import contracts as ct schedule = ct.Schedule(start_date='2000-01-01', end_date='2030-01-01', frequency= ct.Frequency.Annual, calendar= cl.Calendar.USGovernmentBond, convention=ct.Convention.Following, dateroll=ct.DateRoll.Forward) bond = ct.FixedRateBond(settlement_days=2,face_value=10000, day_count=ct.DayCount.Actual360, coupon=0.05,schedule=schedule) ytm = vl.yield_to_maturity(contract=bond, curve=curve)