Why is there not quiz on data science in sololearn?

Answer 1

It's a new course
In future, i hope data science quizzes Also available

Answer 2

It's not a course only about a programming language, but about doing statistics with python.

In here they chose python as the primary language. But in reality, you can use any language you want (R is very popular in this regard).

And so a challenge in such course wouldn't be possible.

Same goes for machine learning.