code: def on_windows():
      """Returns true if running on windows, whether in cygwin or not."""
      if bjam.variable("NT"):
          return True
  
      elif bjam.variable("UNIX"):
          uname = bjam.variable("JAMUNAME")
          if uname and uname[0].startswith("CYGWIN"):
              return True
  
      return False
  
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 14 for calling a global function with example usage: on_windows() and returns: False, True, True