Enum changes in YDK 0.4.0

YDK 0.4.0 introduced a couple of changes to enums that are not backward compatible with YDK 0.3.0. 

• First, the new enum implementation is based on the enum34 module.  This module backports the enum implementation in Python 3.4 to Python 2.4 and later. 
• Second, enum class names do not use underscores anymore.  These changes make our enum class easier to use and their names more pythonic.

 Let's take a look at the Cisco_IOS_XR_clns_isis_cfg model used to configure the IS-IS protocol.  That model makes frequent use of enums.  As an example, let's compare the enum class used to configure the level associated with an adjacency

YDK 0.3.0

Class name: IsisConfigurableLevels_Enum

 YDK 0.4.0

Class name: IsisConfigurableLevelsEnum

 More importantly, it's now simpler to access the value and name of an enum. 

The isis.instances.instance.is_type attribute/leaf is an object of the IsisConfigurableLevelsEnum class. 

You can access its attributes using:

• isis.instances.instance.is_type.name
• Isis.Instances.Instance.is_type.value

This change also paves the road to support Python 3 in the future.

Happy coding!