问题：在IPython / Jupyter笔记本中显示行号
在IPython / Jupyter Notebook中运行的大多数语言内核的错误报告都指出发生错误的行；但是（至少默认情况下）在笔记本电脑中没有显示行号。
是否可以将行号添加到IPython / Jupyter Notebook？
Error reports from most language kernels running in IPython/Jupyter Notebooks indicate the line on which the error occurred; but (at least by default) no line numbers are indicated in Notebooks.
Is it possibile to add the line numbers to IPython/Jupyter Notebooks?
回答 0
CTRL– ML在CodeMirror区域中切换行号。有关其他键盘快捷键，请参见快速帮助。
更详细地讲CTRL– M（或ESC）将您带入命令模式，然后L按键将切换当前单元格行号的可见性。在较新的笔记本电脑版本中，Shift-L应切换所有单元格。
如果您忘记了快捷方式，请调出命令面板Ctrl-Shift+P（Cmd+Shift+P在Mac上为Mac，然后搜索“行号”），它应该允许切换并显示快捷方式。
CTRL – ML toggles line numbers in the CodeMirror area. See the QuickHelp for other keyboard shortcuts.
In more details CTRL – M (or ESC) bring you to command mode, then pressing the L keys should toggle the visibility of current cell line numbers. In more recent notebook versions Shift-L should toggle for all cells.
If you can’t remember the shortcut, bring up the command palette Ctrl-Shift+P (Cmd+Shift+P on Mac), and search for “line numbers”), it should allow to toggle and show you the shortcut.
回答 1
在IPython 2.2.0上，只需在命令模式（通过键入Esc激活）中键入l（小写L）即可。有关其他快捷方式，请参见[帮助]-[键盘快捷方式]。
另外，您可以设置默认行为以通过编辑显示行号。custom.js
On IPython 2.2.0, just typing l (lowercase L) on command mode (activated by typing Esc) works. See [Help] – [Keyboard Shortcuts] for other shortcuts.
Also, you can set default behavior to display line numbers by editing custom.js.
回答 2
从View->中选择切换行号选项 Toggle Line Number。
Select the Toggle Line Number Option from the View -> Toggle Line Number.
回答 3
要在启动时默认打开所有单元中的行号，我建议使用此链接。我引用：
导航到jupyter配置目录，您可以通过在命令行中键入以下内容来找到该目录：
jupyter --config-dir
从那里打开或创建custom文件夹。
在该文件夹中，您应该找到一个custom.js文件。如果没有，则应该可以创建一个。在文本编辑器中将其打开并添加以下代码：
define([
'base/js/namespace',
'base/js/events'
],
function(IPython, events) {
events.on("app_initialized.NotebookApp",
function () {
IPython.Cell.options_default.cm_config.lineNumbers = true;
}
);
}
);
To turn line numbers on by default in all cells at startup I recommend this link. I quote:
Navigate to your jupyter config directory, which you can find by typing the following at the command line:
jupyter --config-dir
From there, open or create the custom folder.
In that folder, you should find a custom.js file. If there isn’t one, you should be able to create one. Open it in a text editor and
add this code:
define([
'base/js/namespace',
'base/js/events'
],
function(IPython, events) {
events.on("app_initialized.NotebookApp",
function () {
IPython.Cell.options_default.cm_config.lineNumbers = true;
}
);
}
);
回答 4
为了我， ctrl + m用于将网页另存为png，因此无法正常工作。但是我找到了另一种方式。
在工具栏上，有一个名为打开命令paletee的底部，您可以单击它并键入该行，并在此处看到切换单元格的行号。
For me, ctrl + m is used to save the webpage as png, so it does not work properly. But I find another way.
On the toolbar, there is a bottom named open the command paletee, you can click it and type in the line, and you can see the toggle cell line number here.
回答 5
这是了解活动快捷方式的方法（取决于您的操作系统和笔记本电脑的版本，它可能会更改）
Help > Keyboard Shortcuts > toggle line numbers
在运行ipython3的OSX上， ESC L
Here is how to know active shortcut (depending on your OS and notebook version, it might change)
Help > Keyboard Shortcuts > toggle line numbers
On OSX running ipython3 it was ESC L
回答 6
您还可以Toggle Line Numbers在View浏览器的Jupyter笔记本顶部工具栏上的下找到。这将添加/删除所有行号笔记本单元。
对我而言，Esc+ l仅添加/删除了活动单元格的行号。
You can also find Toggle Line Numbers under View on the top toolbar of the Jupyter notebook in your browser.
This adds/removes the lines numbers in all notebook cells.
For me, Esc+l only added/removed the line numbers of the active cell.
回答 7
正在寻找这个：Shift-L在JupyterLab 1.0.0中
Was looking for this: Shift-L in JupyterLab 1.0.0
回答 8
1.按esc进入命令模式2.按l（小写L）显示行号
1.press esc to enter the command mode
2.perss l(it L in lowcase) to show the line number
