pm.hasAttr(obj,'getShape') not working, even though obj.getShape() works...

[Brian Eyre]

Hi,

I'm trying to add a line that error checks for whether the getShape() method exists for selected objects, by using hasAttr, but it keeps returning false even when getShape() exists for the obj:

import maya.cmds as cmd
import pymel.core as pm
   
list = cmd.ls(sl=True)

for obj in list:
    obj = pm.PyNode(obj)
    print pm.hasAttr(obj,'getShape')


Any ideas??


   

[Kurian O.S]

hasAttr will check only for existing attribute.

import maya.cmds as cmd import pymel.core as pm list = cmd.ls(sl=True) for obj in list:     obj = pm.PyNode(obj)

print pm.hasAttr(obj,'tx')

This will work and what is getShape ?, is it a function ? or is it attribute which is existed in selected object ?

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[Kurian O.S]

http://download.autodesk.com/us/maya/2011help/PyMel/generated/functions/pymel.core.general/pymel.core.general.hasAttr.html

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[Brian Eyre]

It's actually a function that returns the shape node, yes.  Do I need a different syntax for that?  obj.getShape() definitely works, which is why i'm puzzled.

On Tuesday, June 17, 2014 3:20:19 PM UTC-7, Kurian wrote:

hasAttr will check only for existing attribute.

import maya.cmds as cmd import pymel.core as pm list = cmd.ls(sl=True) for obj in list:     obj = pm.PyNode(obj)     print pm.hasAttr(obj,'tx')

This will work and what is getShape ?, is it a function ? or is it attribute which is existed in selected object ?

On Tue, Jun 17, 2014 at 3:08 PM, Brian Eyre <brian...@googlemail.com> wrote:

Hi,

I'm trying to add a line that error checks for whether the getShape() method exists for selected objects, by using hasAttr, but it keeps returning false even when getShape() exists for the obj:

import maya.cmds as cmd
import pymel.core as pm
   
list = cmd.ls(sl=True)

for obj in list:
    obj = pm.PyNode(obj)
    print pm.hasAttr(obj,'getShape')


Any ideas??


   

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--:: Kurian ::--

[Kurian O.S]

import maya.cmds as cmd import pymel.core as pm list = cmd.ls(sl=True) for obj in list:     obj = pm.PyNode(obj)

if obj.getShape():         print obj.getShape()

Are you looking for this ?

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[Brian Eyre]

No, sorry.  That returns an error if obj happens to have no getShape() method, which is what i'm rying to check for...

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--:: Kurian ::--

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[Kurian O.S]

I didn't use pymel much, but I am not sure you can check a function with hasAttr. Maybe some one will have better idea, I would go for a AttributeError check with try.

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[Kurian O.S]

import maya.cmds as cmd import pymel.core as pm list = cmd.ls(sl=True) for obj in list:     obj = pm.PyNode(obj)

print hasattr(obj,'getShape')

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[Kurian O.S]

Just a note hasattr is not a pymel function its a python built in method. https://docs.python.org/2/library/functions.html#hasattr

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[Brian Eyre]

Oh, that's brilliant, thanks!  Wasn't aware of 'try'.. so this seems to work:

import maya.cmds as cmd
import pymel.core as pm
   

list = pm.ls(sl=1)

for obj in list:
    obj = pm.PyNode(obj)

    try:
        print obj.getShape()
    except:
        pm.warning('no shape!')

If anyone knows why hasattr(obj,'getShape') does't work, please let me know!

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--:: Kurian ::--

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[Kurian O.S]

I replied already I think :)

python built in hasattr will also work for you

import maya.cmds as cmd import pymel.core as pm list = cmd.ls(sl=True) for obj in list:     obj = pm.PyNode(obj)

print hasattr(obj,'getShape')

https://docs.python.org/2/library/functions.html#hasattr

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[Brian Eyre]

Oh, weird,

I could have sworn i just  tried that and it didn't work.. but it works, thanks ;-)

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--:: Kurian ::--

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[Justin Israel]

Sorry if this is late info but, the Maya hasAttr is meant to check for the existence of attributes on an object.  But these are not functions as everything in Maya command API are string references and you use function calls only to perform certain operations on string references 
Python has a similar hasattr which tells you if a python object has a certain member attribute  

In your case,  neither of these applied, as what you were after was just to try and call the PyMel getShape and handle the specific AttributeError

Hope that was clear enough? Let me know if you need more details on that 

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