OReilly Python Pocket Reference 5th
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Python is a general-purpose, multiparadigm, open source computer programming language, with support for object-oriented, functional, and procedural coding structures. It is commonly used both for standalone programs and for scripting applications in a wide variety of domains, and is generally considered to be one of the most widely used programming languages in the world.
Among Pythons features are an emphasis on code readability and library functionality, and a design that optimizes developer productivity, software quality, program portability, and component integration. Python programs run on most platforms in common use, including Unix and Linux, Windows and Macintosh, Java and .NET, Android and iOS, and more.
This pocket reference summarizes Python types and statements, special method names, built-in functions and exceptions, commonly used standard library modules, and other prominent Python tools. It is intended to serve as a concise reference tool for developers and is designed to be a companion to other books that provide tutorials, code examples, and other learning materials.
This fifth edition covers both Python 3.X and 2.X. It focuses primarily on 3.X, but also documents differences in 2.X along the way. Specifically, this edition has been updated to be current with Python versions 3.3 and 2.7 as well as prominent enhancements in the imminent 3.4 release, although most of its content also applies both to earlier and to later releases in the 3.X and 2.X lines.
This edition also applies to all major implementations of Pythonincluding CPython, PyPy, Jython, IronPython, and Stacklessand has been updated and expanded for recent changes in language, libraries, and practice. Its changes include new coverage of the MRO and super(); formal algorithms of inheritance, imports, context managers, and block indentation; and commonly used library modules and tools, including json, timeit, random, subprocess, enum, and the new Windows launcher.
The following notational conventions are used in this book:
[]In syntax formats, items in brackets are optional; brackets are also used literally in some parts of Pythons syntax as noted where applicable (e.g., lists).
*In syntax formats, items followed by an asterisk can be repeated zero or more times; star is also used literally in some parts of Pythons syntax (e.g., multiplication).
a|bIn syntax formats, items separated by a bar are alternatives; bar is also used literally in some parts of Pythons syntax (e.g., union).
ItalicUsed for filenames and URLs, and to highlight new or important terms.
Constant widthUsed for code, commands, and command-line options, and to indicate the names of modules, functions, attributes, variables, and methods.
Constant width italicUsed for replaceable parameter names in the syntax of command lines, expressions, functions, and methods.
Function()Except where noted, callable functions and methods are denoted by trailing parentheses, to distinguish them from other types of attributes.
See Section Header NameReferences to other sections in this book are given by section header text in double quotes.
In this book, 3.X and 2.X mean that a topic applies to all commonly used releases in a Python line. More specific release numbers are used for topics of more limited scope (e.g., 2.7 means 2.7 only). Because future Python changes can invalidate applicability to future releases, also see Pythons Whats New documents, currently maintained at http://docs.python.org/3/whatsnew/index.html for Pythons released after this book.
Command lines used to launch Python programs from a system shell have the following format:
python [option*] [ scriptfile | -c command | -m module | - ] [arg*] In this format, python denotes the Python interpreter executable with either a full directory path, or the word python that is resolved by the system shell (e.g., via PATH settings). Command-line options intended for Python itself appear before the specification of the program code to be run (option). Arguments intended for the code to be run appear after the program specification (arg).
The option items in ahead for 2.X differences):
-bIssue warnings for calling str() with a bytes or bytearray object and no encoding argument, and comparing a bytes or bytearray with a str. Option -bb issues errors instead.
-BDo not write .pyc or .pyo byte-code files on imports.
-dTurn on parser debugging output (for developers of the Python core).
-EIgnore Python environment variables described ahead (such as PYTHONPATH).
-hPrint help message and exit.
-iEnter interactive mode after executing a script. Hint: useful for postmortem debugging; see also pdb.pm(), described in Pythons library manuals.
-OOptimize generated byte code (create and use .pyo byte-code files). Currently yields a minor performance improvement.
-OOOperates like -O, the previous option, but also removes docstrings from byte code.
-qDo not print version and copyright message on interactive startup (as of Python 3.2).
-sDo not add the user site directory to the sys.path module search path.
-SDo not imply import site on initialization.
-uForce stdout and stderr to be unbuffered and binary.
-vPrint a message each time a module is initialized, showing the place from which it is loaded; repeat this flag for more verbose output.
-VPrint Python version number and exit (also available as --version).
-WargWarnings control: arg takes the form action:message:category:module:lineno. ).
-xSkip first line of source, allowing use of non-Unix forms of #!cmd.
-XoptionSet implementation-specific option (as of Python 3.2); see implementation documentation for supported option values.
Code to be run and command-line arguments to send to it are specified in the following ways in Python command lines:
scriptfileDenotes the name of a Python script file to run as the main, topmost file of a program (e.g., pythonmain.py runs the code in main.py). The scripts name may be an absolute or relative (to .) filename path, and is made available in sys.argv[0]. On some platforms, command lines may also omit the
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