adding relational algebra, 1382
built-in options, 1374
classes and, 1377–1378
defined, 1373
functions and, 1375–1376
moving to dictionaries, 1378–1382
operations supported, 1373
shared memory
mmap module, 223
multiprocessing module and, 250–252
threads and, 186
shared state
forking processes and, 219
threads and, 220–222
shell commands
communicating with, 96
defined, 95
exit status codes, 216–219
find, 320
kill, 243
limitations, 99
os module support, 94
running, 95
subprocess module alternative, 97–99
shell variables
accessing, 103
changing, 111
defined, 109
environment settings, 113
fetching, 110
wrapping calls, 1495–1501
ShellGui tool
adding GUI frontends to command lines,
617–623
application-specific tool set classes, 615
functionality, 613
generic shell-tools display, 613–615
GUI input dialogs, 619–622
non-GUI scripts, 617–619
shelve files
changing classes of objects, 1320
constraints, 1321–1323
defined, 1304, 1315
standard operations, 1316
storing built-in object types, 1317
storing class instances, 1318–1320
usage considerations, 1316
shelve module
console interface, 37–39
dictionary-of-dictionaries format and, 14
functionality, 23–25
GUI interface, 46–51
open method, 25
pickle support and, 1315
PyMailGUI program and, 1119
unique objects and, 1322
usage considerations, 1316
web-based interfaces, 60–69
writeback argument, 1317, 1322
shutil module
additional information, 159
functionality, 76
signal handlers, 809–813
signal module
alarm function, 242
functionality, 76, 240–243
pause function, 241
signal function, 241
signals
defined, 223
functionality, 240–243
Silverlight framework, 361
SimpleEditor class
clipboard support, 537
functionality, 535
inheritance support, 537
limitations, 538
SIP system, 1512
Smalltalk language, 1547
SMTP (Simple Mail Transfer Protocol)
date formatting standard, 919
mail sender script, 911–919
overview, 910
PyMailCGI program, 1241–1249
sending email at interactive prompt, 919
smtplib module
functionality, 786, 901, 911
pymail script and, 947
PyMailCGI program and, 1232
PyMailGUI program and, 1034, 1122
smtpmail script, 911–919
SOAP
integration considerations, 1540
persistence options, 1304
pickled objects and, 1311
Web services support, 779
socket module
functionality, 76, 236–240, 786Index| 1577