def __init__(self, element_type=None, length=None, content=b''):
        """Create a HelloElemHeader with the optional parameters below.

        Args:
            element_type: One of OFPHET_*.
            length: Length in bytes of the element, including this header,
                excluding padding.
        """
        super().__init__()
        self.element_type = element_type
        self.length = length
        self.content = content
def __init__ ( self , element_type = None , length = None , content = b'' ) : super ( ) . __init__ ( ) self . element_type = element_type self . length = length self . content = content
Create a HelloElemHeader with the optional parameters below.

        Args:
            element_type: One of OFPHET_*.
            length: Length in bytes of the element, including this header,
                excluding padding.