Python Cookbook
Python Cookbook
ISBN: 0596007973
EAN: 2147483647
EAN: 2147483647
Year: 2004
Pages: 420
Pages: 420
- Python Cookbook, 2nd Edition
- Table of Contents
- Copyright
- Preface
- The Design of the Book
- The Implementation of the Book
- Using the Code from This Book
- Audience
- Organization
- Further Reading
- Conventions Used in This Book
- How to Contact Us
- Safari Enabled
- Acknowledgments
- Chapter 1. Text
- Introduction
- Recipe1.1.Processing a String One Character at a Time
- Recipe1.2.Converting Between Characters and Numeric Codes
- Recipe1.3.Testing Whether an Object Is String-like
- Recipe1.4.Aligning Strings
- Recipe1.5.Trimming Space from the Ends of a String
- Recipe1.6.Combining Strings
- Recipe1.7.Reversing a String by Words or Characters
- Recipe1.8.Checking Whether a String Contains a Set of Characters
- Recipe1.9.Simplifying Usage of Strings translate Method
- Recipe1.10.Filtering a String for a Set of Characters
- Recipe1.11.Checking Whether a String Is Text or Binary
- Recipe1.12.Controlling Case
- Recipe1.13.Accessing Substrings
- Recipe1.14.Changing the Indentation of a Multiline String
- Recipe1.15.Expanding and Compressing Tabs
- Recipe1.16.Interpolating Variables in a String
- Recipe1.17.Interpolating Variables in a Stringin Python 2.4
- Recipe1.18.Replacing Multiple Patterns in a Single Pass
- Recipe1.19.Checking a String for Any of Multiple Endings
- Recipe1.20.Handling International Text with Unicode
- Recipe1.21.Converting Between Unicode and Plain Strings
- Recipe1.22.Printing Unicode Charactersto Standard Output
- Recipe1.23.Encoding Unicode Data for XML and HTML
- Recipe1.24.Making Some Strings Case-Insensitive
- Recipe1.25.Converting HTML Documents to Texton a Unix Terminal
- Chapter 2. Files
- Introduction
- Recipe2.1.Reading from a File
- Recipe2.2.Writing to a File
- Recipe2.3.Searching and Replacing Text in a File
- Recipe2.4.Reading a Specific Line from a File
- Recipe2.5.Counting Lines in a File
- Recipe2.6.Processing Every Word in a File
- Recipe2.7.Using Random-Access InputOutput
- Recipe2.8.Updating a Random-Access File
- Recipe2.9.Reading Data from zip Files
- Recipe2.10.Handling a zip File Inside a String
- Recipe2.11.Archiving a Tree of Files into a Compressed tar File
- Recipe2.12.Sending Binary Data to Standard Output Under Windows
- Recipe2.13.Using a C-like iostream Syntax
- Recipe2.14.Rewinding an Input File to the Beginning
- Recipe2.15.Adapting a File-like Object to a True File Object
- Recipe2.16.Walking Directory Trees
- Recipe2.17.Swapping One File Extension for Another Throughout a Directory Tree
- Recipe2.18.Finding a File Given a Search Path
- Recipe2.19.Finding Files Given a Search Path and a Pattern
- Recipe2.20.Finding a File on the Python Search Path
- Recipe2.21.Dynamically Changing the PythonSearch Path
- Recipe2.22.Computing the Relative Path from One Directory to Another
- Recipe2.23.Reading an Unbuffered Character in a Cross-Platform Way
- Recipe2.24.Counting Pages of PDF Documents on Mac OS X
- Recipe2.25.Changing File Attributes on Windows
- Recipe2.26.Extracting Text from OpenOffice.org Documents
- Recipe2.27.Extracting Text from Microsoft Word Documents
- Recipe2.28.File Locking Using a Cross-Platform API
- Recipe2.29.Versioning Filenames
- Recipe2.30.Calculating CRC-64 Cyclic Redundancy Checks
- Chapter 3. Time and Money
- Introduction
- Recipe3.1.Calculating Yesterday and Tomorrow
- Recipe3.2.Finding Last Friday
- Recipe3.3.Calculating Time Periods in a Date Range
- Recipe3.4.Summing Durations of Songs
- Recipe3.5.Calculating the Number of Weekdays Between Two Dates
- Recipe3.6.Looking up Holidays Automatically
- Recipe3.7.Fuzzy Parsing of Dates
- Recipe3.8.Checking Whether Daylight Saving Time Is Currently in Effect
- Recipe3.9.Converting Time Zones
- Recipe3.10.Running a Command Repeatedly
- Recipe3.11.Scheduling Commands
- Recipe3.12.Doing Decimal Arithmetic
- Recipe3.13.Formatting Decimals as Currency
- Recipe3.14.Using Python as a Simple Adding Machine
- Recipe3.15.Checking a Credit Card Checksum
- Recipe3.16.Watching Foreign Exchange Rates
- Chapter 4. Python Shortcuts
- Introduction
- Recipe4.1.Copying an Object
- Recipe4.2.Constructing Lists with List Comprehensions
- Recipe4.3.Returning an Element of a List If It Exists
- Recipe4.4.Looping over Items and Their Indices in a Sequence
- Recipe4.5.Creating Lists of Lists Without Sharing References
- Recipe4.6.Flattening a Nested Sequence
- Recipe4.7.Removing or Reordering Columnsin a List of Rows
- Recipe4.8.Transposing Two-Dimensional Arrays
- Recipe4.9.Getting a Value from a Dictionary
- Recipe4.10.Adding an Entry to a Dictionary
- Recipe4.11.Building a Dictionary Without Excessive Quoting
- Recipe4.12.Building a Dict from a List of Alternating Keys and Values
- Recipe4.13.Extracting a Subset of a Dictionary
- Recipe4.14.Inverting a Dictionary
- Recipe4.15.Associating Multiple Values with Each Key in a Dictionary
- Recipe4.16.Using a Dictionary to Dispatch Methods or Functions
- Recipe4.17.Finding Unions and Intersections of Dictionaries
- Recipe4.18.Collecting a Bunch of Named Items
- Recipe4.19.Assigning and Testing with One Statement
- Recipe4.20.Using printf in Python
- Recipe4.21.Randomly Picking Items with Given Probabilities
- Recipe4.22.Handling Exceptions Within an Expression
- Recipe4.23.Ensuring a Name Is Defined in a Given Module
- Chapter 5. Searching and Sorting
- Introduction
- Recipe5.1.Sorting a Dictionary
- Recipe5.2.Sorting a List of Strings Case-Insensitively
- Recipe5.3.Sorting a List of Objects by an Attribute of the Objects
- Recipe5.4.Sorting Keys or Indices Basedon the Corresponding Values
- Recipe5.5.Sorting Strings with Embedded Numbers
- Recipe5.6.Processing All of a List s Items in Random Order
- Recipe5.7.Keeping a Sequence Ordered as Items Are Added
- Recipe5.8.Getting the First Few Smallest Items of a Sequence
- Recipe5.9.Looking for Items in a Sorted Sequence
- Recipe5.10.Selecting the nth Smallest Element of a Sequence
- Recipe5.11.Showing off quicksort in Three Lines
- Recipe5.12.Performing Frequent Membership Tests on a Sequence
- Recipe5.13.Finding Subsequences
- Recipe5.14.Enriching the Dictionary Type with Ratings Functionality
- Recipe5.15.Sorting Names and Separating Them by Initials
- Chapter 6. Object-Oriented Programming
- Introduction
- Recipe6.1.Converting Among Temperature Scales
- Recipe6.2.Defining Constants
- Recipe6.3.Restricting Attribute Setting
- Recipe6.4.Chaining Dictionary Lookups
- Recipe6.5.Delegating Automatically as an Alternative to Inheritance
- Recipe6.6.Delegating Special Methods in Proxies
- Recipe6.7.Implementing Tuples with Named Items
- Recipe6.8.Avoiding Boilerplate Accessors for Properties
- Recipe6.9.Making a Fast Copy of an Object
- Recipe6.10.Keeping References to Bound Methods Without Inhibiting Garbage Collection
- Recipe6.11.Implementing a Ring Buffer
- Recipe6.12.Checking an Instance for Any State Changes
- Recipe6.13.Checking Whether an Object Has Necessary Attributes
- Recipe6.14.Implementing the State Design Pattern
- Recipe6.15.Implementing the
- Recipe6.16.Avoiding the
- Recipe6.17.Implementing the Null Object Design Pattern
- Recipe6.18.Automatically Initializing Instance Variables from _ _init_ _ Arguments
- Recipe6.19.Calling a Superclass _ _init_ _ Method If It Exists
- Recipe6.20.Using Cooperative Supercalls Concisely and Safely
- Chapter 7. Persistence and Databases
- Introduction
- Recipe7.1.Serializing Data Using the marshal Module
- Recipe7.2.Serializing Data Using the pickle and cPickle Modules
- Recipe7.3.Using Compression with Pickling
- Recipe7.4.Using the cPickle Module on Classes and Instances
- Recipe7.5.Holding Bound Methods in a Picklable Way
- Recipe7.6.Pickling Code Objects
- Recipe7.7.Mutating Objects with shelve
- Recipe7.8.Using the Berkeley DB Database
- Recipe7.9.Accesssing a MySQL Database
- Recipe7.10.Storing a BLOB in a MySQL Database
- Recipe7.11.Storing a BLOB in a PostgreSQL Database
- Recipe7.12.Storing a BLOB in a SQLite Database
- Recipe7.13.Generating a Dictionary Mapping Field Names to Column Numbers
- Recipe7.14.Using dtuple for Flexible Accessto Query Results
- Recipe7.15.Pretty-Printing the Contents of Database Cursors
- Recipe7.16.Using a Single Parameter-Passing Style Across Various DB API Modules
- Recipe7.17.Using Microsoft Jet via ADO
- Recipe7.18.Accessing a JDBC Database from a Jython Servlet
- Recipe7.19.Using ODBC to Get Excel Data with Jython
- Chapter 8. Debugging and Testing
- Introduction
- Recipe8.1.Disabling Execution of Some Conditionals and Loops
- Recipe8.2.Measuring Memory Usage on Linux
- Recipe8.3.Debugging the Garbage-Collection Process
- Recipe8.4.Trapping and Recording Exceptions
- Recipe8.5.Tracing Expressions and Comments in Debug Mode
- Recipe8.6.Getting More Information from Tracebacks
- Recipe8.7.Starting the Debugger Automatically After an Uncaught Exception
- Recipe8.8.Running Unit Tests Most Simply
- Recipe8.9.Running Unit Tests Automatically
- Recipe8.10.Using doctest with unittest in Python 2.4
- Recipe8.11.Checking Values Against Intervals in Unit Testing
- Chapter 9. Processes, Threads, and Synchronization
- Introduction
- Recipe9.1.Synchronizing All Methods in an Object
- Recipe9.2.Terminating a Thread
- Recipe9.3.Using a Queue.Queue as a Priority Queue
- Recipe9.4.Working with a Thread Pool
- Recipe9.5.Executing a Function in Parallel on Multiple Argument Sets
- Recipe9.6.Coordinating Threads by Simple Message Passing
- Recipe9.7.Storing Per-Thread Information
- Recipe9.8.Multitasking Cooperatively Without Threads
- Recipe9.9.Determining Whether Another Instanceof a Script Is Already Running in Windows
- Recipe9.10.Processing Windows Messages Using MsgWaitForMultipleObjects
- Recipe9.11.Driving an External Process with popen
- Recipe9.12.Capturing the Output and Error Streams from a Unix Shell Command
- Recipe9.13.Forking a Daemon Process on Unix
- Chapter 10. System Administration
- Introduction
- Recipe10.1.Generating Random Passwords
- Recipe10.2.Generating Easily Remembered Somewhat-Random Passwords
- Recipe10.3.Authenticating Users by Means of a POP Server
- Recipe10.4.Calculating Apache Hits per IP Address
- Recipe10.5.Calculating the Rate of Client Cache Hits on Apache
- Recipe10.6.Spawning an Editor from a Script
- Recipe10.7.Backing Up Files
- Recipe10.8.Selectively Copying a Mailbox File
- Recipe10.9.Building a Whitelist of Email Addresses From a Mailbox
- Recipe10.10.Blocking Duplicate Mails
- Recipe10.11.Checking Your Windows Sound System
- Recipe10.12.Registering or Unregistering a DLL on Windows
- Recipe10.13.Checking and Modifying the Set of Tasks Windows Automatically Runs at Login
- Recipe10.14.Creating a Share on Windows
- Recipe10.15.Connecting to an Already Running Instance of Internet Explorer
- Recipe10.16.Reading Microsoft Outlook Contacts
- Recipe10.17.Gathering Detailed System Informationon Mac OS X
- Chapter 11. User Interfaces
- Introduction
- Recipe11.1.Showing a Progress Indicator on a Text Console
- Recipe11.2.Avoiding lambda in Writing Callback Functions
- Recipe11.3.Using Default Values and Bounds with tkSimpleDialog Functions
- Recipe11.4.Adding Drag and Drop Reordering to a Tkinter Listbox
- Recipe11.5.Entering Accented Characters in Tkinter Widgets
- Recipe11.6.Embedding Inline GIFs Using Tkinter
- Recipe11.7.Converting Among Image Formats
- Recipe11.8.Implementing a Stopwatch in Tkinter
- Recipe11.9.Combining GUIs and Asynchronous IOwith Threads
- Recipe11.10.Using IDLE s Tree Widget in Tkinter
- Recipe11.11.Supporting Multiple Values per Row in a Tkinter Listbox
- Recipe11.12.Copying Geometry Methods and Options Between Tkinter Widgets
- Recipe11.13.Implementing a Tabbed Notebook for Tkinter
- Recipe11.14.Using a wxPython Notebook with Panels
- Recipe11.15.Implementing an ImageJ Plug-in in Jython
- Recipe11.16.Viewing an Image from a URL with Swing and Jython
- Recipe11.17.Getting User Input on Mac OS
- Recipe11.18.Building a Python Cocoa GUI Programmatically
- Recipe11.19.Implementing Fade-in Windows with IronPython
- Chapter 12. Processing XML
- Introduction
- Recipe12.1.Checking XML Well-Formedness
- Recipe12.2.Counting Tags in a Document
- Recipe12.3.Extracting Text from an XML Document
- Recipe12.4.Autodetecting XML Encoding
- Recipe12.5.Converting an XML Document into a Tree of Python Objects
- Recipe12.6.Removing Whitespace-only Text Nodes from an XML DOM Node s Subtree
- Recipe12.7.Parsing Microsoft Excel s XML
- Recipe12.8.Validating XML Documents
- Recipe12.9.Filtering Elements and Attributes Belonging to a Given Namespace
- Recipe12.10.Merging Continuous Text Events with a SAX Filter
- Recipe12.11.Using MSHTML to Parse XML or HTML
- Chapter 13. Network Programming
- Introduction
- Recipe13.1.Passing Messages with Socket Datagrams
- Recipe13.2.Grabbing a Document from the Web
- Recipe13.3.Filtering a List of FTP Sites
- Recipe13.4.Getting Time from a Server via the SNTP Protocol
- Recipe13.5.Sending HTML Mail
- Recipe13.6.Bundling Files in a MIME Message
- Recipe13.7.Unpacking a Multipart MIME Message
- Recipe13.8.Removing Attachments from an Email Message
- Recipe13.9.Fixing Messages Parsed by Python 2.4 email.FeedParser
- Recipe13.10.Inspecting a POP3 Mailbox Interactively
- Recipe13.11.Detecting Inactive Computers
- Recipe13.12.Monitoring a Network with HTTP
- Recipe13.13.Forwarding and Redirecting Network Ports
- Recipe13.14.Tunneling SSL Through a Proxy
- Recipe13.15.Implementing the Dynamic IP Protocol
- Recipe13.16.Connecting to IRC and Logging Messages to Disk
- Recipe13.17.Accessing LDAP Servers
- Chapter 14. Web Programming
- Introduction
- Recipe14.1.Testing Whether CGI Is Working
- Recipe14.2.Handling URLs Within a CGI Script
- Recipe14.3.Uploading Files with CGI
- Recipe14.4.Checking for a Web Page s Existence
- Recipe14.5.Checking Content Type via HTTP
- Recipe14.6.Resuming the HTTP Download of a File
- Recipe14.7.Handling Cookies While Fetching Web Pages
- Recipe14.8.Authenticating with a Proxy for HTTPS Navigation
- Recipe14.9.Running a Servlet with Jython
- Recipe14.10.Finding an Internet Explorer Cookie
- Recipe14.11.Generating OPML Files
- Recipe14.12.Aggregating RSS Feeds
- Recipe14.13.Turning Data into Web Pages Through Templates
- Recipe14.14.Rendering Arbitrary Objects with Nevow
- Chapter 15. Distributed Programming
- Introduction
- Recipe15.1.Making an XML-RPC Method Call
- Recipe15.2.Serving XML-RPC Requests
- Recipe15.3.Using XML-RPC with Medusa
- Recipe15.4.Enabling an XML-RPC Server to Be Terminated Remotely
- Recipe15.5.Implementing SimpleXMLRPCServer Niceties
- Recipe15.6.Giving an XML-RPC Server a wxPython GUI
- Recipe15.7.Using Twisted Perspective Broker
- Recipe15.8.Implementing a CORBA Server and Client
- Recipe15.9.Performing Remote Logins Using telnetlib
- Recipe15.10.Performing Remote Logins with SSH
- Recipe15.11.Authenticating an SSL Client over HTTPS
- Chapter 16. Programs About Programs
- Introduction
- Recipe16.1.Verifying Whether a String Represents a Valid Number
- Recipe16.2.Importing a Dynamically Generated Module
- Recipe16.3.Importing from a Module Whose Name Is Determined at Runtime
- Recipe16.4.Associating Parameters with a Function (Currying)
- Recipe16.5.Composing Functions
- Recipe16.6.Colorizing Python Source Using the Built-in Tokenizer
- Recipe16.7.Merging and Splitting Tokens
- Recipe16.8.Checking Whether a String Has Balanced Parentheses
- Recipe16.9.Simulating Enumerations in Python
- Recipe16.10.Referring to a List Comprehension While Building It
- Recipe16.11.Automating the py2exe Compilation of Scripts into Windows Executables
- Recipe16.12.Binding Main Script and Modules into One Executable on Unix
- Chapter 17. Extending and Embedding
- Introduction
- Recipe17.1.Implementing a Simple Extension Type
- Recipe17.2.Implementing a Simple Extension Type with Pyrex
- Recipe17.3.Exposing a C Library to Python
- Recipe17.4.Calling Functions from a Windows DLL
- Recipe17.5.Using SWIG-Generated Modules in a Multithreaded Environment
- Recipe17.6.Translating a Python Sequence into a C Array with the PySequence_Fast Protocol
- Recipe17.7.Accessing a Python Sequence Item-by-Item with the Iterator Protocol
- Recipe17.8.Returning None from a Python-Callable C Function
- Recipe17.9.Debugging Dynamically Loaded C Extensions with gdb
- Recipe17.10.Debugging Memory Problems
- Chapter 18. Algorithms
- Introduction
- Recipe18.1.Removing Duplicates from a Sequence
- Recipe18.2.Removing Duplicates from a Sequence While Maintaining Sequence Order
- Recipe18.3.Generating Random Samples with Replacement
- Recipe18.4.Generating Random Samples Without Replacement
- Recipe18.5.Memoizing (Caching) the Return Values of Functions
- Recipe18.6.Implementing a FIFO Container
- Recipe18.7.Caching Objects with a FIFO Pruning Strategy
- Recipe18.8.Implementing a Bag (Multiset) Collection Type
- Recipe18.9.Simulating the Ternary Operator in Python
- Recipe18.10.Computing Prime Numbers
- Recipe18.11.Formatting Integers as Binary Strings
- Recipe18.12.Formatting Integers as Strings in Arbitrary Bases
- Recipe18.13.Converting Numbers to Rationals via Farey Fractions
- Recipe18.14.Doing Arithmetic with Error Propagation
- Recipe18.15.Summing Numbers with Maximal Accuracy
- Recipe18.16.Simulating Floating Point
- Recipe18.17.Computing the Convex Hulls and Diameters of 2D Point Sets
- Chapter 19. Iterators and Generators
- Introduction
- Recipe19.1.Writing a range-like Function with Float Increments
- Recipe19.2.Building a List from Any Iterable
- Recipe19.3.Generating the Fibonacci Sequence
- Recipe19.4.Unpacking a Few Items in a Multiple Assignment
- Recipe19.5.Automatically Unpacking the Needed Number of Items
- Recipe19.6.Dividing an Iterable into n Slices of Stride n
- Recipe19.7.Looping on a Sequence by Overlapping Windows
- Recipe19.8.Looping Through Multiple Iterables in Parallel
- Recipe19.9.Looping Through the Cross-Product of Multiple Iterables
- Recipe19.10.Reading a Text File by Paragraphs
- Recipe19.11.Reading Lines with Continuation Characters
- Recipe19.12.Iterating on a Stream of Data Blocks as a Stream of Lines
- Recipe19.13.Fetching Large Record Sets from a Database with a Generator
- Recipe19.14.Merging Sorted Sequences
- Recipe19.15.Generating Permutations, Combinations, and Selections
- Recipe19.16.Generating the Partitions of an Integer
- Recipe19.17.Duplicating an Iterator
- Recipe19.18.Looking Ahead into an Iterator
- Recipe19.19.Simplifying Queue-Consumer Threads
- Recipe19.20.Running an Iterator in Another Thread
- Recipe19.21.Computing a Summary Report with itertools.groupby
- Chapter 20. Descriptors, Decorators,and Metaclasses
- Introduction
- Recipe20.1.Getting Fresh Default Values at Each Function Call
- Recipe20.2.Coding Properties as Nested Functions
- Recipe20.3.Aliasing Attribute Values
- Recipe20.4.Caching Attribute Values
- Recipe20.5.Using One Method as Accessorfor Multiple Attributes
- Recipe20.6.Adding Functionality to a Class by Wrapping a Method
- Recipe20.7.Adding Functionality to a Class by Enriching All Methods
- Recipe20.8.Adding a Method to a Class Instance at Runtime
- Recipe20.9.Checking Whether Interfaces Are Implemented
- Recipe20.10.Using _ _new_ _ and _ _init_ _ Appropriately in Custom Metaclasses
- Recipe20.11.Allowing Chaining of Mutating List Methods
- Recipe20.12.Using Cooperative Super calls with Terser Syntax
- Recipe20.13.Initializing Instance Attributes Without Using _ _init_ _
- Recipe20.14.Automatic Initialization of Instance Attributes
- Recipe20.15.Upgrading Class Instances Automatically on reload
- Recipe20.16.Binding Constants at Compile Time
- Recipe20.17.Solving Metaclass Conflicts
- Colophon
- Index
- SYMBOL
- A
- B
- C
- D
- E
- F
- G
- H
- I
- J
- K
- L
- M
- N
- O
- P
- Q
- R
- S
- T
- U
- V
- W
- X
Python Cookbook
ISBN: 0596007973
EAN: 2147483647
EAN: 2147483647
Year: 2004
Pages: 420
Pages: 420