code: def swap(ls, i, j):
      """Swap the elements ls[i], ls[j]."""
      if i == j:
          return
      ls[i], ls[j] = ls[j], ls[i]
  
imports: from __future__ import absolute_import, division, print_function
  from hypothesis.internal.compat import array_or_list, hbytes, int_to_bytes, integer_types
label_desc: Use image node_id 5 for calling a global function with example usage: swap(ls, i, j) without return types