code: def wait(n):
      import time
  
      time.sleep(n)
      return n
  
imports: import os
  import time
  from datetime import datetime
  import pytest
  from IPython.utils.io import capture_output
  import ipyparallel
  from ipyparallel import error
  from .clienttest import ClusterTestCase, raises_remote
label_desc: Use image node_id 1 for calling a global function with example usage: wait(n) and returns: n