ACI 4.x Cobra SDK Support Python 3 as of January 2020
Cobra SDK files are always downloadable from a physical APIC.
Cobra SDK files are not downloadable from the APIC simulator, nor are they available from the Cobra Github Repository. However, they can be built from the source.
ACI Learning Labs
The ACI Learning Labs utilizing the Cobra SDK have been updated for ACI 4 and Python 3