What is the mechanism behide?
marklists at mceahern.com
Tue Sep 24 18:31:31 CEST 2002
> I'm studying the singleton pattern, there are something I don't
> understand in the sample code below:
> I'm puzzled that what is behide the statement "print x" ?
This is a more straightforward sample to cut your teeth on, imho:
>>> class foo:
... def __str__(self):
... print "calling __str__"
... return "whatever we like"
... def __repr__(self):
... print "calling __repr__"
... return "something different"
>>> f = foo()
>>> print f
whatever we like
>>> print `f`
So __str__ simply allows you to override what happens when str() is called
on an instance of your class. str() is what print calls, I believe.
__repr__ allows you to override what happens when repr() is called. The
backticks (e.g., ``) are equivalent to repr().
You might want to lookup print, __str__, __repr__, str(), and repr() in the
I don't have the patience to decode the OnlyOne stuff. Perhaps someone else
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