If you’ve ever written any Python at all, the chances are you’ve used iterators without even realising it. Writing your own and using them in your programs can provide significant performance ...

1.1 How the for loop works internally: Initialization: When a for loop starts, Python first gets an iterator from the iterable. It does this by calling the iter() function on the iterable object.

Memory efficiency: (Due to) "Lazy evaluation" --- It only loads a single element pointed to the memory, one at a time. This is opposed to loading all elements within the collection into the memory at ...