I wanna get the type of the municipal bonds, like whether it is GO or revenue, I am also trying to count how many underwriters are there in the manager group. So I made python code like this:
df1 = rdp.search(
        view = rdp.SearchViews.MunicipalInstruments,
        filter = fil,
        top = 10000,
        select = "CUSIP,SecurityType,UnderWriterAmount"
    )
But I got nothing from the returned dataframe, what should I do?