RE: [Jython-users] Getting Python-like dictionaries?

[James C. <ji...@mi...>]

I have a different kind of approach that might be interesting... if you
have a Java class that either is a or has a Hashtable -like (could be
HapMap, etc) dictionary You can create a Python subclass that accesses
it using the access methods:

For instance the java java.util.Properties class has a hashtable, and
get and set methods... to make it pythonic:

class PyProperties(java.util.Properties):
   =20
    def __getattr__(self, name):
        return self.getProperty(name)
       =20
    def __setattr__(self, name, value):
        self.setProperty(name, str(value))
        return value

Then in Jython:
>>>  p =3D PyProperties()
>>>  p['ten'] =3D 'eleven'
>>>  p['ten']
eleven
     =20
The one thing I haven't tried, but will try soon is to implement methods
in Java that have the names __getattr__ and __setattr__  so that there
is no python sub-classing necessary. =20

-Jim


> -----Original Message-----
> From: Dinu Gherman [mailto:gh...@da...]=20
> Sent: Tuesday, May 28, 2002 12:22 PM
> To: jyt...@li...
> Subject: Re: [Jython-users] Getting Python-like dictionaries?
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> Pedroni <pe...@in...>:
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> > in your case the more interesting part is [...]
> > or more precisely whether
> >=20
> > import java.util
> > isinstance(dict,java.lang.Dictionary) or=20
> instance(dict,java.lang.Map)
> >=20
> > is true, in that case Jython does the work for you and
> > you can use dict[...], dict[...] =3D  (see JythonEss p. 117)
> >=20
> > otherwise you should write a wrapper yourself.
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> Yep, it turns out the following code gets the job done (nasty=20
> imports omitted ;-):
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>     def convertNSDictionaryToPyDict(nsDict):
>         "Convert an NSDictionary to a Jython Dictionary."=20
>    =20
>         myPool =3D NSAutoreleasePool.push()
>    =20
>         dict =3D {}
>         keyEnum =3D nsDict.keyEnumerator()
>         while keyEnum.hasMoreElements():
>             k =3D keyEnum.nextElement()
>             dict[k] =3D nsDict.objectForKey(k)
>    =20
>         NSAutoreleasePool.pop(myPool)
>    =20
>         return dict=20
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> Thanks, Samuele and Danny!
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> Dinu
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> _______________________________________________________________
>=20
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> Conference August 25-28 in Las Vegas --=20
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>=20