In the following example, we loop through a list of numbers, and use the variable digit to hold each number in turn: Strings in Python are considered “sequences” — they can be iterated over ...

If you’ve ever written any Python at all, the chances are you ... but will all automatically play nicely if you try and loop over them in any way because they return an iterator on themselves.

Loops in Python over NumPy arrays can be optimized automatically this way. But Numba’s optimizations are only automatic up to a point, and may not manifest significant performance improvements ...