@coupon.setter<EOL><INDENT>def coupon(self, coupon):<DEDENT>
if coupon is not None:<EOL><INDENT>self._coupon = Decimal(coupon)<EOL><DEDENT>
The coupon paid out by the bond.  Represented as a fraction of 1 (e.g. 0.05 is 5%).
:param coupon:
:return: