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    Internals become important when you have to worry about performance. Commented Aug 8, 2013 at 19:47
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    I know a fair bit about CPython and PyPy internals, but 80% of the time they are of no use (or even harmful, as in distracting) for my Python programming. I'm glad I know that stuff the other 20% though, and it's not just for performance, also for understanding stupid error messages and steering clear of non-portable behaviour. Commented Aug 8, 2013 at 20:23
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    possible duplicate of What do you need to master a language and its technology? and At what point can I say I've “learned” a language? Commented Aug 8, 2013 at 21:36
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    Nope and nope. Definitely not a duplicate of either of those. Commented Aug 8, 2013 at 21:48
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    It depends what you mean by "the internals," but I know that it's not uncommon at all for professional C# and Java programmers to have at least some understanding of the CLI or JVM. Commented Aug 8, 2013 at 22:19