r[a] / r[b] * sin(r[b] * x)
assert e.subs(s) == 3 * sin(4 * x) / 4
assert e.subs(r) == r[a] / r[b] * sin(r[b] * x)
assert e.subs(r) == 3 * sin(4 * x) / 4
assert x.subs(Dict((x, 1))) == 1
def test_dict_set():
a, b, c = map(Wild, 'abc')
f = 3*cos(4*x)
r = f.match(a*cos(b*x))
assert r == {a: 3, b: 4}
e = a/b*sin(b*x)
assert e.subs(r) == r[a]/r[b]*sin(r[b]*x)
assert e.subs(r) == 3*sin(4*x) / 4
s = set(r.items())
assert e.subs(s) == r[a]/r[b]*sin(r[b]*x)
assert e.subs(s) == 3*sin(4*x) / 4
assert e.subs(r) == r[a]/r[b]*sin(r[b]*x)
assert e.subs(r) == 3*sin(4*x) / 4
assert x.subs(Dict((x, 1))) == 1
def test_subs_iter():
assert x.subs(reversed([[x, y]])) == y
it = iter([[x, y]])
assert x.subs(it) == y
assert x.subs(Tuple((x, y))) == y
def test_subs_iter():
assert x.subs(reversed([[x, y]])) == y
it = iter([[x, y]])
assert x.subs(it) == y
assert x.subs(Tuple((x, y))) == y