code: def wait(n):
      time.sleep(n)  # noqa: F821
      return n
  
file_path: ipyparallel/ipyparallel/tests/test_dependency.py
imports: import ipyparallel
  from ipyparallel.serialize import can, uncan
  from ipyparallel.util import interactive
  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