In brief, the Python SIGCHLD problem is that while C-level SIGCHLD signal handlers are protected against reentrancy, your Python level SIGCHLD handler function is not, because it is not actually executedas a C-level signal handler. This winds up causing heartburn andpotential explosions if you do anything sophisticated when childprocesses exit. (See SIGCHLDVsPython for a longer discussion.)

In thinking about the problem, I've realized that signal.signal() is itself a peculiar but useful atomic operation. This is important,

Web servers and many web applications are quite insistent that URLs thatrepresent 'directories' have to end in a slash; if you request the URLwithout the trailing slash, they just give you a redirection to the sameURL with a slash on the end instead of the actual content. One mightwell wonder why they have this neurotic insistence, especially when it complicates URL rewriting for applications thatcan do whatever they want with incoming URLs anyways.

(The other side of this question is whether web applications have tocare about

One of the things that strikes me about Saki is how unimportant theactual mahjong games are. While it matters who wins (and sometimeshow powerful their win was), the show pays almost no attention to theactual process of playing and winning. This is especially striking inthe past two episodes (6 and 7), where the show has been focusing on atournament.

(Sometimes we get a little bit of dialog about strategy issues.)

This is rather unusual for a nominal sports anime, but does mean