Get the attributes value with xPath

[vulturas]

Hello everyone,

I would like to get the value from the data-score attribute within the <span>-element.
<span class="index__stars__2ads4 index__large__1Ez3-" data-fillcolor="butterscotch" data-score="2.5"></span>

The following line returns an empty list:

score = tree.xpath('//span[@class="index__stars__2ads4 index__large__1Ez3-"]//data-score/text()')

What am I doing wrong here?

Greetings