Cube is not created

Question

import bpy 
a=0
def in_5_seconds(): 
    a=1 
    print(a)
if a==1: 
    bpy.ops.mesh.primitive_cube_add(size=2, enter_editmode=False, location=(0, 0, 0))
bpy.app.timers.register(in_5_seconds, first_interval=5) 

I want to create a cube in 5 seconds.

I changed the value of a to 1 using the def command in the system console, but the cube is not created.

Please tell me a solution

Answer 1

Modal Timer Operator.

For original code, the operator will never be called. Putting a print in the if statement will show it is never run. If the if clause was true; operator would be called once, when the script is run or imported. It is not run again when the timer method is called after 5 seconds. Suggest googling (stackoverflow) "python variable scope". I imagine this is why @lemon edited, thinking it may be a pasting error.

However the @lemon edited script with indent wont work see: Context is incorrect when calling from a timer

Instead could use a modal timer operator, when a number of seconds has elapsed, call the add primitive cube operator and finish.

How to run a python script at regular intervals?

Edited version of Text Editor > Templates > Python > Operator Modal Timer

import bpy
from bpy.props import IntProperty
class ModalTimerOperator(bpy.types.Operator):
    """Operator which runs its self from a timer"""
    bl_idname = "wm.modal_timer_operator"
    bl_label = "Modal Timer Operator"
_timer = None

delay: IntProperty(
    name="Delay",
    default=10,
    )

def modal(self, context, event):
    if event.type == 'TIMER':

        if self._timer.time_duration >= self.delay:
            print(
                "Cube added after ",
                 self._timer.time_duration,
                 "secs")
            # remove timer
            self.cancel(context)
            # call the operator, return its status
            return bpy.ops.mesh.primitive_cube_add()

    return {'PASS_THROUGH'}

def execute(self, context):
    wm = context.window_manager
    self._timer = wm.event_timer_add(self.delay, window=context.window)
    wm.modal_handler_add(self)
    return {'RUNNING_MODAL'}

def cancel(self, context):
    wm = context.window_manager
    wm.event_timer_remove(self._timer)



def register():
    bpy.utils.register_class(ModalTimerOperator)
def unregister():
    bpy.utils.unregister_class(ModalTimerOperator)
if name == "main":
    register()
# test call
bpy.ops.wm.modal_timer_operator(delay=5)

Test run

Cube added after  5.001951217651367 secs