Jupyter Notebook，Python:如何从函数内部调用魔术?

问题描述

我正在使用Jupyter Notebook，并试图基于Github上的模板创建小部件.

I am using the Jupyter Notebook, and am trying to create a widget, based on a template found on Github.

模板在某些时候使用了魔法%%javascript.直接粘贴到笔记本的单元格中，效果很好.

The template uses at some point the magic %%javascript. This works fine when directly pasted in the cells of the notebook.

但是，当我尝试使用小部件制作函数时，使用%%javascript表达式会使它返回错误:

However when I tried to make a function out of the widget, having the %%javascriptexpression makes it returns the error:

%%javascript SyntaxError: invalid syntax

任何人都知道如何转换"魔术命令，以便可以从函数内正确调用它(该函数保存在单独的文件中)

Anyone knows how to "convert" the magic command so that it can be invoked properly from within a function (the function is saved in a separate file)

推荐答案

如果使用内置的? IPython，则可以看到魔术的路径.例如，%%javascript?显示它在lib\site-packages\ipython\core\magics\display.py

If you use the ? IPython builtin, you can see the path for the magics. For example, %%javascript? shows that it is in lib\site-packages\ipython\core\magics\display.py

然后可以将其导入并作为标准使用.例如，如果您从笔记本计算机运行警报框，则会弹出以下对话框:

You can then just import it and use it as standard; for example, the following pops up an alert box if you run it from a notebook:

from IPython.core.magics.display import Javascript
Javascript('alert("hello world")')

要使您在注释中发布的示例正常工作，只需将要运行的Javascript括在引号中，然后使用Javascript进行调用.替换为In[4]会像往常一样弹出窗口，应该可以将其包含在普通的Python函数中.

To get the example you posted in the comments working, just wrap the Javascript you'd like to run in quotes and call it with Javascript. Replacing In[4] with this pops out the window as normal and should be fine to include in a normal Python function.

from IPython.core.magics.display import Javascript
Javascript("""$('div.inspector')
    .detach()
    .prependTo($('body'))
    .css({
        'z-index': 999,
        position: 'fixed',
        'box-shadow': '5px 5px 12px -3px black',
        opacity: 0.9
    })
    .draggable();""")

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