Change 8 spaces identation by default in vim by 4 spaces

To follow PEP-8 standar, for identation (tabs) it's recommended 4 spaces, not 8 as vim uses by default.
To change this value, just add these lines to your vimrc file (usually located in /etc/vim/vimrc).

filetype plugin indent on
" show existing tab with 4 spaces width
set tabstop=4
" when indenting with '>', use 4 spaces width
set shiftwidth=4
" On pressing tab, insert 4 spaces
set expandtab

if for some reason you need disable any command, just put an exclamation sign at the end of the command. For example:

To enable number lines, use: set number
To disable it, use: set number!

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