object data member dumper?

[tom arnall]

> 
> object data member dumper?
> George Sakkis george.sakkis at gmail.com
> Wed Nov 8 03:42:47 CET 2006

> tom arnall wrote:
> 
> > Bruno Desthuilliers wrote:
> >
> > > tom arnall a écrit :
> > >> does anyone know of a utility to do a recursive dump of object data
> > >> members?
> > >>
> > >
> > > What are "object data members" ? (hint: in Python, everything is an
> > > object - even functions and methods).
> > >
> > > What is your real use case ?
> >
> > something like:
> >
> >    class A:
> >       def __init__(self, p1):
> >          self.p1 = p1
> >
> >    class B:
> >       def __init__(self,p1, p2):
> >          self.a = A(p1)
> >          self.p2 = p2
> >          self.v1 = '3'
> >
> >    class C:
> >       def __init__(self):
> >          self.b = B(3,4)
> >          self.p3 = 5
> >
> >    class D:
> >       def __init__(self):
> >          self.v2=2
> >          self.o1 = C()
> >          self.o2 = B(11,12)
> >
> >
> >    d = D()
> >    objectDataDumper(d)
> >
> >
> > would produce something like:
> >
> >    object of class D with:
> >    o1(C)->b(B)->a(A)->p1=3
> >    o1(C)->b(B)->p2=4
> >    o1(C)->b(B)->v1=3
> >    o1(C)->p3=5
> >    o2(B)->a(A)->p1=11
> >    o2(B)->p2=12
> >    o2(B)->v1=3
> >    v2=2
> >
> >
> > tom arnall
> > north spit, ca
> > usa
> 
> At first I thought pickle would be what you're looking for, because
> that's exactly what it does; it dumps arbitrary objects, without
> choking on recursive references. Only problem is, it's not human
> readable (even in its ascii form).If you want it to be human readable,
> you may check the gnosis.xml.pickle module
> (http://cheeseshop.python.org/pypi/Gnosis_Utils/1.2.1-a). That's the
> output of gnosis.xml.pickle.XML_Pickler(d).dumps() on your example:
> 
> <?xml version="1.0"?>
> <!DOCTYPE PyObject SYSTEM "PyObjects.dtd">
> <PyObject module="__main__" class="D" id="-1210610740">
> <attr name="v2" type="numeric" value="2" />
> <attr name="o2" type="PyObject" id="-1211043316" module="__main__"
> class="B">
>   <attr name="a" type="PyObject" id="-1211043220" module="__main__"
> class="A">
>     <attr name="p1" type="numeric" value="11" />
>   </attr>
>   <attr name="p2" type="numeric" value="12" />
>   <attr name="v1" type="string" value="3" />
> </attr>
> <attr name="o1" type="PyObject" id="-1211199412" module="__main__"
> class="C">
>   <attr name="p3" type="numeric" value="5" />
>   <attr name="b" type="PyObject" id="-1211082644" module="__main__"
> class="B">
>     <attr name="a" type="PyObject" id="-1211067156" module="__main__"
> class="A">
>      <attr name="p1" type="numeric" value="3" />
>     </attr>
>     <attr name="p2" type="numeric" value="4" />
>     <attr name="v1" type="string" value="3" />
>   </attr>
> </attr>
> </PyObject>
> 
> 
> I've also written a similar but less verbose xml dumper. The gnosis.xml
> package provides a bidirectional mapping between objects and xml
> (objects -> xml and xml->object) and therefore has to be precise; mine
> simply generates a nice xml dump of the object which isn't necessarily
> reversible. Here's the output for your example:
> 
> <root type="__main__.D">
>   <o1 type="__main__.C">
>     <b type="__main__.B">
>       <a type="__main__.A">
>       <p1 type="int">3</p1>
>       </a>
>       <p2 type="int">4</p2>
>       <v1 type="str">3</v1>
>     </b>
>     <p3 type="int">5</p3>
>   </o1>
>   <o2 type="__main__.B">
>     <a type="__main__.A">
>       <p1 type="int">11</p1>
>     </a>
>     <p2 type="int">12</p2>
>     <v1 type="str">3</v1>
>   </o2>
>   <v2 type="int">2</v2>
> </root>
> 
> 
> If you find it suits you better, I'll try to make it available
> somewhere (probably in the cookbook).
> 
> George


George,

did you ever put your object dumper on the internet?

tom arnall
north spit, ca
usa


"Make cyberspace pretty: stamp out curly brackets and semicolons."


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