Hacker News Reader

Comment by versteegen | Hacker News Reader

You forgot the walrus operator!

  accum = initial
  series = [accum := bifun(accum, value) for value in seq]
  # result = series[-1]

To be honest, this is the first time I've used the walrus operator.

This is very nice. Replaces reduce() for me. Now to upgrade to Python 3.8! (stock Python on my cloud machine is still 3.7)

All hail the walrus!

(Seriously, I like that.)

doesn't it use a lot of memory since we're only interested in the last value?

You can do the same thing with a generator.

    x = 0
    deque((x := x + 1 for _ in range(10)), maxlen=0)
    print(x)
    >> 10

Using deque to consume generators is an old trick documented in the itertools recipes: https://docs.python.org/3/library/itertools.html#itertools-r...