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math_domain.py

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# Tests domain errors in math functions

try:

import math

except ImportError:

print("SKIP")

raise SystemExit

inf = float("inf")

nan = float("nan")

# single argument functions

for name, f in (

("fabs", math.fabs),

("ceil", math.ceil),

("floor", math.floor),

("trunc", math.trunc),

("sqrt", math.sqrt),

("exp", math.exp),

("log", math.log),

("sin", math.sin),

("cos", math.cos),

("tan", math.tan),

("asin", math.asin),

("acos", math.acos),

("atan", math.atan),

("ldexp", lambda x: math.ldexp(x, 0)),

("radians", math.radians),

("degrees", math.degrees),

):

for x in (0, 1, 1.12, -1, -1.12, inf, -inf, nan):

try:

ans = "%.4f" % f(x)

except ValueError:

ans = "ValueError"

except OverflowError:

ans = "OverflowError"

print("%s(%.4f) = %s" % (name, x, ans))

# double argument functions

for name, f in (

("pow", math.pow),

("log", math.log),

("fmod", math.fmod),

("atan2", math.atan2),

("copysign", math.copysign),

):

for x in (

(0, 0),

(0, 2),

(0, -1),

(1, 0),

(1.2, 0),

(-1, 0),

(-1, 2),

(-1, 2.3),

(0, inf),

(0.5, inf),

(0.5, -inf),

(0.9, inf),

(0.9, -inf),

(1.2, inf),

(1.2, -inf),

(-0.5, inf),

(-0.5, -inf),

(-0.9, inf),

(-0.9, -inf),

(-1.2, inf),

(-1.2, -inf),

(inf, 0),

(inf, 1.2),

(inf, -1.2),

(inf, inf),

(inf, -inf),

(-inf, inf),

(-inf, -inf),

(0, nan),

(nan, 0),

(1, nan),

(nan, 1),

(inf, nan),

(nan, inf),

(nan, nan),

):

try:

ans = "%.4f" % f(*x)

except ValueError:

ans = "ValueError"

except ZeroDivisionError:

ans = "ZeroDivisionError"

print("%s(%.4f, %.4f) = %s" % (name, x[0], x[1], ans))