The modules described in this chapter provide interfaces to operating system features that are available on selected operating systems only. The interfaces are generally modelled after the Unix or C interfaces but they are available on some other systems as well (e.g. Windows or NT). Here's an overview:
gzip
program (zlib is the low-level interface, gzip the
high-level one).
signal
socket
select
thread
Queue
anydbm
and dumbdbm
whichdb
zlib
gzip