self.calls = 0

        @pynvim.command('Cmd', range='', nargs='*', sync=True)
        def command_handler(self, args, range):
            self._increment_calls()
            self.vim.current.line = (
                'Command: Called %d times, args: %s, range: %s' % (self.calls,
                                                                   args,
                                                                   range))

        @pynvim.autocmd('BufEnter', pattern='*.py', eval='expand("<afile>")',
                        sync=True)
        def autocmd_handler(self, filename):
            self._increment_calls()
            self.vim.current.line = (
                'Autocmd: Called %s times, file: %s' % (self.calls, filename))

        @pynvim.function('Func')
        def function_handler(self, args):
            self._increment_calls()
            self.vim.current.line = (
                'Function: Called %d times, args: %s' % (self.calls, args))

        def _increment_calls(self):
            if self.calls == 5:
                raise Exception('Too many calls!')
            self.calls += 1
<

As can be seen, the plugin is implemented using idiomatic Python (classes,
methods, and decorators). The translation between these language-specific
idioms to Vimscript occurs while the plugin manifest is being generated (see
the next section).

Notice that the exported command and autocmd are defined with the "sync" flag,
which affects how Nvim calls the plugin: with "sync" the |rpcrequest()|
function is used, which will block Nvim until the handler function returns a
value. Without the "sync" flag, the call is made using a fire and forget
approach with |rpcnotify()|, meaning return values or exceptions raised in the
handler function are ignored.

To test the above plugin, it must be saved in "rplugin/python" in a
'runtimepath' directory (~/.config/nvim/rplugin/python/limit.py for example).
Then, the remote plugin manifest must be generated with
|:UpdateRemotePlugins|.

==============================================================================