Python 文件上传小部件不工作，它没有在 jupyter notebook 中显示上传按钮

Question

我正在使用 IPython 文件上传小部件包上传文本文件，但在运行 upload() 函数后我看不到上传小部件按钮。在包库中，它要求启用“jupyter nbextension enable”，我已经启用它仍然无法正常工作。下面是我的代码输出:

import io
from IPython.display import display
import fileupload

上面代码的输出如下:

Requirement already satisfied: webencodings in /opt/conda/lib/python3.6/site-packages (from bleach-  
to date: /home/jovyan/.local/share/jupyter/nbextensions/fileupload/extension.js
Up to date: /home/jovyan/.local/share/jupyter/nbextensions/fileupload/widget.js
Up to date: /home/jovyan/.local/share/jupyter/nbextensions/fileupload/fileupload/widget.js
- Validating: OK

To initialize this nbextension in the browser every time the notebook (or other app) loads:

      jupyter nbextension enable fileupload --user --py

Enabling notebook extension fileupload/extension...
  - Validating: OK

在此输出之后，我在下一个单元格中使用了 Upload() 函数，代码如下:

def _upload():

_upload_widget = fileupload.FileUploadWidget()

def _cb(change):
    global file_contents
    decoded = io.StringIO(change['owner'].data.decode('utf-8'))
    filename = change['owner'].filename
    print('Uploaded `{}` ({:.2f} kB)'.format(
        filename, len(decoded.read()) / 2 **10))
    file_contents = decoded.getvalue()

_upload_widget.observe(_cb, names='data')
display(_upload_widget)

_upload()

在这段代码之后，小部件按钮应该会出现，但我看不到那个按钮。请帮助我了解我做错了什么？

谢谢!

Answer 1

完全关闭并重新打开笔记本解决了我的问题。在提交特定的 Coursera 项目期间，这发生在我身上。