size_bytes.py

# SI units, 1000 base
def sizeof_fmt_si(num, suffix='B'):
  for unit in ['', 'K', 'M', 'G', 'T', 'P', 'E', 'Z']:
    if abs(num) < 1000.0:
      return "%3.1f%s%s" % (num, unit, suffix)
    num /= 1000.0
  return "%.1f%s%s" % (num, 'Yi', suffix)


# Binary prefix, 1024 base
def sizeof_fmt_binary(num, suffix='B'):
  for unit in ['', 'Ki', 'Mi', 'Gi', 'Ti', 'Pi', 'Ei', 'Zi']:
    if abs(num) < 1024.0:
      return "%3.1f%s%s" % (num, unit, suffix)
    num /= 1024.0
  return "%.1f%s%s" % (num, 'Yi', suffix)