from QuantLib import *
index = Euribor(Period(3, Months))
start = DateParser_parseISO("2019-02-22")
end = DateParser_parseISO("2019-05-22")
coupon = IborCoupon(end, 1.0, start, end, 2, index)
fixDate = coupon.fixingDate()
index.addFixing(fixDate, 0.04)
print coupon.amount()