> That one was confusing to me, because I'm not a heavy Python user. I've never encountered all() before. However, after looking up the all() function in the Py

> That one was confusing to me, because I'm not a heavy Python user. I've never encountered all() before. However, after looking up the all() function in the Python documentation that code becomes immediately obvious. > "a group of words established by usage as having a meaning not deducible from those of the individual words (e.g., rain cats and dogs, see the light)." Perhaps this is actually a really good illustration of 'idiom' meaning the same thing (roughly) in programming as it does in day-to-day use. I'm not a Python dev, but I'm willing to bet that a Python dev knows the all() function, in the same way that a Javascript dev knows about something like .bind(this), or querySelectorAll, or a CSS 'dev', the horror, "margin: 0 auto;". If that's not the case I might be wrong.