I'm currently trying to create a tool, to rename objects in blender, to automatically have lowercase names. I keep however getting the error: TypeError: 'list' object is not callable

My current code is below, can anyone tell me how I can fix this error?

        objs = bpy.context.scene.objects

        #o = old_name l = lowercase
        o = {n.name for n in objs}
        l = [elem.lower() for elem in o]
        count = len(objs)
        i = 0
        while i < count:
            objs[i].name = l()

edit: I want to do more with the name than just make it lowercase, but I keep getting stuck on renaming the objects in the right order so that's what I'm trying to fix here

  • $\begingroup$ Hi. l is a list. l() is trying to call the list as if it were a function, which it is not. What were hoping l() would do? $\endgroup$ Jan 17, 2020 at 16:00
  • $\begingroup$ I want l to contain the new names of the objects, and assign them as the object name using objs[i].name $\endgroup$ Jan 17, 2020 at 16:06

1 Answer 1


Currently your script performs several unnecessary operations when your goal is to rename the objects.

  • You're creating a set of object names by using the {} syntax, which isn't necessary since the names are guaranteed to be unique.
  • Unless you intend to re-use the old names, it's not necessary to store them.
  • You likely don't need to store the new lowercase names either, if you perform your action while iterating over the objects.
  • Don't use a while loop when you intend to index elements. Use a for loop instead, especially if the object is iterable.
  • The l is a list of strings, therefore using l() would result in a TypeError, since a list can't be called. It's not a function.

The solution would be to iterate over the objects and rename them one by one.

import bpy

for obj in bpy.context.scene.objects:
    obj.name = obj.name.lower()
    # Perform additional tasks with the renamed object here

If you have to store the lowercase names in a list:

import bpy

names_lowercase = []

for obj in bpy.context.scene.objects:
    name = obj.name.lower()
    obj.name = name
  • $\begingroup$ Thanks, this really helped me out $\endgroup$ Jan 20, 2020 at 14:09

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