> If you happen to learn everything about protocols, the interpreter gotchas, there is the standard library which is also huge, and if you got everything in it, there is the ecosystem, which is so large nobody can know about every package.

I don't think the library and packages are part of the language though. Just like there is a 'C' without a standard library there is Python 'the language'.

As for the 90%, 90% of the code you write is boring and simple. The one thing I really missed in the slides was list comprehensions, presumably they are in the '10%', but I use them all the time.