Blender Crashes when i use Python Script

Question

I have a python script which works fine but it is not working Blender freezes as install the addon and Execute it as I have mentioned the code itself works fine. Here Is the Final code:

def main(context):
     # You should change this varibale in "here" to match your own directory path
     # use '/' or '\\' for hirecacy
    target_dir = "C:/Users/Arpit/Desktop/UV/" 
    selObj = []

    for obj in bpy.context.selected_objects:
        selObj.append(obj.name)
        bpy.ops.object.select_all(action='TOGGLE')

    # --- while-loop ---
    
    i = 0

    while i < len(selObj):
        obj = bpy.context.window.scene.objects[0]
        bpy.context.view_layer.objects.active = obj
        bpy.ops.object.mode_set(mode="EDIT")
        bpy.ops.mesh.select_all(action='TOGGLE')
        bpy.ops.mesh.select_all(action='TOGGLE')
        full_file_name = target_dir + bpy.data.objects[selObj[i]].name
        dirname = os.path.dirname(full_file_name)

        # inside `while`-loop
        if not os.path.exists(dirname):
            os.makedirs(dirname)

        bpy.ops.uv.export_layout(filepath=full_file_name, mode='PNG', size=(4096, 4096), opacity=0.6)
        bpy.ops.object.mode_set(mode="OBJECT")
        bpy.ops.object.select_all(action='TOGGLE')

        i += 1
  

Answer 1

I can't run it but I see some mistakes with indentations - and this can make problem and code may run in endless loop and freeze program.

You put if in the same column as while so it finishs while-loop and rest is executed after exiting this loop. But this loop check i to exit and now you have i += 1 outside this loop so it never change this i .

If you change indentations then if will be inside loop and i += 1 will be also inside loop and this should resolve problem with freezing.

def main(context):

    target_dir = "C:/Users/Arpit/Desktop/UV/" 
    selObj = []

    for obj in bpy.context.selected_objects:
        selObj.append(obj.name)
        bpy.ops.object.select_all(action='TOGGLE')

    # --- while-loop ---
    
    i = 0

    while i < len(selObj):
        obj = bpy.context.window.scene.objects[0]
        bpy.context.view_layer.objects.active = obj
        bpy.ops.object.mode_set(mode="EDIT")
        bpy.ops.mesh.select_all(action='TOGGLE')
        bpy.ops.mesh.select_all(action='TOGGLE')
        full_file_name = target_dir + bpy.data.objects[selObj[i]].name
        dirname = os.path.dirname(full_file_name)

        # inside `while`-loop
        if not os.path.exists(dirname):
            os.makedirs(dirname)

        bpy.ops.uv.export_layout(filepath=full_file_name, mode='PNG', size=(4096, 4096), opacity=0.6)
        bpy.ops.object.mode_set(mode="OBJECT")
        bpy.ops.object.select_all(action='TOGGLE')

        i += 1

But frankly I would do it with for -loop and it wouldn't need i = 0 , i += 1 and selObj[i] but only item

    # --- for-loop ---

    # without `i = 0`

    for item in selObj:

        obj = bpy.context.window.scene.objects[0]
        bpy.context.view_layer.objects.active = obj
        bpy.ops.object.mode_set(mode="EDIT")
        bpy.ops.mesh.select_all(action='TOGGLE')
        bpy.ops.mesh.select_all(action='TOGGLE')

        # `item` instead of `selObj[i]`
        full_file_name = target_dir + bpy.data.objects[ item ].name
        dirname = os.path.dirname(full_file_name)

        # inside `while`-loop
        if not os.path.exists(dirname):
            os.makedirs(dirname)

        bpy.ops.uv.export_layout(filepath=full_file_name, mode='PNG', size=(4096, 4096), opacity=0.6)
        bpy.ops.object.mode_set(mode="OBJECT")
        bpy.ops.object.select_all(action='TOGGLE')

        # without `i += 1`