Is there a better way to map command call based on filetype [duplicate]

Answer 1

if you have BufRead *.py, the autocommand was trigger only when it is loading a *.py buffer/file.

vim has filetype detection mechanism.

Vim can detect the type of file that is edited. This is done by checking the file name and sometimes by inspecting the contents of the file for specific text.

you should switch :filetype on

and use FileType event in your autocmd.