def test__1031_subs():
t1, x1, y1, z1 = sp.symbols("t x y z")
q_syms = Qs([Q([t1, x1, y1, x1 * y1 * z1])])
q_z = q_syms.subs({t1: 1, x1: 2, y1: 3, z1: 4})
print("t x y xyz sub 1 2 3 4: ", q_z)
assert equals(q_z, Qs([Q([1, 2, 3, 24])]))
def test__1031_subs():
t, x, y, z = sp.symbols("t x y z")
q_sym = Qs([Q([t, x, y, x * y * z])])
q_z = q_sym.subs({t: 1, x: 2, y: 3, z: 4})
print("t x y xyz sub 1 2 3 4: ", q_z)
assert q_z.equals(Qs([Q([1, 2, 3, 24])]))
