iPython 笔记本错误 - 笔记本 JSON 无效：u'execution_count' 是必需属性

Question

我在运行 iPython Notebook 时遇到以下错误，想知道是否有人可以提供帮助。

我曾尝试浏览以前的帖子，但找不到答案。笔记本最终在网络浏览器上运行，但错误不断出现。

控制台错误：

C:\Apps\Anaconda2\envs\simpleQT\python.exe
C:\Apps\Anaconda2\envs\simpleQT\Scripts\ipython-script.py notebook --no-browser --ip 127.0.0.1 --port 8888
[I 09:43:20.525 NotebookApp] The port 8888 is already in use, trying another random port.
[I 09:43:20.528 NotebookApp] Serving notebooks from local directory: C:\Users\Tanya.Sandoval\_QT\simpleQT
[I 09:43:20.528 NotebookApp] 0 active kernels 
[I 09:43:20.528 NotebookApp] The IPython Notebook is running at: http://127.0.0.1:8889/
[I 09:43:20.528 NotebookApp] Use Control-C to stop this server and shut down all kernels (twice to skip confirmation).
[E 09:43:37.553 NotebookApp] Notebook JSON is invalid: u'execution_count' is a required property

Failed validating u'required' in schema:
    {u'additionalProperties': False,
     u'description': u'Result of executing a code cell.',
     u'properties': {u'data': {u'$ref': u'#/definitions/misc/mimebundle'},
                     u'execution_count': {u'description': u"A result's prompt number.",
                                          u'minimum': 0,
                                          u'type': [u'integer', u'null']},
                     u'metadata': {u'$ref': u'#/definitions/misc/output_metadata'},
                     u'output_type': {u'description': u'Type of cell output.',
                                      u'enum': [u'execute_result']}},
     u'required': [u'output_type',
                   u'data',
                   u'metadata',
                   u'execution_count'],
     u'type': u'object'}

On instance:
    {u'data': {u'text/html': u'<div>\n<table border="1" class="dataframe">\n  <thead>\n    <tr style="text-align: right;">\n      <th></th>\n      <th>Open</th>\n      <th>High</th>\n      <th>Low</th>\n      <th>Close</th>\n      <th>Volume</th>\n    </tr>\n    <tr>\n      <th>Timestamp</th>\n      <th></th>\n      <th></th>\n      <th></th>\n      <th></th>\n      <th></th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>2009-01-02</th>\n      <td>15.90</td>\n      <td>15.95</td>\n      <td>15.30</td>\n      <td>15.55</td>\n      <td>1065</td>\n    </tr>\n    <tr>\n      <th>2009-01-05</th>\n      <td>15.94</td>\n      <td>15.94</td>\n      <td>15.32</td>\n      <td>15.38</td>\n      <td>3710</td>\n    </tr>\n    <tr>\n      <th>2009-01-06</th>\n      <td>15.60</td>\n      <td>15.90</td>\n      <td>15.43</td>\n      <td>15.69</td>\n      <td>4619</td>\n    </tr>\n    <tr>\n      <th>2009-01-07</th>\n      <td>15.75</td>\n      <td>16.04</td>\n      <td>15.40</td>\n      <td>15.45</td>\n      <td>5956</td>\n    </tr>\n    <tr>\n      <th>2009-01-08</th>\n      <td>15.40</td>\n      <td>15.45</td>\n      <td>14.49</td>\n      <td>14.76</td>\n      <td>8454</td>\n    </tr>\n    <tr>\n      <th>2009-01-09</th>\n      <td>14.60</td>\n      <td>14.80</td>\n      <td>14.40</td>\n      <td>14.44</td>\n      <td>6846</td>\n    </tr>\n    <tr>\n      <th>2009-01-12</th>\n      <td>14.40</td>\n      <td>14.40</td>\n      <td>13.70</td>\n      <td>13.94</td>\n      <td>10355</td>\n    </tr>\n    <tr>\n      <th>2009-01-13</th>\n      <td>13.30</td>\n      <td>14.05</td>\n      <td>13.30</td>\n      <td>13.78</td>\n      <td>11341</td>\n    </tr>\n    <tr>\n      <th>2009-01-14</th>\n      <td>13.90</td>\n      <td>14.25</td>\n      <td>13.20</td>\n      <td>13.28</td>\n      <td>11170</td>\n    </tr>\n    <tr>\n      <th>2009-01-15</th>\n      <td>13.17</td>\n      <td>13.64</td>\n      <td>13.07</td>\n      <td>13.25</td>\n      <td>9745</td>\n    </tr>\n  </tbody>\n</table>\n</div>'},
     u'metadata': {},
     u'output_type': u'execute_result'}
[W 09:43:37.565 NotebookApp] Notebook notebook.ipynb is not trusted
[I 09:43:38.515 NotebookApp] Kernel started: c8c37658-b072-4a1d-87c5-0f862f514e44

网络浏览器出错：

Notebook Validation failed: u'execution_count' is a required property:
{
 "output_type": "execute_result", 
 "data": {
  "text/html": "<div>\n<table border=\"1\" class=\"dataframe\">\n  <thead>\n    <tr style=\"text-align: right;\">\n      <th></th>\n      <th>Open</th>\n      <th>High</th>\n      <th>Low</th>\n      <th>Close</th>\n      <th>Volume</th>\n    </tr>\n    <tr>\n      <th>Timestamp</th>\n      <th></th>\n      <th></th>\n      <th></th>\n      <th></th>\n      <th></th>\n    </tr>\n  </thead>\n  <tbody>\n    <tr>\n      <th>2009-01-02</th>\n      <td>15.90</td>\n      <td>15.95</td>\n      <td>15.30</td>\n      <td>15.55</td>\n      <td>1065</td>\n    </tr>\n    <tr>\n      <th>2009-01-05</th>\n      <td>15.94</td>\n      <td>15.94</td>\n      <td>15.32</td>\n      <td>15.38</td>\n      <td>3710</td>\n    </tr>\n    <tr>\n      <th>2009-01-06</th>\n      <td>15.60</td>\n      <td>15.90</td>\n      <td>15.43</td>\n      <td>15.69</td>\n      <td>4619</td>\n    </tr>\n    <tr>\n      <th>2009-01-07</th>\n      <td>15.75</td>\n      <td>16.04</td>\n      <td>15.40</td>\n      <td>15.45</td>\n      <td>5956</td>\n    </tr>\n    <tr>\n      <th>2009-01-08</th>\n      <td>15.40</td>\n      <td>15.45</td>\n      <td>14.49</td>\n      <td>14.76</td>\n      <td>8454</td>\n    </tr>\n    <tr>\n      <th>2009-01-09</th>\n      <td>14.60</td>\n      <td>14.80</td>\n      <td>14.40</td>\n      <td>14.44</td>\n      <td>6846</td>\n    </tr>\n    <tr>\n      <th>2009-01-12</th>\n      <td>14.40</td>\n      <td>14.40</td>\n      <td>13.70</td>\n      <td>13.94</td>\n      <td>10355</td>\n    </tr>\n    <tr>\n      <th>2009-01-13</th>\n      <td>13.30</td>\n      <td>14.05</td>\n      <td>13.30</td>\n      <td>13.78</td>\n      <td>11341</td>\n    </tr>\n    <tr>\n      <th>2009-01-14</th>\n      <td>13.90</td>\n      <td>14.25</td>\n      <td>13.20</td>\n      <td>13.28</td>\n      <td>11170</td>\n    </tr>\n    <tr>\n      <th>2009-01-15</th>\n      <td>13.17</td>\n      <td>13.64</td>\n      <td>13.07</td>\n      <td>13.25</td>\n      <td>9745</td>\n    </tr>\n  </tbody>\n</table>\n</div>"
 }, 
 "metadata": {}
}

有什么想法吗？谢谢！

更新

实际上，这个错误只发生在我从 PyCharm 编辑器运行 jupyter/ipython notebook 时。如果我在网络浏览器上运行它，错误就会消失。看来 PyCharm 的笔记本兼容性仍然存在 bug...

Answer 1

在笔记本上使用 PyCharm 后我遇到了同样的问题。

我可以通过简单地重新启动内核、清除所有输出并保存笔记本来使错误在浏览器中消失。

通过转到内核菜单然后选择重新启动并清除输出来重新启动内核。请参阅屏幕截图以获取示例：

Answer 2

我今天在尝试编写一个对我的 ipython 脚本进行半自动编辑的脚本时遇到了同样的问题。

您可以在 python 中逐行读取文件，然后执行 str.replace('"execution_count": "null"', '"execution_count": null') 并将输出写入新文件。

然后您可以在 ipython notebook 中打开新文件。它为我解决了这个问题。毕竟，一个ipython notebook文件只是一个json文件（只不过是一堆嵌套的字典和列表而已）。

Answer 3

我在这个问题上浪费了相当多的时间。如果所有其他方法都失败了，请将单元格转换为 markdown（您可以在 Pycharm 中执行此操作），然后保存。

此时它应该在常规浏览器中打开，您可以将它们转换回代码。

如果您可以选择清除所有输出并保存，那会更容易（在我的情况下，这不是一个选项，甚至不会加载）。