Neil Cerutti a écrit : > On 2007-12-05, Bruno Desthuilliers > <[EMAIL PROTECTED]> wrote: > >>[EMAIL PROTECTED] a écrit : >> >>>Is it possible to find out if an object is of a certain type >>>or of a type derived from this type? >> >>You have the answer, thanks to Diez and Christian. Now unless >>you have a *very* compelling reason to check the type of an >>object, *just forget about it*. 9 times out of 10, this is >>fighting against the language's type system (hint: google for >>"duck typing"). > > > As I understand Python practice (and this is pretty limited, so > corrections or other use cases are welcome), type checking is > useful for overloading functions by argument type, e.g., > __getitem__, which accepts both integers and slice objects as > keys for sequence types.
Yeps, this is one of the couple occasions you might want to know something about the object's type. The few other use case I had where mostly about the same pattern - "low-level" and somewhat dirty code. > Although in the case of __getitem__, et > al, it seems like the key type could have been unified to slices > (except I suppose the return type also change, er... except for > strings--oh never mind). > !-) -- http://mail.python.org/mailman/listinfo/python-list
