Thanks a lot! This solves my problem.
(I was sure to have tried a list as an argument and switched computers in 
between. This works on Ubuntu 18.04.)

John MacFarlane schrieb am Montag, 14. Dezember 2020 um 18:51:46 UTC+1:

>
> Should Emph perhaps take a list on inlines as argument?
>
> Emph([Str(value)])
>
> Stephan Boltzmann <stephan2...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > Which additional diagnostics could I run to pin down the problem with 
> the 
> > following filter:
> >
> > #!/usr/bin/env python
> > from pandocfilters import toJSONFilter, Str, Emph
> > def change(key, value, format, meta):
> > if format == 'odt':
> > if key == 'Str' and value == 'and':
> > return(Emph(Str(value)))
> > if __name__ == "__main__":
> > toJSONFilter(change)
> >
> > Using "pandoc -o text.odt --filter filter.py text.md" gives me the error 
> > message:
> >
> > Error running filter filter.py:
> > Error in $.blocks[0].c[2].c: expected [a], encountered Object
> >
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