what does "vim:et:ts..." mean in vi?

Hi,

I'm reading someone's code and at the end of the file I found some
code like this:


#
###########################################################################­
#
#{{{ * Editor configuration
#
###########################################################################­
#
# Local Variables:
# mode: python
# mode: outline-minor
# outline-regexp: " *#{{{ [#*]+"
# indent-tabs-mode: nil
# End:
# vim:et:sw=4:ts=4:ft=python:


I'm interested those "vim:et:sw...." because I'm a user of vi, but I
don't know what these "comments" means and I guess they have some
special usage. Can anybody help me? thanks.

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