Python developers might seem like a small, niche group in the programming world however the value they add to a web and app design firm is very large.
Python has efficient high-level data structures with a simple approach to object-oriented programming. Many people feel it uses an elegant syntax that combined with its interpreted nature make it perfect for scripting which lends well to website and app development.
From a business perspective, if you are hiring a company to do something it makes sense to have capable, qualified people available to everything you want done. For example, if you take your car in for auto repair ideally you would like a shop that can replace your battery, change the oil and change the brakes rather than having to go to different shops for each aspect.
Web and app development has evolved into a more complex world than it was just a decade ago. However, with the experienced staff at Lounge Lizard which includes Python developers, that complexity is actually an advantage that allows the creation of something amazing.