2 Respuestas
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Challenges have been added over time, starting with C++ (I think). They require extra work by the developers of Sololearn since, even though they can probably reuse much of the existing code for other languages, at he very least they have to come up with some questions (and code them in the app).
Python may also get challenges someday, but I have no idea if they have already planned it or when they expect to add them.
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thank you