You really have to understand how it's translated into actual code, and of course it's Python, so there's some legacy syntax to take into account. A `:` just m

You really have to understand how it's translated into actual code, and of course it's Python, so there's some legacy syntax to take into account. A `:` just means call format(lhs, rhs), for example. You can also actually combine those syntaxes - I often use f"{foo:%Y-%m-%d!r}" to get a quoted, properly escaped date in a specific format, for example.