def test_power_special_cases():
'''
Checks special cases of umath.pow().
'''
test_uncertainties.power_special_cases(umath.pow)
# We want the same behavior for numbers with uncertainties and for
# math.pow() at their nominal values:
positive = ufloat(0.3, 0.01)
negative = ufloat(-0.3, 0.01)
# http://stackoverflow.com/questions/10282674/difference-between-the-built-in-pow-and-math-pow-for-floats-in-python
try:
umath.pow(ufloat(0, 0.1), negative)
except (ValueError, OverflowError), err: # Python 2.6+ "as err"
err_type = type(err) # For Python 3: err is destroyed after except
def test_power_special_cases():
'''
Checks special cases of umath.pow().
'''
test_uncertainties.power_special_cases(umath.pow)
# We want the same behavior for numbers with uncertainties and for
# math.pow() at their nominal values:
positive = ufloat(0.3, 0.01)
negative = ufloat(-0.3, 0.01)
# http://stackoverflow.com/questions/10282674/difference-between-the-built-in-pow-and-math-pow-for-floats-in-python
try:
umath.pow(ufloat(0, 0.1), negative)
except (ValueError, OverflowError), err: # Python 2.6+ "as err"
err_class = err.__class__ # For Python 3: err is destroyed after except
def test_power_special_cases():
'''
Checks special cases of umath.pow().
'''
test_uncertainties.power_special_cases(umath.pow)
# We want the same behavior for numbers with uncertainties and for
# math.pow() at their nominal values:
positive = ufloat(0.3, 0.01)
negative = ufloat(-0.3, 0.01)
# http://stackoverflow.com/questions/10282674/difference-between-the-built-in-pow-and-math-pow-for-floats-in-python
try:
umath.pow(ufloat(0, 0.1), negative)
except (ValueError, OverflowError) as err:
err_class = err.__class__ # For Python 3: err is destroyed after except
else:
err_class = None
err_msg = 'A proper exception should have been raised'
# An exception must have occurred:
assert err_class == ValueError, err_msg
try:
result = umath.pow(negative, positive)
except ValueError:
# The reason why it should also fail in Python 3 is that the
# result of Python 3 is a complex number, which uncertainties
# does not handle (no uncertainties on complex numbers). In
# Python 2, this should always fail, since Python 2 does not
# know how to calculate it.
pass
else:
raise Exception('A proper exception should have been raised')
def test_power_special_cases():
'''
Checks special cases of umath_core.pow().
'''
test_uncertainties.power_special_cases(umath_core.pow)
# We want the same behavior for numbers with uncertainties and for
# math.pow() at their nominal values:
positive = ufloat(0.3, 0.01)
negative = ufloat(-0.3, 0.01)
# http://stackoverflow.com/questions/10282674/difference-between-the-built-in-pow-and-math-pow-for-floats-in-python
try:
umath_core.pow(ufloat(0, 0.1), negative)
except (ValueError, OverflowError) as err:
err_class = err.__class__ # For Python 3: err is destroyed after except
else:
err_class = None
err_msg = 'A proper exception should have been raised'
# An exception must have occurred:
assert err_class == ValueError, err_msg
try:
result = umath_core.pow(negative, positive)
except ValueError:
# The reason why it should also fail in Python 3 is that the
# result of Python 3 is a complex number, which uncertainties
# does not handle (no uncertainties on complex numbers). In
# Python 2, this should always fail, since Python 2 does not
# know how to calculate it.
pass
else:
raise Exception('A proper exception should have been raised')
def test_power_special_cases():
'''
Checks special cases of umath_core.pow().
'''
test_uncertainties.power_special_cases(umath_core.pow)
# We want the same behavior for numbers with uncertainties and for
# math.pow() at their nominal values.
positive = ufloat(0.3, 0.01)
negative = ufloat(-0.3, 0.01)
# The type of the expected exception is first determined, because
# it varies between versions of Python (OverflowError in Python
# 2.6+, ValueError in Python 2.5,...):
try:
math.pow(0, negative.nominal_value)
except Exception, err_math: # "as", for Python 2.6+
# Python 3 does not make exceptions local variables: they are
# restricted to their except block:
err_math_args = err_math.args
exception_class = err_math.__class__