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I am aware that you can either use an Autocommand or defining a key-binding in some ftplugin file.

However, once the key-binding is defined, it will stay, no matter the filetype.

However, imagine that I want the mapping nnoremap <F12> <cmd>echo "Hello" be valid only for python filetypes, how shall I do?

1 Answer 1

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how shall I do?

You shall read the relevant documentation, :help :map-buffer:

If the first argument to one of these commands is "<buffer>" the mapping will
be effective in the current buffer only.  Example:
        :map <buffer>  ,w  /[.,;]<CR>
Then you can map ",w" to something else in another buffer:
        :map <buffer>  ,w  /[#&!]<CR>

"But how do I get there if I don't know what to search for?" you might ask. Well, you get there by:

  1. figuring out that you need help with mapping,
  2. asking Vim for help with :help mapping,
  3. and looking around. The relevant section is only 200 lines in.

That is, if you missed the "ADDITIONALLY..." section in :help usr_40.

The solution, in short…

  1. Create ftplugin/python.vim (or after/ftplugin/python.vim if you want it to be sourced after the built-in one).
  2. Add nnoremap <buffer> <F12> <cmd>echo "Hello"<CR> to it.

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