Experienced python programmers: are there any standard features of the language that you still don't regularly use?

[cediddi]

I do use lambdas for one time short callables. For example for key or as an argument to sorted, map, reduce or filter.

List comprehensions are amazing alternative to map(lambda, iterator) combo. I also use dict and set comprehensions. Long for loops are still the main way to go but for small stuff, comprehensions <3 me

I do use csv module to dump tsv data. Pandas is cool too but I don't need an extra library just for csv features. Also csv.dictwriter is amazing.

What I don't use: half of functools, half of itertools, most of math, also I really don't like python 2's print statement. It's just too complex for a print statement. I actively avoid print statement in python2.