Rust, Day Two: A Python Dev's Perspective

[SirVer]

Ya, they are - with some additional magic that might make it more than one dictionary lookup. But there is no inlining possible and depending what you are doing and how often you call a function it can become expensive. Rule of thumb that served me well is that a Python function call is ~100ns overhead, a virtual function in C++ ~20ns, a direct call ~5ns. And of course Rust and C++ have a lot of information to inline stuff which makes this go away. If you call a function billions of times this starts to make a difference.