ql.Period()
ql.Period(n, TimeUnit)
creates a period of length n TimeUnits. TimeUnitsmay be ql.Days, ql.Weeks, ql.Months, ql.Years.ql.Period(Frequency)
creates a period of Frequency where Frequency may be ql.Annual, ql.Semiannual, ql.EveryFourthMonth, ql.Quarterly, ql.Bimonthly, ql.Monthly, ql.Weekly, ql.Daily, ql.OtherFrequency, ql.NoFrequencyint P:length() returns length of P
Creates a QuantLib period object