Running Python code in Vim

Question

I am writing Python code using Vim  and every time I want to run my code  I type this inside Vim    w  python   This gets frustrating  so I was looking for a quicker method to run Python code inside Vim  Executing Python scripts from a terminal maybe  I am using Linux

User · Answer

You can use skywind3000 asyncrun vim as well  It is similar to what  FocusedWolf has listed

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The accepted answer works for me  on Linux   but I wanted this command to also save the buffer before running  so I modified it slightly   nnoremap  lt buffer gt   lt F9 gt   w  lt bar gt   exec   python  shellescape     1  lt cr gt    The  w  lt bar gt  saves the buffer THEN runs the code in it

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This  vimrc mapping needs Conque Shell  but it replicates Geany  and other X editors   behaviour    Press a key to execute Executes in gnome-terminal Waits for confirmation to exit Window closes automatically on exit   let dummy   conque term subprocess  gnome-terminal -e  bash -c   python     expand           answer     z      while     answer        q        do printf      nexited with code     press  q  to quit         read -n 1 answer  done

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I have this in my  vimrc file   imap  lt F5 gt   lt Esc gt  w lt CR gt   clear python   lt CR gt    When I m done editing a Python script  I just press  lt F5 gt   The script is saved and then executed in a blank screen

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Put your cursor in the code somewhere  Right click and choose one of the  Select  choices to highlight your code  Then press Ctrl   and you will see the new prompt   lt       Now type  python and see if that works   I just spend days trying to figure out the same problem    I used the coding   s  My name  print  s     After I pulled out all my hair  I finally got it right

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Plugin  jupyter-vim  So you can send lines   lt leader gt E   visual selection   lt leader gt e  to a running jupyter-client  the replacement of ipython     I prefer to separate editor and interpreter  each one in its shell   Imagine you send a bad input reading command

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If you want to quickly jump back through your  w commands  a cool thing is to type  w and then press your up arrow  It will only cycle through commands that start with w

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Keep in mind that you re able to repeat the last used command with     so that s all you d need to repeat are those two character    Or you could save the string w  python into one of the registers  like  a for example  and then hit   lt C-R gt a lt CR gt  to insert the contents of register a into the commandline and run it    Or you can do what I do and map  lt leader gt z to   python   lt CR gt  to run the current file

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I prefer Python output redirected to a new Vim window  and if that window is left open then update its content the next time you execute Python code with this function      Bind F5 to save file if modified and execute python script in a buffer  nnoremap  lt silent gt   lt F5 gt   call SaveAndExecutePython   lt CR gt  vnoremap  lt silent gt   lt F5 gt    lt C-u gt call SaveAndExecutePython   lt CR gt   function  SaveAndExecutePython         SOURCE  reusable window   https   github com fatih vim-go blob master autoload go ui vim        save and reload current file     silent execute  update   edit         get file path of current file     let s current buffer file path   expand           let s output buffer name    Python      let s output buffer filetype    output         reuse existing buffer window if it exists otherwise create a new one     if  exists  s buf nr       bufexists s buf nr          silent execute  botright new     s output buffer name         let s buf nr   bufnr          elseif bufwinnr s buf nr     -1         silent execute  botright new          silent execute s buf nr    buffer      elseif bufwinnr s buf nr     bufwinnr              silent execute bufwinnr s buf nr     wincmd w      endif      silent execute  setlocal filetype     s output buffer filetype     setlocal bufhidden delete     setlocal buftype nofile     setlocal noswapfile     setlocal nobuflisted     setlocal winfixheight     setlocal cursorline   make it easy to distinguish     setlocal nonumber     setlocal norelativenumber     setlocal showbreak           clear the buffer     setlocal noreadonly     setlocal modifiable      delete          add the console output     silent execute    python     shellescape s current buffer file path  1         resize window to content length       Note  This is annoying because if you print a lot of lines then your code buffer is forced to a height of one line every time you run this function              However without this line the buffer starts off as a default size and if you resize the buffer then it keeps that custom size after repeated runs of this function              But if you close the output buffer then it returns to using the default size when its recreated      execute  resize    line             make the buffer non modifiable     setlocal readonly     setlocal nomodifiable endfunction

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I have this on my  vimrc    map  lt F9 gt   w lt CR gt   python   lt CR gt     which saves the current buffer and execute the code with presing only Esc   F9

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Building on the previous answers  if you like to see the code while looking at its  output you could find  ter   terminal  command useful   autocmd Filetype python nnoremap  lt buffer gt   lt F5 gt   w lt CR gt  ter python2     lt CR gt  autocmd Filetype python nnoremap  lt buffer gt   lt F6 gt   w lt CR gt  vert ter python3     lt CR gt    Using vert in the second line runs the code in vertical split instead of horizontal   The negative of it is that if you don t close the split-window where the code ran you will have many splits after multiple runs  which doesn t happen in original python IDLE where the same output window is reused     I keep these lines inside  home user  vimrc

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If you don t want to see   exec python file py  printed each time  use this   nnoremap  lt F9 gt   echo system  python2      expand             lt cr gt  nnoremap  lt F10 gt   echo system  python3      expand             lt cr gt    It didn t mess up my powerline   vim-airline statusbar either

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How about adding an autocmd to your    vimrc-file  creating a mapping   autocmd FileType python map  lt buffer gt   lt F9 gt   w lt CR gt  exec   python3  shellescape     1  lt CR gt  autocmd FileType python imap  lt buffer gt   lt F9 gt   lt esc gt  w lt CR gt  exec   python3  shellescape     1  lt CR gt    then you could press  lt F9 gt  to execute the current buffer with python  Explanation     autocmd  command that Vim will execute automatically on  event   here  if you open a python file   i map  creates a keyboard shortcut to  lt F9 gt  in insert normal mode  lt buffer gt   If multiple buffers files are open  just use the active one  lt esc gt   leaving insert mode  w lt CR gt   saves your file    runs the following command in your shell  try   ls     is replaced by the filename of your active buffer  But since it can contain things like whitespace and other  bad  stuff it is better practise not to write  python    but use  shellescape  escape the special characters  The 1 means with a backslash   TL DR  The first line will work in normal mode and once you press  lt F9 gt  it first saves your file and then run the file with python  The second does the same thing  but leaves insert mode first

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Think about using shebang line  so you will be able to use it with still any language  not only Python   Adding shebang   Add this to first line of your script      usr bin env python3   or this  if you are using Python 2      usr bin env python2   Vim keymap   Add this to your    vimrc   nmap  lt F7 gt   w lt cr gt   clear    p  lt cr gt    Make file executable   Type in Vim     chmod  x     or in terminal   chmod  x script name py   Explanation   When F7 is pressed in normal mode  Vim will try to execute current file as bash script  Then bash interpreter will see shebang line and understand  that this file should be passed to Python  or any other programm if needed     Also you will be able to run your script from terminal using it s name     script name py   instead of this way  that will work too    python3 script name py

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A simple method would be to type   while in normal mode  and then press the up arrow key on the keyboard and press Enter  This will repeat the last typed commands on VIM

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Instead of putting the command mapping in your  vimrc  put the mapping in your    vim ftplugin python vim file  Windows  HOME vimfiles ftplugin python vim    If you don t have this file or directories  just make them   This way the key is only mapped when you open a  py file or any file with filetype python  since you ll only be running this command on Python scripts   For the actual mapping  I like to be able to edit in Vim while the script runs   Going off of  cazyas  answer  I have the following in my ftplugin python vim  Windows    noremap  lt F5 gt   lt Esc gt  w lt CR gt   START  B python   lt CR gt    This will run the current Python script in the background   For Linux just change it to this   noremap  lt F5 gt   lt Esc gt  w lt CR gt   python    amp  lt CR gt

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You can extends for any language with 1 keybinding with augroup command  for example   augroup rungroup     autocmd      autocmd BufRead BufNewFile   go nnoremap  lt F5 gt   exec   go run  shellescape     1  lt cr gt      autocmd BufRead BufNewFile   py nnoremap  lt F5 gt   exec   python  shellescape     1  lt cr gt  augroup END

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Go to your home directory  cd Open your  vimrc file with vim  vim  vimrc Add the next code to the file  nmap  lt F4 gt   lt Esc gt  w lt CR gt   clear python   lt CR gt   Save it and quit  ZZ  The next time you want to run your code  just press F4 in  quot normal mode quot   If you want to run your code in  quot insert mode quot   replace nmap with imap

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I use     filename py   python    That s what works for me

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For generic use  run python haskell ruby C      from vim based on the filetype   there s a nice plugin called vim-quickrun  It supports many programming languages by default  It is easily configurable  too  so one can define preferred behaviours for any filetype if needed  The github repo does not have a fancy readme  but it is well documented with the doc file

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run current python file to new buffer function  RunPython       let s current file   expand          enew silent execute    python     shellescape s current file  1      setlocal buftype nofile bufhidden wipe noswapfile nowrap     setlocal nobuflisted endfunction autocmd FileType python nnoremap  lt Leader gt c  call RunPython   lt CR gt

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Just go to normal mode by pressing  lt esc gt  and type     clear  python          Step by step explanation         allows you to run a terminal command      clear will empty your terminal screen        ends the first command  allowing you to introduce a second command      python will use python to run your script  it could be replaced with   ruby for example         concats the current filename  passing it as a parameter to the   python command

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