How do I block comment in Jupyter notebook

Question

I want to comment out a block of multiple lines in Jupyter  Notebook  but can t find out how to do that in this current version  It used to be in one of the drop down menus but is no longer there  How do you comment out multi-line blocks of code at once  This is not a duplicate because the solution given in the following link doesn t seem to work anymore  How can I block comment code in the IPython notebook  Ctrl     does nothing

User · Answer

After searching for a while I have found a solution to comment on an AZERTY mac  The shortcut is Ctrl     key

User · Answer

On MacOS 10 11 with Firefox and a German keyboard layout it is Ctrl

User · Answer

Select the lines you want  to comment out  Then press   Ctrl

User · Answer

For a Dutch keyboard layout  on Debian 9 in Chromium 57  it is Ctrl

User · Answer

I add the same situation and went in a couple of stackoverfow  github and tutorials showing complex solutions  Nothing simple though  Some with  Hold the alt key and move the mouse while the cursor shows a cross  which is not for laptop users  at least for me   some others with configuration files     I found it after a good sleep night  My environment is laptop  ubuntu and Jupyter Ipython 5 1 0    Just select highlight one line  a block or something  and then  Ctrl      and it s magic

User · Answer

TL DR   Using MacBook Pro with Spanish - ISO Keyboard   Solution  Ctrl   -  Full story  This is an old post but reading it got me thinking about possible shortcuts   My keyboard is a Latin Apple MacBook Pro  which is called Spanish - ISO  I tried the changing keyboard distribution to U S  solution    this works but with this solution I have to switch keyboards every time I want to comment which    sucks   So I tried ctrl   - and it works  The - is where the   is located in an english keyboard but doing Cmd   - only changes the Chrome s zoom so I tried Ctrl which isn t as used as Cmd in macOS   My takeaway with this would be  if I have more shortcut problems I might try the original shortcut but using the key where the U S  keyboard would have it

User · Answer

Another thing to add  in the version I m using  the code has to be initialized in order to be to comment it out using CTRL and     If you haven t ran the code and the code isn t colorized it wont work

User · Answer

Quick Addition to Top Answer  CTRL     is nice because it toggles back and forth between adding and removing   at beginning of all selected lines  Didn t see that exact nuance mentioned so just wanted to add it here   This worked in Firefox Developer Edition 54 0b12 on Windows 7

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I tried this on Mac OSX with Chrome 42 0 2311 90  64-bit  and this works by using CMD       The version of the notebook server is 3 1 0-cbccb68 and is running on  Python 2 7 9  Anaconda 2 1 0  x86 64    default  Dec 15 2014  10 37 34    GCC 4 2 1  Apple Inc  build 5577     Could it be a browser related problem  Did you try Firefox or IE

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On a Finnish keyboard use Ctrl     to comment on multiple lines and use the same keys to de-comment   Ubuntu 14 04 Google Chrome

User · Answer

I am using chrome  Linux Mint  and for commenting and dis-commenting bundle of lines      Ctrl

User · Answer

Ctrl     works for me in Chrome browser in MS Windows  On a Mac  use Cmd      thanks Anton K      Please note  if   did not work out of the box  try pressing the   key on the Numpad  Credit   DreamFlasher in comments to this question

User · Answer

Try using the   from the numeric keyboard   Ctrl     in Chrome wasn t working for me  but when I used the   division symbol  from the numeric it worked

User · Answer

Fn   Cmd     in Safari browser on MacOS

User · Answer

Select the lines on windows jupyter notebook and then hit Ctrl

User · Answer

If you have a Mac and not a English keyboard  Cmd-  is still easy to produce    Follow the below steps    Just go into the Mac s System Settings  Keyboard  tab  Input Sources  or whatever it might be called in English Add the one for English  shows up as ABC  strange way to spell English      Whenever you want a Cmd-   you have to change to the ABC keyboard  in your menu row at the top of your screen if you have ticked it to be shown there in the System Settings - Keyboard tab    Cmd and the key to the left of the right  shift key  gives you Cmd-    P S  Don t forget to switch back to your normal keyboard

User · Answer

Use triple single quotes     at the beginning and end   It will be ignored as a doc string within the function         This is how you would write multiple lines of code in Jupyter notebooks        I can t figure out how to print that in multiple lines but you can add a line anywhere in between those quotes and your code will be fine

User · Answer

I have not yet managed to find the best way possible  Since I am using a keyboard with Finnish layout  some of the answers do not work for me  e g  user5036413 s answer    However  in the meantime  I have come up with a solution that at least helps me not to comment each and every line one by one  I am using Chrome browser in MS Windows and I have not checked other possibilities though   The solution  It uses the fact that you can have multiple line cursors in an Ipython Notebook   Press the Alt button and keep holding it  The cursor should change its shape into a big plus sign  The next step is  using your mouse  to point to the beginning of the first line you want to comment and while holding the Alt button pull down your mouse until the last line you want to comment  Finally  you can release the Alt button and then use the   character to comment  Voila  You have now commented multiple lines

[jupyter-notebook] How do I block comment in Jupyter notebook?

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