code: def _do_setup(self):
          
          (self._base, self._power, self._name_singular, self._name_plural) = self._setup()
          self._unit_value = self._base ** self._power
docs: Setup basic parameters for this class.
  
  `base` is the numeric base which when raised to `power` is equivalent
  to 1 unit of the corresponding prefix. I.e., base=2, power=10
  represents 2^10, which is the NIST Binary Prefix for 1 Kibibyte.
  
  Likewise, for the SI prefix classes `base` will be 10, and the `power`
  for the Kilobyte is 3.