Python OAuth2 - Return to_header() in alpha order without "oauth_body_hash"

oauth2.py

def to_header(self, realm=''):
        """Serialize as a header for an HTTPAuth request."""
        oauth_params = ((k, v) for k, v in self.items() 
                            if k.startswith('oauth_'))

        stringy_params = ((k, escape(str(v))) for k, v in oauth_params)

        abc_params = {}
        for k, v in stringy_params:
            if k == 'oauth_body_hash':
                continue
            abc_params[k] = v

        abc_keys = sorted(abc_params)

        header_params = ['%s="%s"' % (k, abc_params[k]) for k in abc_keys]
        #print header_params
        #print ', '.join(header_params)

        #header_params = ('%s="%s"' % (k, v) for k, v in stringy_params)
        params_header = ', '.join(header_params)
 
        auth_header = 'OAuth '
        if params_header:
            auth_header = "%s, %s" % (auth_header, params_header)
            auth_header = auth_header.replace('OAuth , ', 'OAuth ')
        print 'AH: ', auth_header
        return {'Authorization': auth_header}