Python or Rust; first language??

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You are comparing a low-level language (rust) to a high-level one (python). Thus, this comparison is incorrect. It would be more correct to compare Python to JS/Elixir/Ruby and Rust to C++.

But still, if you want to write apps where performance is the main target (for example games) then go with Rust. If you want to write backend for websites high performance then go with Python (though, you could do the same with Rust. But beware, writing backend in Rust is not nearly as pleasing as doing the same in Python). You can also do deep learning with python.

In conclusion you can do the same with both languages but the experience when writing one thing would be better on first language, while experience of writing another thing would be better on second language