On working with code examples

I have been busy the whole January with a development task for one of my customers. We had settled on delivering the solution with Go, even though my experience with this programming language had been very limited. Decision had been based on of the quality aspects, that is - maintainability. My customer works daily with Go, and very sporadically with other languages. Had I delivered solution in Python, for example, it would be easy for me to deliver, but difficult for them to keep effectively working with the solution afterwards, should our relationship head south at any point in time.