Get List of Classes

[digitalorganics@gmail.com]

Is there a method or attribute I can use to get a list of classes
defined or in-use within my python program? I tried using pyclbr and
readmodule but for reason that is dogslow. Thanks in advance....

DigiO

[Tim Chase]

Re: Get List of Classes

> Is there a method or attribute I can use to get a list of[color=blue]
> classes defined or in-use within my python program? I tried
> using pyclbr and readmodule but for reason that is dogslow.[/color]

Well, given that so much in python is considered a class, the
somewhat crude code below walks an object/module and emits
details regarding what's going on. I couldn't find any nice
method for determining if a variable referenced a module other
than checking to see if that item had both a "__file__" and a
"__name__" attribute. Likewise, the check for whether something
is an object is a bit crude.

[color=blue][color=green][color=darkred]
>>> def inspect(thing, name = '', indent=0):[/color][/color][/color]
.... if hasattr(thing, "__file__") and hasattr(thing, "__name__") :
.... #assume it's a module
.... print "%sModule %s" % ("\t" * indent, thing.__name__)
.... for subthing in dir(thing):
.... objname = ".".join([name,
subthing]).lstrip(".")
.... inspect(eval(ob jname),
.... objname, indent+1)
.... elif isinstance(thin g, object):
.... print "%s%s is an object" % ("\t" * indent, name)
....[color=blue][color=green][color=darkred]
>>> import m1
>>> # m1 is a junk module that references module "m2" and has
>>> # some junk classes in it
>>> inspect(m1, "m1")[/color][/color][/color]
Module m1
m1.M1Class is an object
m1.M1ObjectClas s is an object
m1.__builtins__ is an object
m1.__doc__ is an object
m1.__file__ is an object
m1.__name__ is an object
Module m2
m1.m2.M2Class is an object
m1.m2.M2ObjectC lass is an object
m1.m2.__builtin s__ is an object
m1.m2.__doc__ is an object
m1.m2.__file__ is an object
m1.m2.__name__ is an object



You could also filter out builtin object properties by wrapping
that last print statement in something like

if not name.startswith ("_"): print ...

which might cut down on some of the noise.

Just a few ideas.

-tkc

[digitalorganics@gmail.com]

Re: Get List of Classes

Wow, more than I had asked for, thank you Tim!

I ended up doing this:

def isClass(object) :
if 'classobj' in str(type(object )):
return 1
elif "'type'" in str(type(object )):
return 1
else:
return 0
def listClasses():
classes = []
for eachobj in globals().keys( ):
if isClass(globals ()[eachobj]):
classes.append( globals()[eachobj])
print eachobj
return classes

Tim Chase wrote:[color=blue][color=green]
> > Is there a method or attribute I can use to get a list of
> > classes defined or in-use within my python program? I tried
> > using pyclbr and readmodule but for reason that is dogslow.[/color]
>
> Well, given that so much in python is considered a class, the
> somewhat crude code below walks an object/module and emits
> details regarding what's going on. I couldn't find any nice
> method for determining if a variable referenced a module other
> than checking to see if that item had both a "__file__" and a
> "__name__" attribute. Likewise, the check for whether something
> is an object is a bit crude.
>
>[color=green][color=darkred]
> >>> def inspect(thing, name = '', indent=0):[/color][/color]
> ... if hasattr(thing, "__file__") and hasattr(thing, "__name__") :
> ... #assume it's a module
> ... print "%sModule %s" % ("\t" * indent, thing.__name__)
> ... for subthing in dir(thing):
> ... objname = ".".join([name,
> subthing]).lstrip(".")
> ... inspect(eval(ob jname),
> ... objname, indent+1)
> ... elif isinstance(thin g, object):
> ... print "%s%s is an object" % ("\t" * indent, name)
> ...[color=green][color=darkred]
> >>> import m1
> >>> # m1 is a junk module that references module "m2" and has
> >>> # some junk classes in it
> >>> inspect(m1, "m1")[/color][/color]
> Module m1
> m1.M1Class is an object
> m1.M1ObjectClas s is an object
> m1.__builtins__ is an object
> m1.__doc__ is an object
> m1.__file__ is an object
> m1.__name__ is an object
> Module m2
> m1.m2.M2Class is an object
> m1.m2.M2ObjectC lass is an object
> m1.m2.__builtin s__ is an object
> m1.m2.__doc__ is an object
> m1.m2.__file__ is an object
> m1.m2.__name__ is an object
>
>
>
> You could also filter out builtin object properties by wrapping
> that last print statement in something like
>
> if not name.startswith ("_"): print ...
>
> which might cut down on some of the noise.
>
> Just a few ideas.
>
> -tkc[/color]

[Maric Michaud]

Re: Get List of Classes

Le lundi 26 juin 2006 17:25, Tim Chase a écrit :[color=blue]
>  I couldn't find any nice
> method for determining if a variable referenced a module other
> than checking to see if that item had both a "__file__" and a
> "__name__" attribute.[/color]
Why not :

In [8]: import types, sys

In [9]: isinstance(sys, types.ModuleTyp e)
Out[9]: True

?
Seems rather explicit IMO.

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: +33 426 880 097

[Tim Chase]

Re: Get List of Classes

>> I couldn't find any nice method for determining if a[color=blue][color=green]
>> variable referenced a module other than checking to see if
>> that item had both a "__file__" and a "__name__" attribute.[/color]
>
> Why not :
>
> In [8]: import types, sys
>
> In [9]: isinstance(sys, types.ModuleTyp e)
> Out[9]: True[/color]

Yes...this is the best way to do it. I hadn't explored (or even
noticed, before your reply) the "types" module, which seems to
have a large toolset for doing exactly what I wanted to. Thanks!

A good programming language has users asking "how did I miss
that?" rather than "why can't I make it do what I want?". Yet
another feather in Python's cap.

-tkc