It's possible to create generator iterators using a comprehension-like syntax.
generator = (i * 2 for i in range(3)) next(generator) # 0 next(generator) # 2 next(generator) # 4 next(generator) # raises StopIteration
If a function doesn't necessarily need to be passed a list, you can save on characters (and improve readability) by placing a generator expression inside a function call. The parenthesis from the function call implicitly make your expression a generator expression.
sum(i ** 2 for i in range(4)) # 0^2 + 1^2 + 2^2 + 3^2 = 0 + 1 + 4 + 9 = 14
Additionally, you will save on memory because instead of loading the entire list you are iterating over (
[0, 1, 2, 3] in the above example), the generator allows Python to use values as needed.