What does this Python snippet output?

Console output

Why

Since Python 3.8, an f-string field ending in "=" is "self-documenting": it prints the literal source text of the expression, an equals sign, then the evaluated value. The whitespace you write around the "=" is reproduced exactly, so `{x + y = }` becomes "x + y = 8". It is a debugging convenience that saves you from repeating the expression text by hand.