内核重启后如何重新加载jupyter笔记本? [英] How to reload a jupyter notebook after a kernel restart?

问题描述

在jupyter笔记本中，我想在python中定义一个函数，该函数在被调用时会执行以下操作:

In a jupyter notebook I would like to define a function in python, which, when called, does the following:

• 向用户发出警报
• 重新启动笔记本内核
• 将已执行的单元格标记为已完成(即，没有星号的[ ])
• 焦点在下一个单元格上

• Gives out an alert to the user
• Restarts the notebook kernel
• Marks the executed cell as done (i.e. without a star, [ ])
• Focus is on the next cell

或者作为替代:

• 向用户发出警报
• 重新启动笔记本内核
• 清除整个笔记本的所有输出
• 焦点再次位于第一个单元格上(就像浏览器选项卡的F5重新加载一样).

我尝试了以下代码

from IPython.display import display, HTML

def reload():
    display(HTML(
        '''
            <script>
                alert('This notebook needs to be restarted!');

                IPython.notebook.kernel.restart(); 
                IPython.display.clear_output();

                window.location.reload();

            </script>            
        '''
    ))
reload()

但出现错误

AttributeError: 'function' object has no attribute 'clear_output'

尽管此文档.

删除行时

IPython.display.clear_output();

然后重新启动内核，但是我收到2(！)警报，看起来好像执行了下一个单元格.另外，未清除单元格，当前单元格的括号([*])中仍带有星号.

then the kernel is restarted, but I get 2(!) alerts and it looks like that the execution of the next cell is performed. Also, the cells are not cleared , the current cell still does have the star in the brackets ([*]).

如何正确执行?

推荐答案

此代码实现了您所描述的替代选项，另外在重新加载之前保存了检查点，从而使输出保持清除状态:

This code does what you described as the alternative option, with the addition of saving a checkpoint before reloading so the output stays cleared:

from IPython.display import Javascript, display


def reload():
    display(
        Javascript('''
            // clear all output (based on: https://stackoverflow.com/a/47315713/9504155)           
            // save a reference to the cell we're currently executing inside of,
            // to avoid clearing it later (which would remove this js)
            var this_cell = $(element).closest('.cell').data('cell');
            function clear_other_cells () {
                Jupyter.notebook.get_cells().forEach(function (cell) {
                    if (cell.cell_type === 'code' && cell !== this_cell) {
                        cell.clear_output();
                    }
                    Jupyter.notebook.set_dirty(true);
                });
            }

            if (Jupyter.notebook._fully_loaded) {
                // notebook has already been fully loaded, so clear now
                clear_other_cells();
            }

            // save checkpoint so output stays cleared after reload
            IPython.notebook.save_checkpoint();

            IPython.notebook.kernel.restart();

            alert('This notebook needs to be restarted!');
            window.location.reload(false);
        '''))

reload()

如果您喜欢第一个选项(无需重新加载页面，而是专注于下一个单元格)，只需删除用于保存检查点并重新加载的行，并在JavaScript部分之后使用IPython.display.clear_output()函数将当前单元格的输出清除为好吧:

If you prefer the first option (without reloading the page, focusing on the next cell instead) just remove the lines for saving a checkpoint and reloading and use the IPython.display.clear_output() function after the JavaScript part to clear the current cell's output as well:

from IPython.display import Javascript, clear_output, display


def reload():
    display(
        Javascript('''
            // clear all output (based on: https://stackoverflow.com/a/47315713/9504155)           
            // save a reference to the cell we're currently executing inside of,
            // to avoid clearing it later (which would remove this js)
            var this_cell = $(element).closest('.cell').data('cell');
            function clear_other_cells () {
                Jupyter.notebook.get_cells().forEach(function (cell) {
                    if (cell.cell_type === 'code' && cell !== this_cell) {
                        cell.clear_output();
                    }
                    Jupyter.notebook.set_dirty(true);
                });
            }

            if (Jupyter.notebook._fully_loaded) {
                // notebook has already been fully loaded, so clear now
                clear_other_cells();
            }

            IPython.notebook.kernel.restart();

            alert('Notebook output cleared!');
        '''))
    clear_output()

IPython.display.clear_output();在您的代码中不起作用，因为它在HTML <script>标记中作为JavaScript代码而不是在Python中被调用.

IPython.display.clear_output(); was not working in your code because it was called in the HTML <script> tag as JavaScript code instead of in Python.

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