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… ...

Remember that a CSV file is actually just a text document with a fancy formatting. That means that you actually don’t need to use a module if you want to know how to open CSV files in Python!

In Python-speak, a codec lets you convert different text encodings. However, you can do other things than text encoding conversion. This is closest in spirit to the C preprocessor method.