The for loop construction in Python easily iterates over a collection of items. Here’s what you need to know to use it well.

First, you can’t just transport straight C for loops into Python. There has to be some concession to Python syntax. The initial attempt was clever but not clever enough.

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 perfo… ...