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|
from functools import total_ordering
__version__ = '1.5'
@total_ordering
class Infinity(object):
def __init__(self, positive=True):
self.positive = positive
def __neg__(self):
return Infinity(not self.positive)
def __gt__(self, other):
if self == other:
return False
return self.positive
def __eq__(self, other):
return (
isinstance(other, self.__class__) and
other.positive == self.positive
) or (
self.positive and other == float('inf')
) or (
not self.positive and other == float('-inf')
)
def __ne__(self, other):
return not (self == other)
def __bool__(self):
return True
def __nonzero__(self):
return True
def __str__(self):
return '%sinf' % ('' if self.positive else '-')
def __float__(self):
return float(str(self))
def __add__(self, other):
if is_infinite(other) and other != self:
return NotImplemented
return self
def __radd__(self, other):
return self
def __sub__(self, other):
if is_infinite(other) and other == self:
return NotImplemented
return self
def __rsub__(self, other):
return self
def timetuple(self):
return tuple()
def __abs__(self):
return self.__class__()
def __pos__(self):
return self
def __div__(self, other):
if is_infinite(other):
return NotImplemented
return Infinity(
other > 0 and self.positive or other < 0 and not self.positive
)
def __rdiv__(self, other):
return 0
def __repr__(self):
return str(self)
__truediv__ = __div__
__rtruediv__ = __rdiv__
__floordiv__ = __div__
__rfloordiv__ = __rdiv__
def __mul__(self, other):
if other == 0:
return NotImplemented
return Infinity(
other > 0 and self.positive or other < 0 and not self.positive
)
__rmul__ = __mul__
def __pow__(self, other):
if other == 0:
return NotImplemented
elif other == -self:
return -0.0 if not self.positive else 0.0
else:
return Infinity()
def __rpow__(self, other):
if other in (1, -1):
return NotImplemented
elif other == -self:
return -0.0 if not self.positive else 0.0
else:
return Infinity()
def __hash__(self):
return (self.__class__, self.positive).__hash__()
inf = Infinity()
def is_infinite(value):
return value == inf or value == -inf
|
