Python Cookbook

Second Edition April 2005
ISBN 978-0-596-00797-3
Seiten 844
EUR48.00, SFR78.90


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Inhaltsverzeichnis | Index | Probekapitel | Kolophon | Rezensionen |


Inhaltsverzeichnis

	

Preface

1. Text
      1.1 Processing a String One Character at a Time
      1.2 Converting Between Characters and Numeric Codes
      1.3 Testing Whether an Object Is String-like
      1.4 Aligning Strings
      1.5 Trimming Space from the Ends of a String
      1.6 Combining Strings
      1.7 Reversing a String by Words or Characters
      1.8 Checking Whether a String Contains a Set of Characters
      1.9 Simplifying Usage of Strings' translate Method
      1.10 Filtering a String for a Set of Characters
      1.11 Checking Whether a String Is Text or Binary
      1.12 Controlling Case
      1.13 Accessing Substrings
      1.14 Changing the Indentation of a Multiline String
      1.15 Expanding and Compressing Tabs
      1.16 Interpolating Variables in a String
      1.17 Interpolating Variables in a String in Python 2.4
      1.18 Replacing Multiple Patterns in a Single Pass
      1.19 Checking a String for Any of Multiple Endings
      1.20 Handling International Text with Unicode
      1.21 Converting Between Unicode and Plain Strings
      1.22 Printing Unicode Characters to Standard Output
      1.23 Encoding Unicode Data for XML and HTML
      1.24 Making Some Strings Case-Insensitive
      1.25 Converting HTML Documents to Text on a Unix Terminal

2. Files
      2.1 Reading from a File
      2.2 Writing to a File
      2.3 Searching and Replacing Text in a File
      2.4 Reading a Specific Line from a File
      2.5 Counting Lines in a File
      2.6 Processing Every Word in a File
      2.7 Using Random-Access Input/Output
      2.8 Updating a Random-Access File
      2.9 Reading Data from zip Files
      2.10 Handling a zip File Inside a String
      2.11 Archiving a Tree of Files into a Compressed tar File
      2.12 Sending Binary Data to Standard Output Under Windows
      2.13 Using a C++-like iostream Syntax
      2.14 Rewinding an Input File to the Beginning
      2.15 Adapting a File-like Object to a True File Object
      2.16 Walking Directory Trees
      2.17 Swapping One File Extension for AnotherThroughout a Directory Tree
      2.18 Finding a File Given a Search Path
      2.19 Finding Files Given a Search Path and a Pattern
      2.20 Finding a File on the Python Search Path
      2.21 Dynamically Changing the Python Search Path
      2.22 Computing the Relative Path from One Directory to Another
      2.23 Reading an Unbuffered Character in a Cross-Platform Way
      2.24 Counting Pages of PDF Documents on Mac OS X
      2.25 Changing File Attributes on Windows
      2.26 Extracting Text from OpenOffice.org Documents
      2.27 Extracting Text from Microsoft Word Documents
      2.28 File Locking Using a Cross-Platform API
      2.29 Versioning Filenames
      2.30 Calculating CRC-64 Cyclic Redundancy Checks

3. Time and Money
      3.1 Calculating Yesterday and Tomorrow
      3.2 Finding Last Friday
      3.3 Calculating Time Periods in a Date Range
      3.4 Summing Durations of Songs
      3.5 Calculating the Number of Weekdays Between Two Dates
      3.6 Looking up Holidays Automatically
      3.7 Fuzzy Parsing of Dates
      3.8 Checking Whether Daylight Saving Time Is Currently in Effect
      3.9 Converting Time Zones
      3.10 Running a Command Repeatedly
      3.11 Scheduling Commands
      3.12 Doing Decimal Arithmetic
      3.13 Formatting Decimals as Currency
      3.14 Using Python as a Simple Adding Machine
      3.15 Checking a Credit Card Checksum
      3.16 Watching Foreign Exchange Rates

4. Python Shortcuts
      4.1 Copying an Object
      4.2 Constructing Lists with List Comprehensions
      4.3 Returning an Element of a List If It Exists
      4.4 Looping over Items and Their Indices in a Sequence
      4.5 Creating Lists of Lists Without Sharing References
      4.6 Flattening a Nested Sequence
      4.7 Removing or Reordering Columns in a List of Rows
      4.8 Transposing Two-Dimensional Arrays
      4.9 Getting a Value from a Dictionary
      4.10 Adding an Entry to a Dictionary
      4.11 Building a Dictionary Without Excessive Quoting
      4.12 Building a Dict from a List of Alternating Keys and Values
      4.13 Extracting a Subset of a Dictionary
      4.14 Inverting a Dictionary
      4.15 Associating Multiple Values with Each Key in a Dictionary
      4.16 Using a Dictionary to Dispatch Methods or Functions
      4.17 Finding Unions and Intersections of Dictionaries
      4.18 Collecting a Bunch of Named Items
      4.19 Assigning and Testing with One Statement
      4.20 Using printf in Python
      4.21 Randomly Picking Items with Given Probabilities
      4.22 Handling Exceptions Within an Expression
      4.23 Ensuring a Name Is Defined in a Given Module

5. Searching and Sorting
      5.1 Sorting a Dictionary
      5.2 Sorting a List of Strings Case-Insensitively
      5.3 Sorting a List of Objects by an Attribute of the Objects
      5.4 Sorting Keys or Indices Based on the Corresponding Values
      5.5 Sorting Strings with Embedded Numbers
      5.6 Processing All of a List's Items in Random Order
      5.7 Keeping a Sequence Ordered as Items Are Added
      5.8 Getting the First Few Smallest Items of a Sequence
      5.9 Looking for Items in a Sorted Sequence
      5.10 Selecting the nth Smallest Element of a Sequence
      5.11 Showing off quicksort in Three Lines
      5.12 Performing Frequent Membership Tests on a Sequence
      5.13 Finding Subsequences
      5.14 Enriching the Dictionary Type with Ratings Functionality
      5.15 Sorting Names and Separating Them by Initials

6. Object-Oriented Programming
      6.1 Converting Among Temperature Scales
      6.2 Defining Constants
      6.3 Restricting Attribute Setting
      6.4 Chaining Dictionary Lookups
      6.5 Delegating Automatically as an Alternative to Inheritance
      6.6 Delegating Special Methods in Proxies
      6.7 Implementing Tuples with Named Items
      6.8 Avoiding Boilerplate Accessors for Properties
      6.9 Making a Fast Copy of an Object
      6.10 Keeping References to Bound MethodsWithout Inhibiting Garbage Collection
      6.11 Implementing a Ring Buffer
      6.12 Checking an Instance for Any State Changes
      6.13 Checking Whether an Object Has Necessary Attributes
      6.14 Implementing the State Design Pattern
      6.15 Implementing the "Singleton" Design Pattern
      6.16 Avoiding the "Singleton" Design Pattern with the Borg Idiom
      6.17 Implementing the Null Object Design Pattern
      6.18 Automatically Initializing Instance Variablesfrom _ _init_ _ Arguments
      6.19 Calling a Superclass _ _init_ _ Method If It Exists
      6.20 Using Cooperative Supercalls Concisely and Safely

7. Persistence and Databases
      7.1 Serializing Data Using the marshal Module
      7.2 Serializing Data Using the pickle and cPickle Modules
      7.3 Using Compression with Pickling
      7.4 Using the cPickle Module on Classes and Instances
      7.5 Holding Bound Methods in a Picklable Way
      7.6 Pickling Code Objects
      7.7 Mutating Objects with shelve
      7.8 Using the Berkeley DB Database
      7.9 Accesssing a MySQL Database
      7.10 Storing a BLOB in a MySQL Database
      7.11 Storing a BLOB in a PostgreSQL Database
      7.12 Storing a BLOB in a SQLite Database
      7.13 Generating a Dictionary Mapping Field Names to Column Numbers
      7.14 Using dtuple for Flexible Accessto Query Results
      7.15 Pretty-Printing the Contents of Database Cursors
      7.16 Using a Single Parameter-Passing StyleAcross Various DB API Modules
      7.17 Using Microsoft Jet via ADO
      7.18 Accessing a JDBC Database from a Jython Servlet
      7.19 Using ODBC to Get Excel Data with Jython

8. Debugging and Testing
      8.1 Disabling Execution of Some Conditionals and Loops
      8.2 Measuring Memory Usage on Linux
      8.3 Debugging the Garbage-Collection Process
      8.4 Trapping and Recording Exceptions
      8.5 Tracing Expressions and Comments in Debug Mode
      8.6 Getting More Information from Tracebacks
      8.7 Starting the Debugger Automatically After an Uncaught Exception
      8.8 Running Unit Tests Most Simply
      8.9 Running Unit Tests Automatically
      8.10 Using doctest with unittest in Python 2.4
      8.11 Checking Values Against Intervals in Unit Testing

9. Processes, Threads, and Synchronization
      9.1 Synchronizing All Methods in an Object
      9.2 Terminating a Thread
      9.3 Using a Queue.Queue as a Priority Queue
      9.4 Working with a Thread Pool
      9.5 Executing a Function in Parallel on Multiple Argument Sets
      9.6 Coordinating Threads by Simple Message Passing
      9.7 Storing Per-Thread Information
      9.8 Multitasking Cooperatively Without Threads
      9.9 Determining Whether Another Instance of a ScriptIs Already Running in Windows
      9.10 Processing Windows Messages Using MsgWaitForMultipleObjects
      9.11 Driving an External Process with popen
      9.12 Capturing the Output and Error Streamsfrom a Unix Shell Command
      9.13 Forking a Daemon Process on Unix

10. System Administration
      10.1 Generating Random Passwords
      10.2 Generating Easily Remembered Somewhat-Random Passwords
      10.3 Authenticating Users by Means of a POP Server
      10.4 Calculating Apache Hits per IP Address
      10.5 Calculating the Rate of Client Cache Hits on Apache
      10.6 Spawning an Editor from a Script
      10.7 Backing Up Files
      10.8 Selectively Copying a Mailbox File
      10.9 Building a Whitelist of Email Addresses From a Mailbox
      10.10 Blocking Duplicate Mails
      10.11 Checking Your Windows Sound System
      10.12 Registering or Unregistering a DLL on Windows
      10.13 Checking and Modifying the Set of Tasks WindowsAutomatically Runs at Login
      10.14 Creating a Share on Windows
      10.15 Connecting to an Already Running Instance of Internet Explorer
      10.16 Reading Microsoft Outlook Contacts
      10.17 Gathering Detailed System Information on Mac OS X

11. User Interfaces
      11.1 Showing a Progress Indicator on a Text Console
      11.2 Avoiding lambda in Writing Callback Functions
      11.3 Using Default Values and Bounds with tkSimpleDialog Functions
      11.4 Adding Drag and Drop Reordering to a Tkinter Listbox
      11.5 Entering Accented Characters in Tkinter Widgets
      11.6 Embedding Inline GIFs Using Tkinter
      11.7 Converting Among Image Formats
      11.8 Implementing a Stopwatch in Tkinter
      11.9 Combining GUIs and Asynchronous I/O with Threads
      11.10 Using IDLE's Tree Widget in Tkinter
      11.11 Supporting Multiple Values per Row in a Tkinter Listbox
      11.12 Copying Geometry Methods and Options Between Tkinter Widgets
      11.13 Implementing a Tabbed Notebook for Tkinter
      11.14 Using a wxPython Notebook with Panels
      11.15 Implementing an ImageJ Plug-in in Jython
      11.16 Viewing an Image from a URL with Swing and Jython
      11.17 Getting User Input on Mac OS
      11.18 Building a Python Cocoa GUI Programmatically
      11.19 Implementing Fade-in Windows with IronPython

12. Processing XML
      12.1 Checking XML Well-Formedness
      12.2 Counting Tags in a Document
      12.3 Extracting Text from an XML Document
      12.4 Autodetecting XML Encoding
      12.5 Converting an XML Document into a Tree of Python Objects
      12.6 Removing Whitespace-only Text Nodesfrom an XML DOM Node's Subtree
      12.7 Parsing Microsoft Excel's XML
      12.8 Validating XML Documents
      12.9 Filtering Elements and Attributes Belonging to a Given Namespace
      12.10 Merging Continuous Text Events with a SAX Filter
      12.11 Using MSHTML to Parse XML or HTML

13. Network Programming
      13.1 Passing Messages with Socket Datagrams
      13.2 Grabbing a Document from the Web
      13.3 Filtering a List of FTP Sites
      13.4 Getting Time from a Server via the SNTP Protocol
      13.5 Sending HTML Mail
      13.6 Bundling Files in a MIME Message
      13.7 Unpacking a Multipart MIME Message
      13.8 Removing Attachments from an Email Message
      13.9 Fixing Messages Parsed by Python 2.4 email.FeedParser
      13.10 Inspecting a POP3 Mailbox Interactively
      13.11 Detecting Inactive Computers
      13.12 Monitoring a Network with HTTP
      13.13 Forwarding and Redirecting Network Ports
      13.14 Tunneling SSL Through a Proxy
      13.15 Implementing the Dynamic IP Protocol
      13.16 Connecting to IRC and Logging Messages to Disk
      13.17 Accessing LDAP Servers

14. Web Programming
      14.1 Testing Whether CGI Is Working
      14.2 Handling URLs Within a CGI Script
      14.3 Uploading Files with CGI
      14.4 Checking for a Web Page's Existence
      14.5 Checking Content Type via HTTP
      14.6 Resuming the HTTP Download of a File
      14.7 Handling Cookies While Fetching Web Pages
      14.8 Authenticating with a Proxy for HTTPS Navigation
      14.9 Running a Servlet with Jython
      14.10 Finding an Internet Explorer Cookie
      14.11 Generating OPML Files
      14.12 Aggregating RSS Feeds
      14.13 Turning Data into Web Pages Through Templates
      14.14 Rendering Arbitrary Objects with Nevow

15. Distributed Programming
      15.1 Making an XML-RPC Method Call
      15.2 Serving XML-RPC Requests
      15.3 Using XML-RPC with Medusa
      15.4 Enabling an XML-RPC Server to Be Terminated Remotely
      15.5 Implementing SimpleXMLRPCServer Niceties
      15.6 Giving an XML-RPC Server a wxPython GUI
      15.7 Using Twisted Perspective Broker
      15.8 Implementing a CORBA Server and Client
      15.9 Performing Remote Logins Using telnetlib
      15.10 Performing Remote Logins with SSH
      15.11 Authenticating an SSL Client over HTTPS

16. Programs About Programs
      16.1 Verifying Whether a String Represents a Valid Number
      16.2 Importing a Dynamically Generated Module
      16.3 Importing from a Module Whose Name Is Determined at Runtime
      16.4 Associating Parameters with a Function (Currying)
      16.5 Composing Functions
      16.6 Colorizing Python Source Using the Built-in Tokenizer
      16.7 Merging and Splitting Tokens
      16.8 Checking Whether a String Has Balanced Parentheses
      16.9 Simulating Enumerations in Python
      16.10 Referring to a List Comprehension While Building It
      16.11 Automating the py2exe Compilationof Scripts into Windows Executables
      16.12 Binding Main Script and Modules into One Executable on Unix

17. Extending and Embedding
      17.1 Implementing a Simple Extension Type
      17.2 Implementing a Simple Extension Type with Pyrex
      17.3 Exposing a C++ Library to Python
      17.4 Calling Functions from a Windows DLL
      17.5 Using SWIG-Generated Modules in a Multithreaded Environment
      17.6 Translating a Python Sequence into a C Arraywith the PySequence_Fast Protocol
      17.7 Accessing a Python Sequence Item-by-Item with the Iterator Protocol
      17.8 Returning None from a Python-Callable C Function
      17.9 Debugging Dynamically Loaded C Extensions with gdb
      17.10 Debugging Memory Problems

18. Algorithms
      18.1 Removing Duplicates from a Sequence
      18.2 Removing Duplicates from a SequenceWhile Maintaining Sequence Order
      18.3 Generating Random Samples with Replacement
      18.4 Generating Random Samples Without Replacement
      18.5 Memoizing (Caching) the Return Values of Functions
      18.6 Implementing a FIFO Container
      18.7 Caching Objects with a FIFO Pruning Strategy
      18.8 Implementing a Bag (Multiset) Collection Type
      18.9 Simulating the Ternary Operator in Python
      18.10 Computing Prime Numbers
      18.11 Formatting Integers as Binary Strings
      18.12 Formatting Integers as Strings in Arbitrary Bases
      18.13 Converting Numbers to Rationals via Farey Fractions
      18.14 Doing Arithmetic with Error Propagation
      18.15 Summing Numbers with Maximal Accuracy
      18.16 Simulating Floating Point
      18.17 Computing the Convex Hulls and Diameters of 2D Point Sets

19. Iterators and Generators
      19.1 Writing a range-like Function with Float Increments
      19.2 Building a List from Any Iterable
      19.3 Generating the Fibonacci Sequence
      19.4 Unpacking a Few Items in a Multiple Assignment
      19.5 Automatically Unpacking the Needed Number of Items
      19.6 Dividing an Iterable into n Slices of Stride n
      19.7 Looping on a Sequence by Overlapping Windows
      19.8 Looping Through Multiple Iterables in Parallel
      19.9 Looping Through the Cross-Product of Multiple Iterables
      19.10 Reading a Text File by Paragraphs
      19.11 Reading Lines with Continuation Characters
      19.12 Iterating on a Stream of Data Blocks as a Stream of Lines
      19.13 Fetching Large Record Sets from a Database with a Generator
      19.14 Merging Sorted Sequences
      19.15 Generating Permutations, Combinations, and Selections
      19.16 Generating the Partitions of an Integer
      19.17 Duplicating an Iterator
      19.18 Looking Ahead into an Iterator
      19.19 Simplifying Queue-Consumer Threads
      19.20 Running an Iterator in Another Thread
      19.21 Computing a Summary Report with itertools.groupby

20. Descriptors, Decorators, and Metaclasses
      20.1 Getting Fresh Default Values at Each Function Call
      20.2 Coding Properties as Nested Functions
      20.3 Aliasing Attribute Values
      20.4 Caching Attribute Values
      20.5 Using One Method as Accessor for Multiple Attributes
      20.6 Adding Functionality to a Class by Wrapping a Method
      20.7 Adding Functionality to a Class by Enriching All Methods
      20.8 Adding a Method to a Class Instance at Runtime
      20.9 Checking Whether Interfaces Are Implemented
      20.10 Using _ _new_ _ and _ _init_ _ Appropriately in Custom Metaclasses
      20.11 Allowing Chaining of Mutating List Methods
      20.12 Using Cooperative Supercalls with Terser Syntax
      20.13 Initializing Instance Attributes Without Using _ _init_ _
      20.14 Automatic Initialization of Instance Attributes
      20.15 Upgrading Class Instances Automatically on reload
      20.16 Binding Constants at Compile Time
      20.17 Solving Metaclass Conflicts

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