mirror of https://github.com/python/cpython
197 lines
7.7 KiB
Python
Executable File
197 lines
7.7 KiB
Python
Executable File
from test.test_support import run_unittest
|
|
import unittest
|
|
import cmath, math
|
|
|
|
class CMathTests(unittest.TestCase):
|
|
# list of all functions in cmath
|
|
test_functions = [getattr(cmath, fname) for fname in [
|
|
'acos', 'acosh', 'asin', 'asinh', 'atan', 'atanh',
|
|
'cos', 'cosh', 'exp', 'log', 'log10', 'sin', 'sinh',
|
|
'sqrt', 'tan', 'tanh']]
|
|
# test first and second arguments independently for 2-argument log
|
|
test_functions.append(lambda x : cmath.log(x, 1729. + 0j))
|
|
test_functions.append(lambda x : cmath.log(14.-27j, x))
|
|
|
|
def cAssertAlmostEqual(self, a, b, rel_eps = 1e-10, abs_eps = 1e-100):
|
|
"""Check that two complex numbers are almost equal."""
|
|
# the two complex numbers are considered almost equal if
|
|
# either the relative error is <= rel_eps or the absolute error
|
|
# is tiny, <= abs_eps.
|
|
if a == b == 0:
|
|
return
|
|
absolute_error = abs(a-b)
|
|
relative_error = absolute_error/max(abs(a), abs(b))
|
|
if relative_error > rel_eps and absolute_error > abs_eps:
|
|
self.fail("%s and %s are not almost equal" % (a, b))
|
|
|
|
def test_constants(self):
|
|
e_expected = 2.71828182845904523536
|
|
pi_expected = 3.14159265358979323846
|
|
self.assertAlmostEqual(cmath.pi, pi_expected, 9,
|
|
"cmath.pi is %s; should be %s" % (cmath.pi, pi_expected))
|
|
self.assertAlmostEqual(cmath.e, e_expected, 9,
|
|
"cmath.e is %s; should be %s" % (cmath.e, e_expected))
|
|
|
|
def test_user_object(self):
|
|
# Test automatic calling of __complex__ and __float__ by cmath
|
|
# functions
|
|
|
|
# some random values to use as test values; we avoid values
|
|
# for which any of the functions in cmath is undefined
|
|
# (i.e. 0., 1., -1., 1j, -1j) or would cause overflow
|
|
cx_arg = 4.419414439 + 1.497100113j
|
|
flt_arg = -6.131677725
|
|
|
|
# a variety of non-complex numbers, used to check that
|
|
# non-complex return values from __complex__ give an error
|
|
non_complexes = ["not complex", 1, 5, 2., None,
|
|
object(), NotImplemented]
|
|
|
|
# Now we introduce a variety of classes whose instances might
|
|
# end up being passed to the cmath functions
|
|
|
|
# usual case: new-style class implementing __complex__
|
|
class MyComplex(object):
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __complex__(self):
|
|
return self.value
|
|
|
|
# old-style class implementing __complex__
|
|
class MyComplexOS:
|
|
def __init__(self, value):
|
|
self.value = value
|
|
def __complex__(self):
|
|
return self.value
|
|
|
|
# classes for which __complex__ raises an exception
|
|
class SomeException(Exception):
|
|
pass
|
|
class MyComplexException(object):
|
|
def __complex__(self):
|
|
raise SomeException
|
|
class MyComplexExceptionOS:
|
|
def __complex__(self):
|
|
raise SomeException
|
|
|
|
# some classes not providing __float__ or __complex__
|
|
class NeitherComplexNorFloat(object):
|
|
pass
|
|
class NeitherComplexNorFloatOS:
|
|
pass
|
|
class MyInt(object):
|
|
def __int__(self): return 2
|
|
def __long__(self): return 2
|
|
def __index__(self): return 2
|
|
class MyIntOS:
|
|
def __int__(self): return 2
|
|
def __long__(self): return 2
|
|
def __index__(self): return 2
|
|
|
|
# other possible combinations of __float__ and __complex__
|
|
# that should work
|
|
class FloatAndComplex(object):
|
|
def __float__(self):
|
|
return flt_arg
|
|
def __complex__(self):
|
|
return cx_arg
|
|
class FloatAndComplexOS:
|
|
def __float__(self):
|
|
return flt_arg
|
|
def __complex__(self):
|
|
return cx_arg
|
|
class JustFloat(object):
|
|
def __float__(self):
|
|
return flt_arg
|
|
class JustFloatOS:
|
|
def __float__(self):
|
|
return flt_arg
|
|
|
|
for f in self.test_functions:
|
|
# usual usage
|
|
self.cAssertAlmostEqual(f(MyComplex(cx_arg)), f(cx_arg))
|
|
self.cAssertAlmostEqual(f(MyComplexOS(cx_arg)), f(cx_arg))
|
|
# other combinations of __float__ and __complex__
|
|
self.cAssertAlmostEqual(f(FloatAndComplex()), f(cx_arg))
|
|
self.cAssertAlmostEqual(f(FloatAndComplexOS()), f(cx_arg))
|
|
self.cAssertAlmostEqual(f(JustFloat()), f(flt_arg))
|
|
self.cAssertAlmostEqual(f(JustFloatOS()), f(flt_arg))
|
|
# TypeError should be raised for classes not providing
|
|
# either __complex__ or __float__, even if they provide
|
|
# __int__, __long__ or __index__. An old-style class
|
|
# currently raises AttributeError instead of a TypeError;
|
|
# this could be considered a bug.
|
|
self.assertRaises(TypeError, f, NeitherComplexNorFloat())
|
|
self.assertRaises(TypeError, f, MyInt())
|
|
self.assertRaises(Exception, f, NeitherComplexNorFloatOS())
|
|
self.assertRaises(Exception, f, MyIntOS())
|
|
# non-complex return value from __complex__ -> TypeError
|
|
for bad_complex in non_complexes:
|
|
self.assertRaises(TypeError, f, MyComplex(bad_complex))
|
|
self.assertRaises(TypeError, f, MyComplexOS(bad_complex))
|
|
# exceptions in __complex__ should be propagated correctly
|
|
self.assertRaises(SomeException, f, MyComplexException())
|
|
self.assertRaises(SomeException, f, MyComplexExceptionOS())
|
|
|
|
def test_input_type(self):
|
|
# ints and longs should be acceptable inputs to all cmath
|
|
# functions, by virtue of providing a __float__ method
|
|
for f in self.test_functions:
|
|
for arg in [2, 2.]:
|
|
self.cAssertAlmostEqual(f(arg), f(arg.__float__()))
|
|
|
|
# but strings should give a TypeError
|
|
for f in self.test_functions:
|
|
for arg in ["a", "long_string", "0", "1j", ""]:
|
|
self.assertRaises(TypeError, f, arg)
|
|
|
|
def test_cmath_matches_math(self):
|
|
# check that corresponding cmath and math functions are equal
|
|
# for floats in the appropriate range
|
|
|
|
# test_values in (0, 1)
|
|
test_values = [0.01, 0.1, 0.2, 0.5, 0.9, 0.99]
|
|
|
|
# test_values for functions defined on [-1., 1.]
|
|
unit_interval = test_values + [-x for x in test_values] + \
|
|
[0., 1., -1.]
|
|
|
|
# test_values for log, log10, sqrt
|
|
positive = test_values + [1.] + [1./x for x in test_values]
|
|
nonnegative = [0.] + positive
|
|
|
|
# test_values for functions defined on the whole real line
|
|
real_line = [0.] + positive + [-x for x in positive]
|
|
|
|
test_functions = {
|
|
'acos' : unit_interval,
|
|
'asin' : unit_interval,
|
|
'atan' : real_line,
|
|
'cos' : real_line,
|
|
'cosh' : real_line,
|
|
'exp' : real_line,
|
|
'log' : positive,
|
|
'log10' : positive,
|
|
'sin' : real_line,
|
|
'sinh' : real_line,
|
|
'sqrt' : nonnegative,
|
|
'tan' : real_line,
|
|
'tanh' : real_line}
|
|
|
|
for fn, values in test_functions.items():
|
|
float_fn = getattr(math, fn)
|
|
complex_fn = getattr(cmath, fn)
|
|
for v in values:
|
|
self.cAssertAlmostEqual(float_fn(v), complex_fn(v))
|
|
|
|
# test two-argument version of log with various bases
|
|
for base in [0.5, 2., 10.]:
|
|
for v in positive:
|
|
self.cAssertAlmostEqual(cmath.log(v, base), math.log(v, base))
|
|
|
|
def test_main():
|
|
run_unittest(CMathTests)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|