old_contents: from __future__ import absolute_import
  
  from typing import Any, Dict, List
  
  
  def add_dictlist(di, key, val):  # type: (Dict, Any, Any) -> None
      if key not in di:
          di[key] = []
      di[key].append(val)
  
  
  def aslist(l):  # type: (Any) -> List
      """Convenience function to wrap single items and lists, and return lists unchanged."""
  
      if isinstance(l, list):
          return l
      else:
          return [l]
  
  # http://rightfootin.blogspot.com/2006/09/more-on-python-flatten.html
  
  def flatten(l, ltypes=(list, tuple)):
      # type: (Any, Any) -> Any
      if l is None:
          return []
      if not isinstance(l, ltypes):
          return [l]
  
      ltype = type(l)
      l = list(l)
      i = 0
      while i < len(l):
          while isinstance(l[i], ltypes):
              if not l[i]:
                  l.pop(i)
                  i -= 1
                  break
              else:
                  l[i:i + 1] = l[i]
          i += 1
      return ltype(l)
  
new_contents: from __future__ import absolute_import
  
  from typing import Any, Dict, List
  
  
  def add_dictlist(di, key, val):  # type: (Dict, Any, Any) -> None
      if key not in di:
          di[key] = []
      di[key].append(val)
  
  
  def aslist(l):  # type: (Any) -> List
      """Convenience function to wrap single items and lists, and return lists unchanged."""
  
      if isinstance(l, list):
          return l
      else:
          return [l]
  
  # http://rightfootin.blogspot.com/2006/09/more-on-python-flatten.html
  
  def flatten(l, ltypes=(list, tuple)):
      # type: (Any, Any) -> Any
      if l is None:
          return []
      if not isinstance(l, ltypes):
          return [l]
  
      ltype = type(l)
      l = list(l)
      i = 0
      while i < len(l):
          while isinstance(l[i], ltypes):
              if not l[i]:
                  l.pop(i)
                  i -= 1
                  break
              else:
                  l[i:i + 1] = l[i]
          i += 1
      return ltype(l)
  
  # Check if we are on windows OS
  def onWindows():
      # type: () -> (bool)
      return os.name == 'nt'
  
subject: add onWindows() function