Re: [Jython-users] Alias builtin factory functions to types

[Samuele P. <ped...@bl...>]

George Sakkis wrote:
> I want to make the factory builtin functions (int,float,list,dict, etc.)
> aliases to the respective type in types.*, as in python >= v2.2. As it is,
> code such as
>     isinstance(3,int) and int(4.56) == 4
> which is valid in current python, fails in jython. The simple
>     int = types.IntType
> solves the isinstance(3,int) problem but breaks the int(4.56), because
> IntType's constructor does not coerce the argument to int. I tried to
> rebind int.__init__ to my own function but this doesn't work either. Is
> this doable at all ? Thanks,

no, if you mean not touching the source, __init__ is cached in the form 
of a PyReflectedConstructor.

Btw, this is already implemented on the branch, although it is still not
enabled for all types.

Jython 2.2aNewstyle on java1.4.0_02 (JIT: null)
Type "copyright", "credits" or "license" for more information.
 >>> x=int(1.45)
 >>> x
1
 >>> x.__class__
<type 'int'>
 >>> type(x)
<type 'int'>
 >>> type(x) is int
1
 >>> isinstance(x,int)
1
 >>> isinstance(x,object)
1
 >>> int.__new__(int,"0xa",0)
10
 >>>

but there types are not PyJavaClasses anymore, a proper __new__ being 
one the reasons.