def find_command(cmd, paths=None, pathext=None):
 if (paths is None):
  paths = os.environ.get('PATH', '').split(os.pathsep)
 if isinstance(paths, string_types):
  paths = [paths]
 if (pathext is None):
  pathext = get_pathext()
 pathext = [ext for ext in pathext.lower().split(os.pathsep) if len(ext)]
 if (os.path.splitext(cmd)[1].lower() in pathext):
  pathext = ['']
 for path in paths:
  cmd_path = os.path.join(path, cmd)
  for ext in pathext:
   cmd_path_ext = (cmd_path + ext)
   if os.path.isfile(cmd_path_ext):
    return cmd_path_ext
  if os.path.isfile(cmd_path):
   return cmd_path
 raise BadCommand(('Cannot find command %r' % cmd))

def find_command ( cmd , paths = None , pathext = None ) : if ( paths is None ) : paths = os . environ . get ( 'PATH' , '' ) . split ( os . pathsep ) if isinstance ( paths , string_types ) : paths = [ paths ] if ( pathext is None ) : pathext = get_pathext ( ) pathext = [ ext for ext in pathext . lower ( ) . split ( os . pathsep ) if len ( ext ) ] if ( os . path . splitext ( cmd ) [ 1 ] . lower ( ) in pathext ) : pathext = [ '' ] for path in paths : cmd_path = os . path . join ( path , cmd ) for ext in pathext : cmd_path_ext = ( cmd_path + ext ) if os . path . isfile ( cmd_path_ext ) : return cmd_path_ext if os . path . isfile ( cmd_path ) : return cmd_path raise BadCommand ( ( 'Cannot find command %r' % cmd ) )
try to find a command in the path .