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# test math.isclose (appeared in Python 3.5)

try:

from math import isclose

except ImportError:

print("SKIP")

raise SystemExit

def test(a, b, **kwargs):

print(isclose(a, b, **kwargs))

def test_combinations(a, b, **kwargs):

test(a, a, **kwargs)

test(a, b, **kwargs)

test(b, a, **kwargs)

test(b, b, **kwargs)

# Special numbers

test_combinations(float("nan"), 1)

test_combinations(float("inf"), 1)

test_combinations(float("-inf"), 1)

# Equality

test(1.0, 1.0, rel_tol=0.0, abs_tol=0.0)

test(2.35e-100, 2.35e-100, rel_tol=0.0, abs_tol=0.0)

test(2.1234e100, 2.1234e100, rel_tol=0.0, abs_tol=0.0)

# Relative tolerance

test(1000.0, 1001.0, rel_tol=1e-3)

test(1000.0, 1001.0, rel_tol=1e-4)

test(1000, 1001, rel_tol=1e-3)

test(1000, 1001, rel_tol=1e-4)

test_combinations(0, 1, rel_tol=1.0)

# Absolute tolerance

test(0.0, 1e-10, abs_tol=1e-10, rel_tol=0.1)

test(0.0, 1e-10, abs_tol=0.0, rel_tol=0.1)

# Bad parameters

try:

isclose(0, 0, abs_tol=-1)

except ValueError:

print("ValueError")

try:

isclose(0, 0, rel_tol=-1)

except ValueError:

print("ValueError")