#=======================================================================
__version__ = '''0.0.01'''
__sub_version__ = '''20041028004506'''
__copyright__ = '''(c) Alex A. Naanou 2003'''
#-----------------------------------------------------------------------
#------------------------------------------------------------_Compare---
class _Compare(object):
'''
'''
def __init__(self, eq):
self._eq = eq
def __cmp__(self, other):
return self._eq
def __eq__(self, other):
return self._eq == 0
def __ne__(self, other):
return self._eq != 0
def __gt__(self, other):
return self._eq > 0
def __ge__(self, other):
return self._eq >= 0
def __lt__(self, other):
return self._eq < 0
def __le__(self, other):
return self._eq <= 0
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# this will compare to any value as equal (almost opposite to None)
ANY = _Compare(0)
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# this is bigger than any value... (absolute maximum)
MAXIMUM = _Compare(1)
#- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
# this is smaller than any value... (absolute minimum)
MINIMUM = _Compare(-1)
#=======================================================================
# NOTE: the MAXIMUM and MINIMUM objects are not discussed here as they
# are discussed in depth in PEP326 http://www.python.org/peps/pep-0326.html
if __name__ == '__main__':
# Example I:
# compare two objects by their structure...
print (ANY, (ANY, ANY)) == (1, (2, 3))
# the above comparison is eqivalent to:
print (lambda o: \
type(o) is tuple \
and len(o) == 2 \
and type(o[1]) is tuple \
and len(o[1]) == 2
)( (1, (2, 3)) )
# Example II:
# compare structure and partial value...
print ([ANY, 123], 'string', (ANY,), ANY) == ([2, 123], 'string', (0.1,), (1, 2,))
# now try and imagine the explicit code to do the same thing as
# above! :))
#=======================================================================
# vim:set ts=4 sw=4 nowrap :
