docs: def add_layer_from_py_file(self, filename):
          """This function implements loading a Python file and populating a new
          empty layer (Layer) with its contents
  
          :param filename: The name of a file to read
          :type filename: string
          """
          if filename.endswith('.py'):
              try:
                  path, filename = os.path.split(os.path.abspath(filename))
                  sys.path.append(path)
                  filename = filename.rsplit('.', 1)[0]
                  stack = __import__(filename, fromlist=['*'],)
              except ImportError:
                  logging.info("Could not import stack from %s" % filename)
                  return
  
              self.add_layer()
              for attribute in dir(stack):
                  setattr(self, attribute, getattr(stack, attribute))
              sys.path.pop()
              del sys.modules[filename]
              del stack