Newbie questions
David Grenier
grenieda at hotmail.com
Thu Nov 15 09:35:54 EST 2001
Ok got two problems, we're trying to build a mini-scheme interpreter. But I
still think you people could figure out my problem without even knowing
scheme.
class cons:
"""structure de donnée de base pour les paires Scheme"""
def __init__(self,carpart,cdrpart):
self.car = carpart
self.cdr = cdrpart
def __str__(self):
a='(' + str(self.car)
champ=self.cdr
while type(champ)=='instance':
a=a + ' ' + str(champ.car)
champ=champ.cdr
a=a + ' ' + str(champ) + ')'
return a
This builds a cons, a pair as in scheme, when printing it it should output
something like this:
(1 2 3 1) but it seems (i don't understand why and I think I cheked it) to
ouput it like that (1 (2 (3 1))), note that a liste (made of cons) in scheme
is made like this: cons(1 cons(1,2)) this would create the list (1 1 2).
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