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python模块介绍大全.pdf
Data Persistence and Exchange
Serializing Objects
Storing Serialized Objects
Relational Databases
Data Exchange Through Standard Formats
In-Memory Data Structures
array
Sorting
Queue
collections
Decoding Data
Custom Variations
File Access
Filenames
Meta-data
Reading Files
Temporary Files
Files and Directories
Text Processing Tools
string module
Text Input
Text Output
Comparing Values
Built-in Objects
exceptions – Built-in error classes
String Services
codecs – String encoding and decoding
difflib – Compare sequences
string – Working with text
StringIO and cStringIO – Work with text buffers using file-like API
re – Regular Expressions
struct – Working with Binary Data
textwrap – Formatting text paragraphs
Data Types
array – Sequence of fixed-type data
datetime – Date/time value manipulation
calendar – Work with dates
collections – Container data types
heapq – In-place heap sort algorithm
bisect – Maintain lists in sorted order
sched – Generic event scheduler.
Queue – A thread-safe FIFO implementation
weakref – Garbage-collectable references to objects
copy – Duplicate objects
pprint – Pretty-print data structures
Numeric and Mathematical Modules
decimal – Fixed and floating point math
fractions – Rational Numbers
functools – Tools for Manipulating Functions
itertools – Iterator functions for efficient looping
math – Mathematical functions
operator – Functional interface to built-in operators
random – Pseudorandom number generators
Internet Data Handling
base64 – Encode binary data into ASCII characters
json – JavaScript Object Notation Serializer
mailbox – Access and manipulate email archives
mhlib – Work with MH mailboxes
File Formats
csv – Comma-separated value files
ConfigParser – Work with configuration files
robotparser – Internet spider access control
Cryptographic Services
hashlib – Cryptographic hashes and message digests
hmac – Cryptographic signature and verification of messages.
File and Directory Access
os.path – Platform-independent manipulation of file names.
fileinput – Process lines from input streams
filecmp – Compare files
tempfile – Create temporary filesystem resources.
glob – Filename pattern matching
fnmatch – Compare filenames against Unix-style glob patterns.
linecache – Read text files efficiently
shutil – High-level file operations.
dircache – Cache directory listings
Data Compression and Archiving
bz2 – bzip2 compression
gzip – Read and write GNU zip files
tarfile – Tar archive access
zipfile – Read and write ZIP archive files
zlib – Low-level access to GNU zlib compression library
Data Persistence
anydbm – Access to DBM-style databases
dbhash – DBM-style API for the BSD database library
dbm – Simple database interface
dumbdbm – Portable DBM Implementation
gdbm – GNU's version of the dbm library
pickle and cPickle – Python object serialization
shelve – Persistent storage of arbitrary Python objects
whichdb – Identify DBM-style database formats
sqlite3 – Embedded Relational Database
Generic Operating System Services
os – Portable access to operating system specific features.
time – Functions for manipulating clock time
getopt – Command line option parsing
optparse – Command line option parser to replace getopt.
argparse – Command line option and argument parsing.
logging – Report status, error, and informational messages.
getpass – Prompt the user for a password without echoing.
platform – Access system version information
Optional Operating System Services
threading – Manage concurrent threads
mmap – Memory-map files
multiprocessing – Manage processes like threads
readline – Interface to the GNU readline library
rlcompleter – Adds tab-completion to the interactive interpreter
Unix-specific Services
commands – Run external shell commands
grp – Unix Group Database
pipes – Unix shell command pipeline templates
pwd – Unix Password Database
resource – System resource management
Interprocess Communication and Networking
asynchat – Asynchronous protocol handler
asyncore – Asynchronous I/O handler
signal – Receive notification of asynchronous system events
subprocess – Work with additional processes
Internet Protocols and Support
BaseHTTPServer – base classes for implementing web servers
cgitb – Detailed traceback reports
Cookie – HTTP Cookies
imaplib - IMAP4 client library
SimpleXMLRPCServer – Implements an XML-RPC server.
smtpd – Sample SMTP Servers
smtplib – Simple Mail Transfer Protocol client
socket – Network Communication
select – Wait for I/O Efficiently
SocketServer – Creating network servers.
urllib – simple interface for network resource access
urllib2 – Library for opening URLs.
urlparse – Split URL into component pieces.
uuid – Universally unique identifiers
webbrowser – Displays web pages
xmlrpclib – Client-side library for XML-RPC communication
Structured Markup Processing Tools
xml.etree.ElementTree – XML Manipulation API
Internationalization
gettext – Message Catalogs
locale – POSIX cultural localization API
Program Frameworks
cmd – Create line-oriented command processors
shlex – Lexical analysis of shell-style syntaxes.
Development Tools
doctest – Testing through documentation
pydoc – Online help for Python modules
unittest – Automated testing framework
pdb – Interactive Debugger
Debugging and Profiling
profile, cProfile, and pstats – Performance analysis of Python programs.
timeit – Time the execution of small bits of Python code.
trace – Follow Python statements as they are executed
Python Runtime Services
abc – Abstract Base Classes
atexit – Call functions when a program is closing down
contextlib – Context manager utilities
gc – Garbage Collector
inspect – Inspect live objects
site – Site-wide configuration
sys – System-specific Configuration
sysconfig – Interpreter Compile-time Configuration
traceback – Extract, format, and print exceptions and stack traces.
warnings – Non-fatal alerts
Importing Modules
imp – Interface to module import mechanism.
pkgutil – Package Utilities
zipimport – Load Python code from inside ZIP archives
Miscelaneous
EasyDialogs – Carbon dialogs for Mac OS X
plistlib – Manipulate OS X property list files
History
Python Module Index
Index
Python Module of the Week
Release 1.132
Doug Hellmann
July 08, 2011
CONTENTS
1 Data Persistence and Exchange
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Serializing Objects .
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Storing Serialized Objects .
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Relational Databases .
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1.4 Data Exchange Through Standard Formats
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2 In-Memory Data Structures
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2.1
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2.3 Queue .
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2.5 Decoding Data .
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Custom Variations .
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Sorting .
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collections
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3 File Access
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3.2 Meta-data .
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Reading Files .
Temporary Files
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Files and Directories .
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4 Text Processing Tools
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string module .
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Text Input .
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Text Output .
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Comparing Values .
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5 Built-in Objects
5.1
exceptions – Built-in error classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 String Services
6.1
6.2
6.3
6.4
6.5
6.6
6.7
codecs – String encoding and decoding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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difflib – Compare sequences .
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string – Working with text
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StringIO and cStringIO – Work with text buffers using file-like API . . . . . . . . . . . . . . . . .
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re – Regular Expressions .
struct – Working with Binary Data .
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textwrap – Formatting text paragraphs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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7 Data Types
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array – Sequence of fixed-type data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.1
datetime – Date/time value manipulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
7.2
calendar – Work with dates
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7.3
collections – Container data types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110
7.4
heapq – In-place heap sort algorithm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121
7.5
bisect – Maintain lists in sorted order
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7.6
7.7
sched – Generic event scheduler. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
7.8 Queue – A thread-safe FIFO implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
7.9 weakref – Garbage-collectable references to objects
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7.10 copy – Duplicate objects .
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7.11 pprint – Pretty-print data structures
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8 Numeric and Mathematical Modules
153
decimal – Fixed and floating point math . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
fractions – Rational Numbers
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functools – Tools for Manipulating Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
itertools – Iterator functions for efficient looping . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171
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operator – Functional interface to built-in operators . . . . . . . . . . . . . . . . . . . . . . . . . . . 195
random – Pseudorandom number generators
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8.1
8.2
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8.5 math – Mathematical functions
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8.7
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9 Internet Data Handling
213
base64 – Encode binary data into ASCII characters . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
9.1
. 215
9.2
json – JavaScript Object Notation Serializer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9.3 mailbox – Access and manipulate email archives . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 224
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9.4 mhlib – Work with MH mailboxes .
10 File Formats
233
10.1 csv – Comma-separated value files
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10.2 ConfigParser – Work with configuration files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240
10.3 robotparser – Internet spider access control
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11 Cryptographic Services
255
11.1 hashlib – Cryptographic hashes and message digests . . . . . . . . . . . . . . . . . . . . . . . . . . 255
11.2 hmac – Cryptographic signature and verification of messages.
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12 File and Directory Access
263
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12.1 os.path – Platform-independent manipulation of file names.
. 268
12.2 fileinput – Process lines from input streams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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12.3 filecmp – Compare files
12.4 tempfile – Create temporary filesystem resources. . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 279
12.5 glob – Filename pattern matching . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283
12.6 fnmatch – Compare filenames against Unix-style glob patterns.
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12.7 linecache – Read text files efficiently . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287
12.8 shutil – High-level file operations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 290
12.9 dircache – Cache directory listings .
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13 Data Compression and Archiving
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299
13.1 bz2 – bzip2 compression .
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13.2 gzip – Read and write GNU zip files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
13.3 tarfile – Tar archive access .
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13.4 zipfile – Read and write ZIP archive files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 318
13.5 zlib – Low-level access to GNU zlib compression library . . . . . . . . . . . . . . . . . . . . . . . . 326
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14 Data Persistence
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333
14.1 anydbm – Access to DBM-style databases . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333
14.2 dbhash – DBM-style API for the BSD database library . . . . . . . . . . . . . . . . . . . . . . . . . 335
14.3 dbm – Simple database interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
14.4 dumbdbm – Portable DBM Implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
14.5 gdbm – GNU’s version of the dbm library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
14.6 pickle and cPickle – Python object serialization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 337
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14.7 shelve – Persistent storage of arbitrary Python objects
14.8 whichdb – Identify DBM-style database formats
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14.9 sqlite3 – Embedded Relational Database
15 Generic Operating System Services
377
15.1 os – Portable access to operating system specific features.
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15.2 time – Functions for manipulating clock time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 393
15.3 getopt – Command line option parsing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 397
15.4 optparse – Command line option parser to replace getopt.
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15.5 argparse – Command line option and argument parsing.
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15.6 logging – Report status, error, and informational messages. . . . . . . . . . . . . . . . . . . . . . . . 433
15.7 getpass – Prompt the user for a password without echoing.
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15.8 platform – Access system version information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 438
16 Optional Operating System Services
443
16.1 threading – Manage concurrent threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443
16.2 mmap – Memory-map files
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16.3 multiprocessing – Manage processes like threads . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463
16.4 readline – Interface to the GNU readline library . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 484
16.5 rlcompleter – Adds tab-completion to the interactive interpreter
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17 Unix-specific Services
495
17.1 commands – Run external shell commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 495
17.2 grp – Unix Group Database .
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17.3 pipes – Unix shell command pipeline templates . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. 500
17.4 pwd – Unix Password Database . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 506
17.5 resource – System resource management
. 509
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18 Interprocess Communication and Networking
18.1 asynchat – Asynchronous protocol handler
. 513
18.2 asyncore – Asynchronous I/O handler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 518
18.3 signal – Receive notification of asynchronous system events . . . . . . . . . . . . . . . . . . . . .
. 530
18.4 subprocess – Work with additional processes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 535
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19 Internet Protocols and Support
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547
19.1 BaseHTTPServer – base classes for implementing web servers . . . . . . . . . . . . . . . . . . . . . 547
19.2 cgitb – Detailed traceback reports . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 552
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19.3 Cookie – HTTP Cookies .
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19.4 imaplib - IMAP4 client library .
19.5 SimpleXMLRPCServer – Implements an XML-RPC server.
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19.6 smtpd – Sample SMTP Servers
19.7 smtplib – Simple Mail Transfer Protocol client
. 595
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19.8 socket – Network Communication .
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19.9 select – Wait for I/O Efficiently .
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19.10 SocketServer – Creating network servers.
. 632
19.11 urllib – simple interface for network resource access . . . . . . . . . . . . . . . . . . . . . . . . . . 639
19.12 urllib2 – Library for opening URLs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 645
19.13 urlparse – Split URL into component pieces.
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19.14 uuid – Universally unique identifiers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 657
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19.15 webbrowser – Displays web pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 661
19.16 xmlrpclib – Client-side library for XML-RPC communication . . . . . . . . . . . . . . . . . . . . . 663
20 Structured Markup Processing Tools
671
20.1 xml.etree.ElementTree – XML Manipulation API . . . . . . . . . . . . . . . . . . . . . . . . . . . . 671
21 Internationalization
21.1 gettext – Message Catalogs
21.2 locale – POSIX cultural localization API
.
.
.
.
691
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 691
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 697
22 Program Frameworks
22.1 cmd – Create line-oriented command processors
22.2 shlex – Lexical analysis of shell-style syntaxes. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
705
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 705
. 714
23 Development Tools
723
. 723
23.1 doctest – Testing through documentation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23.2 pydoc – Online help for Python modules
. 742
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
23.3 unittest – Automated testing framework . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 743
23.4 pdb – Interactive Debugger
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 749
.
.
24 Debugging and Profiling
777
24.1 profile, cProfile, and pstats – Performance analysis of Python programs. . . . . . . . . . . . . . . . . 777
24.2 timeit – Time the execution of small bits of Python code. . . . . . . . . . . . . . . . . . . . . . . . . 782
24.3 trace – Follow Python statements as they are executed . . . . . . . . . . . . . . . . . . . . . . . . . 787
25 Python Runtime Services
.
795
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 795
25.1 abc – Abstract Base Classes .
25.2 atexit – Call functions when a program is closing down . . . . . . . . . . . . . . . . . . . . . . . .
. 802
25.3 contextlib – Context manager utilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 805
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 810
.
25.4 gc – Garbage Collector .
.
.
25.5 inspect – Inspect live objects .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 826
25.6 site – Site-wide configuration .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 836
.
25.7 sys – System-specific Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 842
25.8 sysconfig – Interpreter Compile-time Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 881
25.9 traceback – Extract, format, and print exceptions and stack traces.
. . . . . . . . . . . . . . . . . . . 885
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 890
25.10 warnings – Non-fatal alerts .
.
.
.
.
.
26 Importing Modules
26.1 imp – Interface to module import mechanism. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
26.2 pkgutil – Package Utilities .
26.3 zipimport – Load Python code from inside ZIP archives
897
. 897
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 900
. . . . . . . . . . . . . . . . . . . . . . . . 907
.
.
27 Miscelaneous
27.1 EasyDialogs – Carbon dialogs for Mac OS X . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
27.2 plistlib – Manipulate OS X property list files
913
. 913
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 926
28 History
Python Module Index
Index
iv
931
943
945
About Python Module of the Week
Python Module of the Week, Release 1.132
PyMOTW is a series of blog posts written by Doug Hellmann (http://www.doughellmann.com/). It was started as a
way to build the habit of writing something on a regular basis. The focus of the series is building a set of example
code for the modules in the Python (http://www.python.org/) standard library.
Complete
http://docs.python.org/library/contents.html.
the Python web
documentation
standard
library
found
site
can
the
for
on
be
at
Tools
The source text for PyMOTW is reStructuredText (http://docutils.sourceforge.net/) and the HTML and PDF output are
created using Sphinx (http://sphinx.pocoo.org/).
Subscribe
new articles
As
Updates
(http://www.feedburner.com/fb/a/emailverifySubmit?feedId=806224&loc=en_US). See
page for details (http://www.doughellmann.com/PyMOTW/).
posted
(http://feeds.feedburner.com/PyMOTW)
are written,
available
(http://blog.doughellmann.com/).
email
the project home
to my
RSS
blog
they
and
are
are
by
Translations and Other Versions
a
Cai
and
Yan
have
code
called
Sheng
started
google
project
PyMOTWCN
Junjie
(http://code.google.com/p/pymotwcn/) and posted the completed translations at http://www.vbarter.cn/pymotw/.
Ralf Schönian is translating PyMOTW into German, following an alphabetical order. The results are avail-
able on his web site, http://schoenian-online.de/pymotw.html. Ralf is an active member of the pyCologne
(http://wiki.python.de/User_Group_K%C3%B6ln?action=show&redirect=pyCologne) user group in Germany and au-
thor of pyVoc, the open source English/German vocabulary trainer (http://code.google.com/p/pyvoc/).
Roberto Pauletto is working on an Italian translation at http://robyp.x10hosting.com/. Roberto creates Windows ap-
plications with C# by day, and tinkers with Linux and Python at home. He has recently moved to Python from Perl for
all of his system-administration scripting.
Ernesto Rico Schmidt (http://denklab.org/) provides a Spanish translation that follows the English version posts.
Ernesto is in Bolivia, and is translating these examples as a way to contribute to the members of the Bo-
livian Free Software (http://www.softwarelibre.org.bo/) community who use Python. The full list of articles
available in Spanish can be found at http://denklab.org/articles/category/pymotw/, and there is an RSS feed
(http://denklab.org/feeds/articles/category/pymotw/).
Tetsuya Morimoto (http://d.hatena.ne.jp/t2y-1979/) is creating a Japanese translation. Tetsuya has used Python for 1.5
years. He has as experience at a Linux Distributor using Python with yum, anaconda, and rpm-tools while building
RPM packages. Now, he uses it to make useful tools for himself, and is interested in application frameworks such as
Django, mercurial and wxPython. Tetsuya is a member of Python Japan User’s Group (http://www.python.jp/Zope/)
and Python Code Reading (http://groups.google.co.jp/group/python-code-reading). The home page for his translation
is http://d.hatena.ne.jp/t2y-1979/20090525/1243227350.
Gerard Flanagan is working on a “Python compendium” called The Hazel Tree (http://www.thehazeltree.org/). He is
converting a collection of old and new of Python-related reference material into reStructuredText and then building a
single searchable repository from the results. I am very pleased to have PyMOTW included with works from authors
like Mark Pilgrim, Fredrik Lundh, Andrew Kuchling, and a growing list of others.
CONTENTS
1
Python Module of the Week, Release 1.132
Other Contributors
Thank you to John Benediktsson for the original HTML-to-reST conversion.
Copyright
All of the prose from the Python Module of the Week is licensed under a Creative Commons Attribution, Non-
commercial, Share-alike 3.0 (http://creativecommons.org/licenses/by-nc-sa/3.0/us/) license. You are free to share and
create derivative works from it. If you post the material online, you must give attribution and link to the PyMOTW
home page (http://www.doughellmann.com/PyMOTW/). You may not use this work for commercial purposes. If you
alter, transform, or build upon this work, you may distribute the resulting work only under the same or similar license
to this one.
The source code included here is copyright Doug Hellmann and licensed under the BSD license.
Copyright Doug Hellmann, All Rights Reserved
Permission to use, copy, modify, and distribute this software and its documentation for any purpose and
without fee is hereby granted, provided that the above copyright notice appear in all copies and that both
that copyright notice and this permission notice appear in supporting documentation, and that the name of
Doug Hellmann not be used in advertising or publicity pertaining to distribution of the software without
specific, written prior permission.
DOUG HELLMANN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, IN-
CLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT
SHALL DOUG HELLMANN BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
SOFTWARE.
This section of the PyMOTW guide includes feature-based introductions to several modules in the standard library,
organized by what your goal might be. Each article may include cross-references to several modules from different
parts of the library, and show how they relate to one another.
2
CONTENTS
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