Sure, but we're talking (with the problem at hand) about Python standard libraries that get shipped with the Python distribution and not some NPM or pip univers

Sure, but we're talking (with the problem at hand) about Python standard libraries that get shipped with the Python distribution and not some NPM or pip universe. For instance the "os" module has an "urandom" function that does essentially the same as the "dd" in the bash script. Of course you could also read from the device so you wouldn't need to import "os". You would need to import "random" to get access to the random number generator, though, but it's still part of the standard library.