Eh? They're pointing out it's an extremely well optimised and fast library, and then pointing out a number of ways in which it's a footgun because it doesn't b

Eh? They're pointing out it's an extremely well optimised and fast library, and then pointing out a number of ways in which it's a footgun because it doesn't behave as you'd expect, e.g. NYC = pytz.timezone('America/New_York') dt = datetime(2018, 2, 14, 12, tzinfo=NYC) print(dt) # 2018-02-14 12:00:00-04:56 How is that not a footgun?