String data from list

Coding Python Support
1

Hello everyone,

I am just getting my feet wet using python in Blender, and have a question regarding strings. First of all, the goal of the first part of the program is to find the names of all objects whose names end in a particular set of characters. For example, I would like to find all objects named XXXXXpOut, where XXXXX = any string.

My thinking for doing this is to create a list of all the objects in the current scene, then test for the name condition.

When I use the following:

import Blender
from Blender import Scene, Object, Camera
myData = Blender.Scene.getCurrent().getChildren()
print myData
myObjCount = len(myData)
print myObjCount
myStr = myData[1]
print myStr

The output is:

[[Object “Cube”], [Object “Lamp”], [Object “Camera2”]]
3
[Object “Lamp”]

Now, I would like to find the length of myStr. When I use the following:

myStrLen = len(myStr)

I get:

Traceback (most recent call last):
File “Text.003”, line 9, in ?
TypeError: len() of unsized object

Is there something special about the list created using Blender.Scene.getCurrent().getChildren()? I have tried creating my own list manually, all entries are text strings in quotes, and the logic works fine. I suspect that because each entry in the list that is created using Blender.Scene.getCurrent().getChildren() has imbedded quotes [Object “Lamp”], I will have to do something different, but I’m not sure what.

Any and all help greatly appreciated!!

2

Well currently you’re just getting the actual objects.

You want to get the object names for what you want to do.

So to create a neat list of all objects in the current scene


objectlist = [ob for ob in Blender.Scene.GetCurrent().getChildren()]

You can now loop through the list, get the names and do whatever you want.


## Loop though
for a in range(len(objectlist)):
	## Get the name
	name = objectlist[a].getName();

	## Get the length of the name
	check = len(name);

	## Print out the object nr in the list, the name, and it's length
	print a, name, check;
3

Is there something special about the list created using Blender.Scene.getCurrent().getChildren()?

The returned list is a list of Objects. not strings. Pay attention to the documented return type of methods!

To get your list of objects, you can simply do


ob_list = [ ob for ob in Blender.Scene.getCurrent().getChildren() if ob.name.endswith('pOut') ]

Note: you do not need range(len()) to iterate over a list now. This works just fine:


for a in objectlist: 
      name = a.getName()
4

Thanks for the help stiv and macouno!!

So, I tried to back track, taking your info and trying to find documentation for it. I found lots of examples of “ob for ob”, but no documentation. If you have the time, could you please explain what is going on when using:

ob_list = [ ob for ob in Blender.Scene.getCurrent().getChildren() if ob.name.endswith(‘pOut’) ]

Thanks for your patience!!