ericmoritz

    from itertools import imap
    map(f, imap(g, imap(h, someList)))

    from itertools import ifilter
    # ugly python function with a "Maybe dict" return type
    def query(data, date):
        """Return the first dict where date is > x['date'] or None"""
        is_greater = lambda x: date > x['date']
        return next(
           ifilter(
               is_greater,
               data
           ),
           None
        )

    from numpy import arange

    def squares_numpy(n):
        a = arange(n)
        return a * a

    $ python -m timeit -s "from squares import squares_append" "squares_append(1000)"
    10000 loops, best of 3: 130 usec per loop
    $ python -m timeit -s "from squares import squares_comprehension" "squares_comprehension(1000)"
    10000 loops, best of 3: 95.4 usec per loop
    $ python -m timeit -s "from squares import squares_numpy" "squares_numpy(1000)"
    100000 loops, best of 3: 5.31 usec per loop

  1. The evented servers are bound to one CPU, Erlang will use all CPUs 
  2. any bit of blocking code will stall the other code, even it just for a moment.