parser comparisons, 1457
PyTree GUI and, 1456–1457
writing, 1440
defined, 1405
email content, 921–947
HTML support, 779, 1430, 1435–1438
parser decoding requirement, 927–929
recursive descent, 1439, 1440
regular expression support, 1431
rule strings, 1412–1415
with splits and joins, 1409
XML support, 779, 1429, 1430–1435
passwords
encrypting, 1278–1286
escaping in HTML, 1264–1266
PyMailCGI password page, 1250
pattern matching (see regular expressions)
pattern objects (re module), 1417
performance
PyMailCGI program and, 1293
PyMailGUI program and, 1122, 1293
saving thumbnail files, 500
stacks and, 1366, 1373
string object methods and, 1415
threads and, 186
Perl language, 1547, 1556
permissions
CGI scripts and, 1215
HTML constraints, 1140
persistence
DBM files, 1305–1308
object relational mappers, 1354–1356
options available, 1303
pickled objects, 1309–1315
programming considerations, 34–36
shelve files, 1315–1325
SQL databases, 1329–1354
ZODB system, 1325–1329
Peters, Tim, 70
Pexpect package
output stream buffering and, 131, 234
overview, 76
PhotoImage widget class, 411, 484–491, 517
pickle module
background information, 1415
constraints, 1323–1324
functionality, 19–22, 786, 1309
per-record pickle files, 22–23
Pickler class, 1310
PyMailGUI program and, 1119
Unpickler class, 1310
pickled objects
defined, 1304, 1309
usage considerations, 1310–1315
PIL (Python Imaging Library) extension toolkit
animation and, 595
basics overview, 491
creating image thumbnails, 496–505
displaying other image types, 493–496
functionality, 358, 366
images in toolbars, 520
thumbnail support, 557
pipe character (|), 116
Pipe object (multiprocessing), 248
pipes
anonymous, 223, 224–233
command-line, 232, 654–662, 838, 839
implementing, 224
multiprocessing module and, 249
named, 223, 234–236
sockets and, 659
unbuffered modes, 232
playfile module, 866
Plone website builder, 778
plotting points on a circle, 747–751
PLY parsing system, 1439
Pmw (Python Mega Widgets) extension toolkit
functionality, 358, 364
scrolling support, 505
polymorphism, 123
POP (Post Office Protocol)
fetching email at interactive prompt, 909
mail configuration module, 902–905
mail reader script, 905–909
overview, 901
PyMailCGI and, 1249–1266, 1272–1275,
1277–1286
PyMailGUI and, 1051–1053
poplib module
functionality, 786, 900
mail reader script, 905
pymail script and, 947
PyMailCGI program and, 1232, 1260
popmail script, 902, 905–909
port numbers
defined, 782
protocol rules, 783
reserved, 801–802Index| 1571