300             

   301 def find_in_path(name, path, default=None):

   302     '''find name in search path. path can be string (will be split

   303     with os.pathsep), or iterable thing that returns strings.  if name

   304     found, return path to name. else return default. name is looked up

   305     using cmd.exe rules, using PATHEXT.'''

   306     if isinstance(path, str):

   307         path = path.split(os.pathsep)

   308         

   309     pathext = os.environ.get('PATHEXT', '.COM;.EXE;.BAT;.CMD')

   310     pathext = pathext.lower().split(os.pathsep)

   311     isexec = os.path.splitext(name)[1].lower() in pathext

   312     

   313     for p in path:

   314         p_name = os.path.join(p, name)

   315         

   316         if isexec and os.path.exists(p_name):

   317             return p_name

   318         

   319         for ext in pathext:

   320             p_name_ext = p_name + ext

   321             if os.path.exists(p_name_ext):

   322                 return p_name_ext

   323             

   324     return default