That's very interesting. I usually read once, sometimes don't even write code but I fully understand and ready to use the language. Maybe it's about the program

That's very interesting. I usually read once, sometimes don't even write code but I fully understand and ready to use the language. Maybe it's about the programming expertise level you already have. Of course, when reading stuff like Haskell, Scala you need to practice but when reading Python, Java... not for me.