Babies take at least ten to fifteen years to become truly proficient with a language and that includes a lot of formal learning. Once a first language has been acquired the process of learning becomes much easier.
Examples are very good, though. The Python documentation is usually very good at this. Examples often lead the sections with the exact details following.
I think that's a pretty high bar to say someone is proficient with a language. Children as young as 1-2 can effectively communicate their thoughts and feelings with others. I would speculate there are many functional adults with language skills not much better than a typical 10-15 year old.
Babies take at least ten to fifteen years to become truly proficient with a language and that includes a lot of formal learning. Once a first language has been acquired the process of learning becomes much easier.
Examples are very good, though. The Python documentation is usually very good at this. Examples often lead the sections with the exact details following.