code: def exact_div(x: int, y: int, msg: Optional[str] = None) -> int:
      message = f"exact_div error, {x} is not evenly divisible by {y}"
      if msg:
          message += ", " + msg
      assert x % y == 0, message
      return x // y
  
imports: import time
  from typing import Optional
label_desc: Use image node_id 1 for calling a global function with example usage: exact_div(x, y, msg) and returns: unknown