Nikolay Pavlov wrote:
2015-11-21 16:41 GMT+03:00 Damien <[email protected]>:
> > Hi list,
> >
> > Vim function `py{,3}eval()` cannot used with a void expression.
> > :call pyeval('None')
> > E859: Failed to convert returned python object to vim value
> >
> > This is expected?
> >
>
> Yes, of course. Pyeval is for getting result from Python expressions, for
> executing expressions for their side-effects there is `:python` and
> `:execute`. And VimL does not have `None` equivalent to convert Python
> `None` to it.
Well, it's possible that a Python function returns None in some
situations. Would be good to be able to handle that in a simple way.
We do have the problem that there is no equivalent of None. Perhaps the
simples is to use the string 'None'. Using something like zero is more
easily confused with a valid return value.
let result = pyeval(expression)
if result != 'None'
" do something with result
endif
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