In a class , called a generator outside the class ,but it didnt work, when you use a common function ,it works

calling_a_generator.py

# -*- coding: utf-8 -*-
"""
Created on Thu Aug 10 14:43:04 2017

@author: leoqu
"""

def dict_gen(curs):
    field_names = ['id','name']
    while True:
        if not curs: return
        for row in curs:
            print(row)
            yield dict(zip(field_names, row))
            curs.remove(row)

class result_set:
    def __init__(self,query=None):
        self.query = None
        self._result = []
    def _fetch_all(self):
        items = [(1,'name1'),(2,'name2')]
        # this won't work 
        for item in dict_gen(items):
            print(item)
            self._result += [item]
    def get_result(self):
        self._fetch_all
        print(self._result)

def print_result(items):
    result = []
    # this function will work
    for item in dict_gen(items):
        result += [item]
    print(result)
print('output of a method inside class')
new_result_set = result_set()
new_result_set.get_result()
print('output of a common function')
print_result([(1,'name1'),(2,'name2')])