3 ms·

x = stuff while x: x = stuff

• Delgan 8y ago
  On the contrary, loop-and-a-half is intended to avoid repeating stuff outside and inside of the loop body. while true: x = stuff if not x: break
  • chucksmash 8y ago
    GPs example is perfectly valid as well - this is just a restatement of the same logic in a way that keeps the logic contained within the loop at the cost of using a conditional plus a break inside of an unconditional loop. See [0]: Another motivating code pattern is the "loop and a half". It was once common for processing a file by line, but that has been solved by making file objects iterable; however other non-iterable interfaces still suffer from patterns like: line = f.readline() while line: ... # process line line = f.readline() or like this: while True: line = f.readline() if not line: break ... # process line Either of those could be replaced with a much more clear and concise version using an assignment expression: while line := f.readline(): ... # process line [0]: https://lwn.net/Articles/757713/ https://lwn.net/Articles/757713/