python maya remove all except joints

import maya.cmds as cmds

# Get a list of all objects in the scene
all_objs = cmds.ls()

# Create an empty list to store non-joint objects
non_joints = []

# Check each object and append it to the non_joints list if it is not a joint
for obj in all_objs:
    if cmds.nodeType(obj) != 'joint':
        non_joints.append(obj)

# Delete all objects in the non_joints list
cmds.delete(non_joints)