code: def os_name():
      result = bjam.variable("OS")
      assert len(result) == 1
      return result[0]
  
file_path: turicreate/src/external/boost/boost_1_68_0/tools/build/src/util/utility.py
imports: import re
  import os
  import bjam
  from b2.exceptions import *
  from b2.util import is_iterable_typed
label_desc: Use image node_id 11 for calling a global function with example usage: os_name() and returns: result