Get List of Classes

[digitalorganics]

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]

> 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.

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.

def inspect(thing, name = '', indent=0): .... 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(objname),
.... objname, indent+1)
.... elif isinstance(thing, object):
.... print "%s%s is an object" % ("\t" * indent, name)
.... import m1
# m1 is a junk module that references module "m2" and has
# some junk classes in it
inspect(m1, "m1")

Module m1
m1.M1Class is an object
m1.M1ObjectClass 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.M2ObjectClass is an object
m1.m2.__builtins__ 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]

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:

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.

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.

>>> def inspect(thing, name = '', indent=0): ... 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(objname),
... objname, indent+1)
... elif isinstance(thing, object):
... print "%s%s is an object" % ("\t" * indent, name)
... >>> import m1
>>> # m1 is a junk module that references module "m2" and has
>>> # some junk classes in it
>>> inspect(m1, "m1")

Module m1
m1.M1Class is an object
m1.M1ObjectClass 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.M2ObjectClass is an object
m1.m2.__builtins__ 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

[Maric Michaud]

Le lundi 26 juin 2006 17:25, Tim Chase a écrit*:

*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.

Why not :

In [8]: import types, sys

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

?
Seems rather explicit IMO.

--
_____________

Maric Michaud
_____________

Aristote - www.aristote.info
3 place des tapis
69004 Lyon
Tel: [phone]

[Tim Chase]

>> 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.

Why not :

In [8]: import types, sys

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

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