在运行所有期间选择在 ipython notebook 中运行哪些单元的简单方法 [英] Simple way to choose which cells to run in ipython notebook during run all

问题描述

我有一个 ipython 笔记本，它在数据处理例程中运行多个步骤，并在此过程中将信息保存在文件中.这样，在开发我的代码时(主要是在一个单独的 .py 模块中)，我可以跳到并运行各个步骤.我想设置它以便我可以 Cell->run all 但只让它执行某些可以轻松选择的选定步骤.例如，我想像这样定义我想在 dict 中运行的步骤:

I have an ipython notebook that runs several steps in a data processing routine and saves information in files along the way. This way, while developing my code (mostly in a separate .py module), I can skip to and run various steps. I'd like to set it up so that I can Cell->run all but only have it execute certain chosen steps that would be easily chosen. e.g., I'd envision defining the steps I want to run in a dict like so:

process = {
    'load files':False,
    'generate interactions list':False,
    'random walk':True,
    'dereference walk':True,
    'reduce walk':True,
    'generate output':True
}

然后这些步骤将根据这个 dict 运行.顺便说一句，每个步骤都包含多个单元格.

then the steps would run based on this dict. BTW, each step comprises multiple cells.

我认为 %macro 不是我想要的，因为任何时候我更改任何内容或重新启动内核时，我都必须重新定义宏，并更改单元格编号.

I think %macro is not quite what I want since anytime I changed anything or restarted the kernel I'd have to redefine the macro, with changing cell numbers.

是否有类似 %skip 或 %skipto 的魔法或类似的东西?或者也许是一种放在单元格开头的干净方法，if process[]: %dont_run_rest_of_cell?

Is there like a %skip or %skipto magic or something along those lines? Or perhaps a clean way to put at the beginning of cells, if process[<current step>]: %dont_run_rest_of_cell?

推荐答案

借助自定义内核扩展，您可以创建自己的跳过魔法.

You can create your own skip magic with the help of a custom kernel extension.

skip_kernel_extension.py

def skip(line, cell=None):
    '''Skips execution of the current line/cell if line evaluates to True.'''
    if eval(line):
        return

    get_ipython().ex(cell)

def load_ipython_extension(shell):
    '''Registers the skip magic when the extension loads.'''
    shell.register_magic_function(skip, 'line_cell')

def unload_ipython_extension(shell):
    '''Unregisters the skip magic when the extension unloads.'''
    del shell.magics_manager.magics['cell']['skip']

在您的笔记本中加载扩展程序:

Load the extension in your notebook:

%load_ext skip_kernel_extension

在要跳过的单元格中运行跳过魔术命令:

Run the skip magic command in the cells you want to skip:

%%skip True  #skips cell
%%skip False #won't skip

您可以使用变量来决定是否应使用 $ 跳过单元格:

You can use a variable to decide if a cell should be skipped by using $:

should_skip = True
%%skip $should_skip

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