The cost to hire Python developers depends on many factors, but all in all, there are a few main ones.

The cost varies depending on the scope of your project, the experience, and skill set of the developers, and, more importantly, where your product development team is located. 

The avg yearly salary of a Python developer in the US is ~$100,000/year, while it can be ~$50,000 to $70,000 anywhere else in the world.