(self, username)
This method checks if the supplied username already exists.
def check_username(self, username):
        '''

        This method checks if the supplied username already exists.

        '''

        # select dataset
        self.sql.connect(self.db_ml)
        sql_statement = 'SELECT * '\
            'FROM tbl_user '\
            'WHERE username=%s'
        args = (username)
        response = self.sql.execute('select', sql_statement, args)

        # retrieve any error(s)
        response_error = self.sql.get_errors()

        # return result
        if response_error:
            return {'error': response_error, 'result': None}
        else:
            return {'error': None, 'result': response['result']}
def check_username ( self , username ) : # select dataset self . sql . connect ( self . db_ml ) sql_statement = 'SELECT * ' 'FROM tbl_user ' 'WHERE username=%s' args = ( username ) response = self . sql . execute ( 'select' , sql_statement , args ) # retrieve any error(s) response_error = self . sql . get_errors ( ) # return result if response_error : return { 'error' : response_error , 'result' : None } else : return { 'error' : None , 'result' : response [ 'result' ] }