The Open Group Base Specification Issue 6 is, well, toquote it:

This standard is the single common revision to IEEE Std 1003.1-1996,IEEE Std 1003.2-1992, and the Base Specifications of The Open GroupSingle UNIX Specification, Version 2.

(Those IEEE standards are better known as 'POSIX'.)

The Single Unix Specification (SUS) is a very useful authoritativereference for how various things should behave in theory

Today I was unpleasantly surprised to discover that Postfix defaults tohaving a 50 megabyte size limit on user mailboxes, after which emailbounces. This default limit is apparently sufficiently unimportant tonot be mentioned in the 'basic' or 'standard' general configurationdocumentation.

Perhaps this will strike people as a petty reason for disliking Postfix;after all, it's just one configuration option. But it is the symptom ofa deeper problem.

Since Postfix people have made one dangerous random arbitrary default(and not drawn attention

In the process of looking at my program's code again to write the lastentry , I think I may have solved the mystery ofhow my impossible exception gets generated.

My program does a lot of forking and thus cleanups of now-dead children.The code that it generally dies on is:

def _delip(pid, ip):  del ipmap[ip][pid]  if len(ipmap[ip]) == 0:    del ipmap[ip]

It takes a KeyError on the len