Function deposit 

pub(crate) fn deposit(
    template: &Bound<'_, PyAny>,
    valuation: NaiveDate,
    tenor: &str,
    rate: f64,
    notional: f64,
) -> PyResult<PyRung>

A money-market deposit rung: lent on valuation, maturing tenor on under the template’s calendar and convention, on its day count, quoted at rate. Labelled by its tenor.