'Target machine word size, in bytes (i.e. the size of general purpose registers).
This is a convenience wrapper around ``bits / 8``.
Examples:
>>> context.bytes = 1
>>> context.bits == 8
True
>>> context.bytes = 0 #doctest: +ELLIPSIS
Traceback (most recent call last):
AttributeError: bits must be > 0 (0)'

@property
def bytes(self):

    return (self.bits / 8)
