Question

我的任务是将一些代码从python 2.7更新到python 3.6

目前代码中断了：

TypeError：'map'对象不可订阅

原始代码：

def test_create_page(self):
    """Ensure we can make a page"""

    response = DispatchTestHelpers.create_page(self.client)

    id = response.data['id']

    self.assertEqual(response.status_code, status.HTTP_201_CREATED)

    try:
        page = Page.objects.get(pk=response.data['id'])
    except Page.DoesNotExist:
        self.fail('The page should exist in the database')

    print()
    print()
    print(response.data)
    print()
    print()
    # Check Data
    self.assertEqual(response.data['title'], 'Test Page')
    self.assertEqual(response.data['slug'], 'test-page')
    self.assertEqual(response.data['snippet'], 'This is a test snippet')
    self.assertEqual(response.data['content'][0]['type'], 'paragraph')
    self.assertEqual(response.data['content'][0]['data'], 'This is some paragraph text')

原始输出：

======================================================================
ERROR: test_create_page (dispatch.tests.test_api_pages.PagesTest)
Ensure we can make a page
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/icenine/code/ubyssey- 
dev3/dispatch/dispatch/tests/test_api_pages.py", line 67, in 
test_create_page
    self.assertEqual(response.data['content'][0]['type'], 'paragraph')
TypeError: 'map' object is not subscriptable

到目前为止，我已经通过将地图对象转换为列表来解决了这个问题，但是这会返回一个空列表。据我所知，地图对象在被列为列表之前没有被任何方式触及，如https://stackoverflow.com/a/45018536/6448060所述。

从以下函数返回字典：

@classmethod
def create_page(cls, client, title='Test Page', slug='test-page'):
    """Create dummy page"""

    url = reverse('api-pages-list')

    data = {
      'title': title,
      'slug': slug,
      'snippet': 'This is a test snippet',
      'content': [
        {
          'type': 'paragraph',
          'data': 'This is some paragraph text'
        }
      ]
    }

    return client.post(url, data, format='json')

尝试解决方案：

def test_create_page(self):
    """Ensure we can make a page"""
    response = DispatchTestHelpers.create_page(self.client)

    id = response.data['id']

    self.assertEqual(response.status_code, status.HTTP_201_CREATED)

    try:
        page = Page.objects.get(pk=response.data['id'])
    except Page.DoesNotExist:
        self.fail('The page should exist in the database')

    data_list = list(response.data['content'])

    print()
    print(response.data)
    print()
    print(data_list)
    print()

    # Check Data
    self.assertEqual(response.data['title'], 'Test Page')
    self.assertEqual(response.data['slug'], 'test-page')
    self.assertEqual(response.data['snippet'], 'This is a test snippet')
    self.assertEqual(data_list[0]['type'], 'paragraph')
    self.assertEqual(data_list[0]['data'], 'This is some paragraph text')

尝试解决方案输出：

{'id': 1, 'slug': 'test-page', 'title': 'Test Page', 'featured_image': None, 'snippet': 'This is a test snippet', 'content': <map object at 0x7ff15f04e048>, 'published_at': None, 'is_published': False, 'published_version': None, 'current_version': 1, 'latest_version': 1, 'preview_id': '8720814f-a5e8-4892-b592-8cbb4d0d019f', 'template': OrderedDict([('id', 'default'), ('name', 'Default')]), 'template_data': {}, 'seo_keyword': None, 'seo_description': None}
[]
======================================================================
ERROR: test_create_page (dispatch.tests.test_api_pages.PagesTest) 
Ensure we can make a page
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/icenine/code/ubyssey- 
  dev3/dispatch/dispatch/tests/test_api_pages.py", line 77, in 
test_create_page
  self.assertEqual(data_list[0]['type'], 'paragraph')
IndexError: list index out of range

正如您在第一行中看到的那样，'content'键的值是一个地图对象。

如何从返回的字典中访问列表值？

Answer 1

response.data['content'][0]['type']

我认为response.data['content']不是列表，因此尝试访问其第0个元素失败。

'content': <map object at 0x7ff15f04e048>,

查找该map对象的文档;它可能在你用来实际点击你的URL的库的文档中。

Answer 2

所以问题出现在几个与django相关的模块文件中。有几个函数返回了地图类型，一个用于转换随地图返回的json数据。我用这样的列表包装了返回的地图

return list(map(<whatever is being mapped>))

现在的问题似乎已经解决了。

在python 3中返回带有列表值的字典

2 个答案: