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py/modmath: Check for zero division in log with 2 args.

This commit is contained in:
Damien George 2017-07-04 02:15:11 +10:00
parent 9ed5e80eea
commit 6b8b56f859
2 changed files with 5 additions and 3 deletions
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2
py/modmath.c
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@ -168,6 +168,8 @@ STATIC mp_obj_t mp_math_log(size_t n_args, const mp_obj_t *args) {
mp_float_t base = mp_obj_get_float(args[1]);
if (base <= (mp_float_t)0.0) {
math_error();
} else if (base == (mp_float_t)1.0) {
mp_raise_msg(&mp_type_ZeroDivisionError, "division by zero");
}
return mp_obj_new_float(l / MICROPY_FLOAT_C_FUN(log)(base));
}

6
tests/float/math_fun.py
View File

@ -51,7 +51,7 @@ binary_functions = [('copysign', copysign, [(23., 42.), (-23., 42.), (23., -42.)
('atan2', atan2, ((1., 0.), (0., 1.), (2., 0.5), (-3., 5.), (-3., -4.),)),
('fmod', fmod, ((1., 1.), (0., 1.), (2., 0.5), (-3., 5.), (-3., -4.),)),
('ldexp', ldexp, ((1., 0), (0., 1), (2., 2), (3., -2), (-3., -4),)),
('log', log, ((2., 2.), (3., 2.), (4., 5.), (0., 1.), (1., 0.), (-1., 1.), (1., -1.))),
('log', log, ((2., 2.), (3., 2.), (4., 5.), (0., 1.), (1., 0.), (-1., 1.), (1., -1.), (2., 1.))),
]
for function_name, function, test_vals in binary_functions:
@ -59,5 +59,5 @@ for function_name, function, test_vals in binary_functions:
for value1, value2 in test_vals:
try:
print("{:.5g}".format(function(value1, value2)))
except ValueError as e:
print(str(e))
except (ValueError, ZeroDivisionError) as e:
print(type(e))