sys.maxint in Python 3

[bearophileHUGS]

In some algorithms a sentinel value may be useful, so for Python 3.x
sys.maxint may be replaced by an improvement of the following infinite
and neginfinite singleton objects:

class Infinite(object):
def __repr__(self): return "infinite"
def __cmp__(self, other):
if other is infinite: return 0
if other is neginfinite: return 1
other + 1 # type control
return 1
infinite = Infinite()

class NegInfinite(object):
def __repr__(self): return "neginfinite"
def __cmp__(self, other):
if other is neginfinite: return 0
if other is infinite: return -1
other + 1 # type control
return -1
neginfinite = NegInfinite()

Bye,
bearophile

[Christian Heimes]

be************@lycos.com schrieb:

In some algorithms a sentinel value may be useful, so for Python 3.x
sys.maxint may be replaced by an improvement of the following infinite
and neginfinite singleton objects:

Python 3.0 doesn't have sys.maxint any more since Python 3's ints are of
arbitrary length. Instead of sys.maxint it has sys.maxsize; the maximum
size of a positive sized size_t aka Py_ssize_t.

Christian

[Christian Heimes]

be************@lycos.com schrieb:

In some algorithms a sentinel value may be useful, so for Python 3.x
sys.maxint may be replaced by an improvement of the following infinite
and neginfinite singleton objects:

Python 3.0 doesn't have sys.maxint any more since Python 3's ints are of
arbitrary length. Instead of sys.maxint it has sys.maxsize; the maximum
size of a positive sized size_t aka Py_ssize_t.

Christian

[Paul Rubin]

be************@lycos.com writes:

In some algorithms a sentinel value may be useful, so for Python 3.x

Better to just use object() to generate sentinels.

[castironpi]

On Apr 21, 5:20*pm, Paul Rubin <http://[e-mail]:

[e-mail] writes:

In some algorithms a sentinel value may be useful, so for Python 3.x

Better to just use object() to generate sentinels.

Infinity is a number that compares always like.