def test_std5():
obs = std([11.0, 11.0, 11.0, 11.0, 11.0, 11.0])
exp = 0.0
assert obs == exp
def test_std4():
obs = std([1.0, 2.0, 3.0, 4.0, 5.0])
exp = 1.41421
assert_allclose(obs, exp, atol=0.00001, rtol=0)
def test_std2():
obs = std([])
exp = 0.0
assert obs == exp
def test_std3():
obs = std([5.0])
exp = 0.0
assert obs == exp
def test_std1():
obs = std([0.0, 2.0])
exp = 1.0
assert obs == exp