The field "TR.IndexConstituentWeightPercent" throws an error:
eikon.get_data('.SPX', ['TR.IndexConstituentRIC', 'TR.IndexConstituentWeightPercent'])
Retrieving only 'TR.IndexConstituentRIC' does work.
Also, the the Excel formula with TR.IndexConstituentWeightPercent does work:
=TR(".SPX","TR.IndexConstituentRIC;TR.IndexConstituentWeightPercent")
Any suggestions? Thanks!