Optional Function Parameters in Computer Language Docs (the idiocy thereof)
bisect.bisect_left(list, item[, lo[, hi]])
this is unreadable and confusing, especially because square brackets are valid syntax in the lang.
the tech geeking idiots write it that way because, writing it that way makes them computer scientists. It came from certain BNF. In particular, pythoners live in a world of “comp sci R us”.
what it means is this, any one of the following:
bisect.bisect_left(list, item) bisect.bisect_left(list, item , lo) bisect.bisect_left(list, item , lo, hi)
Here's another example, from PHP Return array entries that match the pattern
array preg_grep ( string $pattern , array $input [, int $flags = 0 ] )
Addendum. In python doc for version 2.7 and 3.1 and later, they corrected this.
Now they write it like this:
bisect.bisect_left(a, x, lo=0, hi=len(a)).
Thanks to Yuri Khan.