(self, sourcelines)
Given a list of linesep terminated strings constituting the lines of
        a single header, return the (name, value) tuple that should be stored
        in the model.  The input lines should retain their terminating linesep
        characters.  The lines passed in by the email package may contain
        surrogateescaped binary data.
Given a list of linesep terminated strings constituting the lines of
        a single header, return the (name, value) tuple that should be stored
        in the model.  The input lines should retain their terminating linesep
        characters.  The lines passed in by the email package may contain
        surrogateescaped binary data.
Given a list of linesep terminated strings constituting the lines of a single header return the ( name value ) tuple that should be stored in the model . The input lines should retain their terminating linesep characters . The lines passed in by the email package may contain surrogateescaped binary data .
def header_source_parse(self, sourcelines):
        """Given a list of linesep terminated strings constituting the lines of
        a single header, return the (name, value) tuple that should be stored
        in the model.  The input lines should retain their terminating linesep
        characters.  The lines passed in by the email package may contain
        surrogateescaped binary data.
        """
        raise NotImplementedError
def header_source_parse ( self , sourcelines ) : raise NotImplementedError