David Abrahams reported missing right parens for 
list.pop() and list.sort() in the docs at 
http://www.python.org/dev/doc/devel/lib/typesseq-
mutable.html 

I scanned forward and also found them missing for 
dict.get() and dict.setdefault().

The parens *are* in the tex files.  It appears that 
there is a strange interaction between the \optional 
macro and the enclosing \lineiii macro resulting in 
the paren being consumed.

Older versions of the docs are okay, so the bug is new.

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Finally!  This was a bug in a modified version of the
support for the \optional macro in my working directory, and
was never checked in.  I've removed the changes from my
working directory, and will update the online version shortly.