At Sunday 14/1/2007 20:32, [EMAIL PROTECTED] wrote:
Of course, none of this really has anything to do with rational
numbers. There must be many examples of classes for which internal
calls to __init__, from other methods of the same class, require
minimal argument processing, while external calls require heavier and
possibly computationally expensive processing. What's the usual way
to solve this sort of problem?
In some cases you can differentiate by the type or number of
arguments, so __init__ is the only constructor used.
In other cases this can't be done, then you can provide different
constructors (usually class methods or static methods) with different
names, of course. See the datetime class, by example. It has many
constructors (today(), fromtimestamp(), fromordinal()...) all of them
class methods; it is a C module.
For a slightly different approach, see the TarFile class (this is a
Python module). It has many constructors (classmethods) like taropen,
gzopen, etc. but there is a single public constructor, the open()
classmethod. open() is a factory, dispatching to other constructors
depending on the combination of arguments used.
--
Gabriel Genellina
Softlab SRL
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