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Emacs python mode indent

Emacs Stack Exchange is a question and answer site for those using, extending or developing Emacs. It only takes a minute to sign up. Working on. I also know how to get it to use the tab character by default.

I'd like to leave it at using spaces by default, but recognize when tab characters are used and use that instead for my older python files. I know I can just untabify everything, but this might not be an option when working on someone else's code and they'd like to use tabs instead for whatever reason.

In one file, that indent is using 4 spaces while the other file uses a tab character. I can't get Emacs to recognize the difference.

I am using Elpy, but I've tried this with Elpy disabled. I've also tried this with a blank init file and having only the modifications to tab. Anyone know the solution to this? Setting indent-tabs-mode to t makes it always use a tab character. Setting it to nil makes it always use spaces. I've also tried the following:. I feel kind of ridiculous for not having seen this before, but I found the answer on the EmacsWiki: No Tabs page under the "Smart inference of indentation style" section.

Putting that code in my init. Sign up to join this community. The best answers are voted up and rise to the top.

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Python mode indentation Ask Question. Asked 3 years, 9 months ago.

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Active 3 years, 8 months ago. Viewed 6k times. I've been messing around with the following: add-hook 'python-mode-hook lambda setq indent-tabs-mode t setq tab-width 4 Setting indent-tabs-mode to t makes it always use a tab character.

I've also tried the following: add-hook 'python-mode-hook 'guess-style-guess-tabs-mode add-hook 'python-mode-hook lambda guess-style-guess-tab-width This will only use spaces in Python files What do?

Improve this question. Andrew Lamarra. Andrew Lamarra Andrew Lamarra 1 1 silver badge 8 8 bronze badges.This is of course possible, but discouraged. Why make Emacs dumber than it is?

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Emacs can figure out how much indentation you need and do the right thing! Remember, often the indentation engines of major modes can be customized. Specially modes based on CC Mode are notorious for their support of styles. See IndentingC for examples. The variable indent-tabs-mode controls whether tabs are used for indentation.

It is t true by default; to deactivate it, put the following in. The rest of this page will assume tabs are used and discuss the use of the following two variables:. You should ensure these variables have the same value to avoid interoperability problems with other editors TextMate, for example that are unable to separate tab width from indentation. The following will merge the indentation offset and tab width variables for Emacs as well:.

With this set-up, all lines but continuation lines become independent of the tab size used by the programmer. To fix continuation lines too, see SmartTabs. There are no eight spaces in it to replace with a tab. If indent-tabs-mode is t and tab-width is 4, however, you will see three tabs looking four spaces wide:. If you are collaborating with other people, however, and they use different settings, things will get ugly. The tabs may look twice as wide, since the default is Thus, you should either not change tab-widthor make sure that it matches whatever the indentation steps of your current major mode are.

If you are a die-hard tab user, try using a tab-width of 2. If your. If other people are working on the same code, you might want to use EditorConfig and the emacs extension. Yesit is possible. See SmartTabs. Basic Control The variable indent-tabs-mode controls whether tabs are used for indentation. For Perl, it is controlled by cperl-indent-level. The following will merge the indentation offset and tab width variables for Emacs as well: setq tab-width 4 ; or any other preferred value defvaralias ' c-basic-offset 'tab-width defvaralias ' cperl-indent-level 'tab-width With this set-up, all lines but continuation lines become independent of the tab size used by the programmer.

The following two commands will be useful when looking at the examples below: M-x tabify : Change spaces to tabs where appropriate. M-x untabify : Change all tabs to the correct number of spaces controlled by tab-width. Rely on the indentation suggested by the Emacs major modes but see also Project-specific Indentation Configuration, below. Project-specific Indentation Configuration If your. Smart Tabs Is it possible to make Emacs use a smart mix of tabs and spaces?Join Stack Overflow to learn, share knowledge, and build your career.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've been unsuccessful in getting Emacs to switch from 8 space tabs to 4 space tabs when pressing the TAB in buffers with the major mode text-mode.

emacs python mode indent

I've added the following to my. No matter how I change my. As much as I love Emacs this is getting annoying. Is there a way to make Emacs to at least indent 4 space when there's not text in the previous line?

The key point is to tell emacs to insert whatever you want when indenting, this is done by changing the indent-line-function. It is easier to change it to insert a tab and then change tabs into 4 spaces than change it to insert 4 spaces.

The following configuration will solve your problem:. From Indentation Controlled by Major Mode emacs manual :. An important function of each major mode is to customize the key to indent properly for the language being edited. The indent-line-function variable is the function to be used by and various commands, like when calling indent-region to indent the current line. The command indent-according-to-mode does no more than call this function.

Just change the value of indent-line-function to the insert-tab function and configure tab insertion as 4 spaces. Its default value is changed to nil which means a tab stop every tab-width columns. It always pains me slightly seeing things like setq tab-stop-list 4 8 You'll see a screen where you can set all you indenting options and set them for the current session or save them for all future sessions.

If you do it this way you'll want to set up a customisations file. This problem isn't caused by missing tab stops; it's that emacs has a new? The TAB key is mapped to the method indent-for-tab-command, which calls whatever method the variable indent-line-function is set to, which is indent-relative method for text mode.

I havn't figured out a good way to override the indent-line-function variable text mode hook isn't working, so maybe it is getting reset after the mode-hooks run? If that's not what you're asking for, please describe the behavior you'd like to see. You can add these lines of code to your.Join Stack Overflow to learn, share knowledge, and build your career. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.

I am using emacs-for-python provided by gabrielelanaro at this link. It doesn't happen automatically when I create a class, function or any other block of code that requires automatic indentation if, for etc. Instead emacs says "Arithmetic Error".

It doesn't happen when I press Tab anywhere in a. Again, every Tab press causes "Arithmetic error". Also, when I manually indent code using spaces, I can't erase those spaces! Backspace-ing these indents also causes "Arithmetic Error". Check the value of python-indent-offset. Emacs tries to guess the offset used in a Python file when opening it.

It might get confused and set that variable to 0 for some badly-formatted Python file. If this is indeed the problem, please do file a bug report using M-x report-emacs-bug and the text of the Python file so that the auto-detection can be fixed. The quickest workaround which I found was too add Jorgens Answer into. Learn more.

Indentation not working properly in emacs for python Ask Question. Asked 6 years, 2 months ago. Active 5 years, 11 months ago. Viewed 10k times. Indentation doesn't seem to be working for me at all. This problem surfaces when I use the regular Python AC mode as well. Improve this question. Flame of udun Flame of udun 1, 5 5 gold badges 27 27 silver badges 66 66 bronze badges. Related to this issue maybe? Hard to say without knowing your configuration. I am new to emacs. What I meant was the other packages that you have installed - can you run emacs without any init.

Did the issue I linked help? I am not sure how to do that.This configuration is meant for users that prefer tabs over spaces. To learn how to customize tabs and spaces behavior differently, please refer to the Breaking It Down section. These are two different functions that we can easily call in our custom hooks. First thing we do in the enable-tabs function is set the TAB key to tab-to-tab-stop.

In my opinion, it is a more sane default. When you press the tab key, it will indent one tab as expected. There is no wizardry or confusion of what will happen next when you hit the tab key. After that, we enable indent-tabs-mode and set our custom tab-width.

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In this example, we enable tabs in prog-mode. Prog-mode is a nice hook to use if you want to make settings for pretty much all code filetypes. After that we disable tabs use spaces in Lisp and ELisp files. Why is that exactly? Remember not to define the variable custom-tab-width twice!

I included it in this code snippet just for illustration purposes. In this example, we set the the tab width to our custom tab width variable. The first line uses the basic tab-width property. I recommend not setting the tab-width in the way I have described above and instead put it inside of a function, to be used in hooks.

Detail on doing just that. Next, we set the Python indent size to our custom tab width variable. They make it 4 spaces by default to comply with pep8but if you prefer to have your own default value, you can change it via that variable. Lastly, we set the evil-shift-width to our custom tab width variable.

Emacs for Python, Customization

This is only useful if you are using the Evil package to get Vim-like keybindings instead of using glorious Emacs keybindings. Something that was driving me nuts was Emacs electric-indent indenting the previous line when I press enter. Luckily, I came across a fix one day.

To accomplish this, refer to my How to Indent a Selection in Emacs guide. Something that I feel that is very important to have in an editor is a way to identify spaces and tabs easily.Join Stack Overflow to learn, share knowledge, and build your career.

Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. In Emacs, how do you indent the whole block at once. I am not an experienced Emacs user, but just find it is the best tool for working through ssh.

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I am using Emacs on the command line Ubuntunot as a gui, if that makes any difference. If you are programming Python using Emacs, then you should probably be using python-mode. With python-mode, after marking the block of code. If you need to shift code by two levels of indention, or some arbitary amount you can prefix the command with an argument:. Also useful are the rectangle commands that operate on rectangles of text instead of lines of text.

C-x r o inserts blank space to fill the rectangular region effectively shifting code to the right.

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C-x r t prompts for a string to replace the rectangle with. With Ubuntu, to make python-mode the default mode for all. Mark a region as normal, then:.

None of the answers mentioned so far cover re-indentation of literals like dict or list. M-x indent-region or M-x python-indent-shift-right and company aren't going to help if you've cut-and-pasted the following literal and need it to be re-indented sensibly:. It feels like M-x indent-region should do something sensibly in python-modebut that's not yet the case. For the specific case where your literals are bracketed, using TAB on the lines in question gets what you want because whitespace doesn't play a role.

Or you can do C-u 10 C-x e to apply it 10 times. I know it doesn't sound like much, but try re-indenting lines of garbage literal without missing down-arrow, and then having to go up 5 lines and repeat things. I use the following snippet. On tab when the selection is inactive, it indents the current line as it normally does ; when the selection is inactive, it indents the whole region to the right. Copied from my post in: Indent several lines in Emacs.

Learn more. Emacs bulk indent for Python Ask Question. Asked 10 years, 9 months ago. Active 1 year, 4 months ago.

emacs python mode indent

Viewed 43k times. Improve this question. Vernon Vernon 2, 2 2 gold badges 22 22 silver badges 28 28 bronze badges. Active Oldest Votes. For example, after marking a rectangular region, C-x r o inserts blank space to fill the rectangular region effectively shifting code to the right C-x r k kills the rectangular region effectively shifting code to the left C-x r t prompts for a string to replace the rectangle with.

Improve this answer. Thanks that works perfectly. Glad it works for you. That makes me think perhaps all the commands listed above work the same for python-mode. If you run emacs -q to run emacs without loading an init file you'll see there is no binding for C-c C-l or C-c C-r in Python mode.

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Mark a region as normal, then: C-x r t string-rectangle : will prompt you for characters you'd like to insert into each line; great for inserting a certain number of spaces C-x r k kill-rectangle : remove a rectangle region; great for removing indentation You can also C-x r y yank-rectanglebut that's only rarely useful.See also: TurnAllIndentingOff.

Read it. This will only affect buffers opened after setting, not the ones already open.

Emacs 的 Python3 开发环境配置

Instead of just changing the basic offset, consider switching to a particular style. A style defines much more than just the basic offset. There are a number of predefined styles. This is how Emacs indents out of the box:.

emacs python mode indent

See Indent style article on Wikipedia with examples how different predefined C styles looks like. Emacs will tell you what semantic symbol it assigned to that code location and prompt you for a new indentation setting. Some options are. Casi allows you to tune the behavior of many keystrokes for every specified style in CC mode. This is useful for some cases, e. But Emacs can do better! Emacs can save it with TabsInsteadOfSpacesand on an ordinary editor the file will look as above, and still have Emacs show every tab as four spaces:.

This works because Emacs will indent something by four, and since a tab is four wide, Emacs will use a tab to do it. However, see SmartTabs for a better way to do this. For the opposite, see NoTabs. To use tabs for indentation and spaces for alignment, see SmartTabs.

Whenever you type certain characters, a newline will be inserted automatically. Some like it, some hate it. This maps newline-and-indent normally C-j to the return key. Note: In order to add this to your. It only works in version 5. More information in the source commentary and the GuessOffset topic. Or, if you prefer local file variables, then use a LocalVariables section in your source files. See also trick on CcMode currently to set the style according to the directory location.

Here is a summary:. To change the indentation of a line, we need to see which syntactic components affect the offset calculations for that line. This yields something like this:. This prompts you for the syntactic symbol to change, providing a reasonable default. After you hit return, CC Mode will then prompt you for the new offset value, with the old value as the default. Use the following symbols:.


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