comprehensions: Comprehensions in python are not just limited to lists. They can also be used on many data containers. Below is an example of a list-comprehension.
[c for i, c in enumerate('abceabce') if i < 5]
But there are also set comprehensions.
{c for i, c in enumerate('abceabce')}
And there are tuple comprehensions.
tuple(c for i, c in enumerate('abceabce'))
Even dictionary comprehensions!
{i: c for i, c in enumerate('abceabce') if i < 5}