* ASN.1 classes improved to better duck-type their Python friends
* A new codec for transforming Python built-in types into ASN.1 objects and back implemented
* BitString type usability improved in many ways
* Sphinx documentation added 
More changes noted in the CHANGELOG .
What is pyasn1
The pyasn1 library implements ASN.1 data types and serialization protocols in pure Python.
It aims at standards compliancy and universal applicability. More information on library features,
use and further development directions can be found on project’s GitHub page.