def descr_as_integer_ratio(self, space):
"""float.as_integer_ratio() -> (int, int)
Return a pair of integers, whose ratio is exactly equal to the
original float and with a positive denominator. Raise
OverflowError on infinities and a ValueError on NaNs.
>>> (10.0).as_integer_ratio()
(10, 1)
>>> (0.0).as_integer_ratio()
(0, 1)
>>> (-.25).as_integer_ratio()
(-1, 4)
"""
value = self.floatval
try:
num, den = float_as_rbigint_ratio(value)
except OverflowError:
raise oefmt(space.w_OverflowError,
"cannot pass infinity to as_integer_ratio()")
except ValueError:
raise oefmt(space.w_ValueError,
"cannot pass nan to as_integer_ratio()")
w_num = space.newlong_from_rbigint(num)
w_den = space.newlong_from_rbigint(den)
# Try to return int
return space.newtuple([space.int(w_num), space.int(w_den)])
def descr_as_integer_ratio(self, space):
value = self.floatval
try:
num, den = float_as_rbigint_ratio(value)
except OverflowError:
raise oefmt(space.w_OverflowError, "cannot pass infinity to as_integer_ratio()")
except ValueError:
raise oefmt(space.w_ValueError, "cannot pass nan to as_integer_ratio()")
w_num = space.newlong_from_rbigint(num)
w_den = space.newlong_from_rbigint(den)
# Try to return int
return space.newtuple([space.int(w_num), space.int(w_den)])
def descr_as_integer_ratio(self, space):
value = self.floatval
try:
num, den = float_as_rbigint_ratio(value)
except OverflowError:
raise oefmt(space.w_OverflowError,
"cannot pass infinity to as_integer_ratio()")
except ValueError:
raise oefmt(space.w_ValueError,
"cannot pass nan to as_integer_ratio()")
w_num = space.newlong_from_rbigint(num)
w_den = space.newlong_from_rbigint(den)
# Try to return int
return space.newtuple([space.int(w_num), space.int(w_den)])
def float_as_integer_ratio__Float(space, w_float):
value = w_float.floatval
try:
num, den = float_as_rbigint_ratio(value)
except OverflowError:
w_msg = space.wrap("cannot pass infinity to as_integer_ratio()")
raise OperationError(space.w_OverflowError, w_msg)
except ValueError:
w_msg = space.wrap("cannot pass nan to as_integer_ratio()")
raise OperationError(space.w_ValueError, w_msg)
w_num = space.newlong_from_rbigint(num)
w_den = space.newlong_from_rbigint(den)
# Try to return int
return space.newtuple([space.int(w_num), space.int(w_den)])
def descr_as_integer_ratio(self, space):
value = self.floatval
try:
num, den = float_as_rbigint_ratio(value)
except OverflowError:
raise oefmt(space.w_OverflowError,
"no puede pasar infinito a como_ratio_entero()")
except ValueError:
raise oefmt(space.w_ValueError,
"no puede pasar NuN a como_ratio_entero()")
w_num = space.newlong_from_rbigint(num)
w_den = space.newlong_from_rbigint(den)
# Try to return int
return space.newtuple([space.int(w_num), space.int(w_den)])
def test_float_as_rbigint_ratio():
for f, ratio in [
(0.875, (7, 8)),
(-0.875, (-7, 8)),
(0.0, (0, 1)),
(11.5, (23, 2)),
]:
num, den = float_as_rbigint_ratio(f)
assert num.eq(rbigint.fromint(ratio[0]))
assert den.eq(rbigint.fromint(ratio[1]))
with py.test.raises(OverflowError):
float_as_rbigint_ratio(float('inf'))
with py.test.raises(OverflowError):
float_as_rbigint_ratio(float('-inf'))
with py.test.raises(ValueError):
float_as_rbigint_ratio(float('nan'))
def test_float_as_rbigint_ratio():
for f, ratio in [
(0.875, (7, 8)),
(-0.875, (-7, 8)),
(0.0, (0, 1)),
(11.5, (23, 2)),
]:
num, den = float_as_rbigint_ratio(f)
assert num.eq(rbigint.fromint(ratio[0]))
assert den.eq(rbigint.fromint(ratio[1]))
with py.test.raises(OverflowError):
float_as_rbigint_ratio(float('inf'))
with py.test.raises(OverflowError):
float_as_rbigint_ratio(float('-inf'))
with py.test.raises(ValueError):
float_as_rbigint_ratio(float('nan'))
