I moved the state into the Until instance vs. the Until class, so that
it now supports nesting. But the calling syntax is even uglier - but
necessary to avoid creating a new Until instance each time around.
That is "while Until(blah):" evaluates and constructs a new Until
instance each time around the loop, so that is why the state had to be
kept in a class-level variable in your original design (which is why
nesting doesn't work).
class Until:
def __init__(self, mybool):
self.lastTest = True
self.mybool = mybool
def __nonzero__(self):
ret,self.lastTest = self.lastTest,self.mybool()
return ret
i = 0
u1 = Until(lambda : i < 0 )
while u1:
print "hello"
i += 1
j = 0
u2 = Until(lambda : j < 0 )
while u2:
print "byebye"
j += 1
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