[or_am_i]

Yeah, the `numpy` version still looks relatively cryptic (like, "line > 0" is still fine, but the numpy arrays broadcasting rules can quickly get out of hand) compared to the author's Javascript example, or any decent collections API in a typed "enterprise" language like C#/Java/Scala for that matter. Here's my personal favorite, a Kotlin version:

  diffs.countIf { line -> 
      line.all { abs(it) in 1..3 } and ( 
          line.all { it > 0} or
          line.all { it < 0}
      )
  }