> return headers.get('x-foo') == settings.FOO_KEY is not None I'm a huge Python fanboy and this line is absolutely awful. Comparison chains are great for

> return headers.get('x-foo') == settings.FOO_KEY is not None I'm a huge Python fanboy and this line is absolutely awful. Comparison chains are great for stuff like "x < y < z" or "x == y == z", but the operators should never be mixed. "Readability counts" is, IMO, the most important line in the Zen of Python, and that line is unreadable. I imagine it's equivalent to: return headers.get('x-foo') == settings.FOO_KEY and settings.FOO_KEY is not None Which, admittedly, feels like a clumsy line of code, but it's at least readable.