def test_complex():
# given that complex numbers are an unordered field
# the arithmetic mean of complex numbers is meaningless
pytest.skip('Complex numbers')
num_list = [2 + 3j, 3 + 4j, -32 - 2j]
obs = mean(num_list)
exp = NotImplemented
assert obs == exp
def test_mean_wrong_type():
with pytest.raises(TypeError):
mean('not a list')
def test_long():
big = 100000000
obs = mean(range(1, big))
exp = big / 2.0
assert obs == exp
def test_empty():
with pytest.raises(ZeroDivisionError):
mean([])
def test_double():
# This one will fail in Python 2
num_list = [1, 2, 3, 4]
obs = mean(num_list)
exp = 2.5
assert obs == exp
def test_zero():
num_list = [0, 2, 4, 6]
obs = mean(num_list)
exp = 3
assert obs == exp
def test_ints(num_list_3):
# num_list_3 = [1, 2, 3, 4, 5]
obs = mean(num_list_3)
exp = 3
assert obs == exp
def test_many(num_list, expected_mean):
# assert mean(num_list) == expected_mean
assert np.isclose(mean(num_list), expected_mean, 1e-3)