I've been working in a strict wasm32-unknown-unknown environment, and I've been having a hard time with exceptions from the vm, as when you print them the string is not very useful at all. I just found vm.print_exception and it has actually useful information in it. This method works great if println works in you environment, but in the wasm32-unknown-unknown environment I'm in I can't use the println macro directly. It would be great if the RustPython errors had a method called something like to_readable_string or something that will do the same thing as vm.print_exception, but instead return the error so that it can be dealt with in other ways.