Jupyter Notebook、Python:如何从函数内部调用魔法? [英] Jupyter Notebook, Python: How to call a magic from within a function?

问题描述

我正在使用 Jupyter Notebook，并尝试根据 Github 上的模板创建一个小部件.

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.这在直接粘贴到笔记本的单元格中时效果很好.

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

但是，当我尝试从小部件中创建一个函数时，使用 %%javascript 表达式使其返回错误:

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

%%javascript SyntaxError: 无效语法

任何人都知道如何转换"魔术命令，以便可以从函数内部正确调用它(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

如果你使用 ? IPython 内置，你可以看到魔法的路径.例如，%%javascript? 显示它在 libsite-packagesipythoncoremagicsdisplay.py

If you use the ? IPython builtin, you can see the path for the magics. For example, %%javascript? shows that it is in libsite-packagesipythoncoremagicsdisplay.py

然后您可以将其导入并作为标准使用；例如，如果你从笔记本运行它，下面会弹出一个警告框:

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")')

要使您在评论中发布的示例正常工作，只需将要运行的 Javascript 括在引号中并使用 Javascript 调用即可.用这个替换 In[4] 会像往常一样弹出窗口，应该可以包含在普通的 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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