get_used_memory

So I looked at the example Gambas program at
<https://gambaswiki.org/wiki/doc/whatisgambas> and marvelled at its
unnecessary complexity (UUOC, even). It’s like PHP with variable
declarations!

Here’s my version: excluding header comments and blank lines and
shebang line, it’s about half the size.

info = dict \
  (
    (entry[0][:-1], int(entry[-2]))
    for line in open("/proc/meminfo", "rt")
    for entry in (tuple(s.strip() for s in line.split(" ")),)
    if entry[-2] != ""
  )
print("Used memory: %d Kb" % (info["MemTotal"] - info["MemFree"] - info["Buffers"] - info["Cached"] + info["SwapTotal"] - info["SwapFree"] - info["SwapCached"]))