One of the problems for programmers is that there are few certifications available. While being certified as a programmer isn't necessarily required (your coding skills can be demonstrated easily enough, especially if you keep a portfolio of completed projects), in this day-and-age, many people expect certifications.
The good news is that O'Reilly Publishing has started a certification program for programmers and other tech-related skills. The bad news is that it is pretty expensive and time consuming: $2000 and 360 hours.
However, at the end of the course you will have learned pretty much everything there is to know about Python: database interaction, large-scale web apps, debugging, optimization, multi-threading, etc. My goal is to complete this certification and use my new knowledge to write the third revision of my book.