code: def execute_only_once():
      
      f = inspect.currentframe().f_back
      ident = (f.f_code.co_filename, f.f_lineno)
      if ident in _EXECUTE_HISTORY:
          return False
      _EXECUTE_HISTORY.add(ident)
      return True
docs: Each called in the code to this function is guaranteed to return True the
      first time and False afterwards.
  
      Returns:
          bool: whether this is the first time this function gets called from this line of code.
  
      Example:
          .. code-block:: python
  
              if execute_only_once():
                  # do something only once