code: def system():
      """Returns the system/OS name, e.g. 'Linux', 'Windows' or 'Java'.
  
      An empty string is returned if the value cannot be determined.
  
      """
      return uname().system
  
imports: import collections
  import os
  import re
  import sys
  import functools
  import itertools
label_desc: Use image node_id 21 for calling a global function with example usage: system() and returns: uname