Create a collection of name/value pairs. Example enumeration: >>> class Color(Enum): ... RED = 1 ... BLUE = 2 ... GREEN = 3 Access them by: - attribute access: >>> Color.RED <Color.RED: 1> - value lookup: >>> Color(1) <Color.RED: 1> - name lookup: >>> Color['RED'] <Color.RED: 1> Enumerations can be iterated over, and know how many members they have: >>> len(Color) 3 >>> list(Color) [<Color.RED: 1>, <Color.BLUE: 2>, <Color.GREEN: 3>] Methods can be added to enumerations, and members can have their own attributes -- see the documentation for details.

Class for options on fixed coupon bonds. These are options to either buy or sell a bond on or before a specific future expiry date at a strike price that is set on trade date. A European option only allows the bond to be exercised into on a specific expiry date. An American option allows the option holder to exercise early, potentially allowing earlier coupons to be received.