code: def select_requirements_file():
      """
      Print the path to a requirements file based on some os/arch condition.
      """
      if windows:
          print("requirements/win.txt")
      elif macosx:
          print("requirements/mac.txt")
      elif linux:
          if python2:
              print("requirements/linux-py2.txt")
          elif python3:
              print("requirements/linux-py3.txt")
      elif cygwin:
          print("requirements/cygwin.txt")
      else:
          raise Exception("Unsupported OS/platform")
  
imports: from __future__ import print_function
  import os
  import platform
  import struct
  import sys
label_desc: Use image node_id 1 for calling a global function with example usage: select_requirements_file() without return types