1# test math.isclose (appeared in Python 3.5)
2
3try:
4    from math import isclose
5except ImportError:
6    print("SKIP")
7    raise SystemExit
8
9
10def test(a, b, **kwargs):
11    print(isclose(a, b, **kwargs))
12
13
14def test_combinations(a, b, **kwargs):
15    test(a, a, **kwargs)
16    test(a, b, **kwargs)
17    test(b, a, **kwargs)
18    test(b, b, **kwargs)
19
20
21# Special numbers
22test_combinations(float("nan"), 1)
23test_combinations(float("inf"), 1)
24test_combinations(float("-inf"), 1)
25
26# Equality
27test(1.0, 1.0, rel_tol=0.0, abs_tol=0.0)
28test(2.35e-100, 2.35e-100, rel_tol=0.0, abs_tol=0.0)
29test(2.1234e100, 2.1234e100, rel_tol=0.0, abs_tol=0.0)
30
31# Relative tolerance
32test(1000.0, 1001.0, rel_tol=1e-3)
33test(1000.0, 1001.0, rel_tol=1e-4)
34test(1000, 1001, rel_tol=1e-3)
35test(1000, 1001, rel_tol=1e-4)
36test_combinations(0, 1, rel_tol=1.0)
37
38# Absolute tolerance
39test(0.0, 1e-10, abs_tol=1e-10, rel_tol=0.1)
40test(0.0, 1e-10, abs_tol=0.0, rel_tol=0.1)
41
42# Bad parameters
43try:
44    isclose(0, 0, abs_tol=-1)
45except ValueError:
46    print("ValueError")
47try:
48    isclose(0, 0, rel_tol=-1)
49except ValueError:
50    print("ValueError")
51