These are special method names. View section 3.4 and below here
http://docs.python.org/reference/datamodel.html On Wed, Aug 4, 2010 at 11:37 AM, Alex Hall <mehg...@gmail.com> wrote: > It worked, thanks. Is there a list of these functions somewhere? That > is, the functions that map implicitly to operators or implied uses? > For example, printing will call __str__, as will a cal to str(). What > about math or comparison operators? I have heard of __eq__, __gt__, > and so on, but I tried to implement one and I got an error saying that > it required three arguments. It did, but only because the first was > self. I put the function inside my card class: > def __eq__(self, card1, card2): > return(card1.rank==card2.rank) > #end def __eq__ > For some reason it is still looking for three arguments... > > > On 8/4/10, Huy Ton That <huyslo...@gmail.com> wrote: > > You could write __str__ function > > > >>>> class card(object): > > ... def __init__(self, card1, card2): > > ... self.card1, self.card2 = card1, card2 > > ... def __str__(self): > > ... return str(str(self.card1)+','+str(self.card2)) > > ... > >>>> a = card(0,0) > >>>> str(a) > > '0,0' > > > > On Wed, Aug 4, 2010 at 10:37 AM, Alex Hall <mehg...@gmail.com> wrote: > > > >> Hi all, > >> I have a card class. A card object simply consists of a pair of > >> numbers; 0,0 might be the ace of clubs, for example. I have a toString > >> method in my card class. Is there a way to just say str(card) instead > >> of card.toString()? Maybe some sort of basic, built-in function to > >> override? TIA. Oh, what about doing the same with operators? For > >> example, could I get the program to call my own math functions when it > >> sees a card object in a math expression, like > >> if(card1==card2) > >> > >> -- > >> Have a great day, > >> Alex (msg sent from GMail website) > >> mehg...@gmail.com; http://www.facebook.com/mehgcap > >> _______________________________________________ > >> Tutor maillist - Tutor@python.org > >> To unsubscribe or change subscription options: > >> http://mail.python.org/mailman/listinfo/tutor > >> > > > > > -- > Have a great day, > Alex (msg sent from GMail website) > mehg...@gmail.com; http://www.facebook.com/mehgcap >
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