Index

E

Easter eggs, Software Quality

EBCDIC encoding, Other Encoding Schemes

Eclipse IDE, Other IDEs

EIBTI acronym, Don’t Abuse Generators: EIBTI–On the other hand: Space and time, conciseness, expressiveness

ElementTree package, XML Parsing Tools, XML Parsing Tools

else clause (loop blocks), break, continue, pass, and the Loop else, Loop else–More on the loop else

embedded programs, Embedding Calls

empty data structures, The Meaning of True and False in Python

empty dictionaries, Dictionaries

empty lists, Lists

empty strings, String Basics

empty tuples, Tuples

encapsulation, Polymorphism and classes, Python and OOP, Why Decorators? (Revisited)

about, Python and OOP
decorators and, Why Decorators? (Revisited)
polymorphism and, Polymorphism and classes

enclosing scope, Scope Details, Name Resolution: The LEGB Rule, Retaining Enclosing Scope State with Defaults–Arbitrary scope nesting, Enclosing scopes and loop variables: Factory functions, Function Interfaces and Callback-Based Code, Enclosing scopes and globals–Enclosing scopes and nonlocals, Coding alternatives, State retention and enclosing scopes

about, Scope Details
function-related gotchas, Enclosing scopes and loop variables: Factory functions
LEGB rule and, Name Resolution: The LEGB Rule
nonlocal statement and, Function Interfaces and Callback-Based Code, Enclosing scopes and globals–Enclosing scopes and nonlocals, Coding alternatives
retaining state with defaults, Retaining Enclosing Scope State with Defaults–Arbitrary scope nesting
state retention and, State retention and enclosing scopes

encoding and decoding, Binary Bytes Files, Unicode: The Short Story, String Basics, Escape Sequences Represent Special Characters, Character Encoding Schemes–Character Encoding Schemes, Coding Unicode Strings–Source File Character Set Encoding Declarations, Coding ASCII Text, Coding Non-ASCII Text–Encoding and Decoding Non-ASCII text, Other Encoding Schemes, Other Encoding Schemes, Byte String Literals: Encoded Text, Converting Encodings, Source File Character Set Encoding Declarations–Source File Character Set Encoding Declarations, Using Unicode Files–Stream content: PYTHONIOENCODING, Unicode Filenames and Streams

about, Character Encoding Schemes–Character Encoding Schemes
additional schemes, Other Encoding Schemes
ASCII, Escape Sequences Represent Special Characters, Coding ASCII Text
byte string literals, Byte String Literals: Encoded Text
character set declarations, Source File Character Set Encoding Declarations–Source File Character Set Encoding Declarations
converting, Converting Encodings
EBCDIC, Other Encoding Schemes
filenames, Unicode Filenames and Streams
non-ASCII text, Coding Non-ASCII Text–Encoding and Decoding Non-ASCII text
Unicode, Binary Bytes Files, Unicode: The Short Story, String Basics, Coding Unicode Strings–Source File Character Set Encoding Declarations, Using Unicode Files–Stream content: PYTHONIOENCODING

encodings module, Character Encoding Schemes

endianness, Handling the BOM in 3.X–Dropping the BOM in Python

__enter__ method, Common Operator Overloading Methods, The Context Management Protocol

enumerate built-in function, Loop Coding Techniques, Generating Both Offsets and Items: enumerate, Other Built-in Type Iterables, Other Iteration Contexts

about, Loop Coding Techniques, Generating Both Offsets and Items: enumerate
iteration and, Other Iteration Contexts
usage example, Other Built-in Type Iterables

env program, The Unix env Lookup Trick

about, Python Environment Variables–Python Environment Variables
PATH, The System Path, New Windows Options in 3.3: PATH, Launcher, Command-Line Usage Variations, The Unix env Lookup Trick, Python Environment Variables, Python Environment Variables
PYTHONIOENCODING, Stream content: PYTHONIOENCODING
PYTHONPATH, Usage Notes: import and reload, Python 3.2 and earlier: GUI client, The Module Search Path, Packages and Search Path Settings, Changing the Module Search Path, Python Environment Variables, Python Environment Variables, Windows environment variable GUI
PYTHONSTARTUP, Python Environment Variables, Python Environment Variables
PY_PYTHON, The Python 3.3 Windows Launcher: #! Comes to Windows, Python Environment Variables, Python Environment Variables
PY_PYTHON2, Python Environment Variables, Python Environment Variables
PY_PYTHON3, Python Environment Variables, Python Environment Variables
TCL_LIBRARY, Python Environment Variables
TK_LIBRARY, Python Environment Variables

EOFError exception, Exceptions Aren’t Always Errors

__eq__ method, Common Operator Overloading Methods, Comparisons: __lt__, __gt__, and Others

equality, Python Expression Operators, Shared References and Equality–Shared References and Equality, Comparisons, Equality, and Truth–Python 2.X and 3.X dictionary comparisons, Truth Values and Boolean Tests–Truth Values and Boolean Tests

built-in object types, Comparisons, Equality, and Truth–Python 2.X and 3.X dictionary comparisons
shared references and, Shared References and Equality–Shared References and Equality
testing truth values, Truth Values and Boolean Tests–Truth Values and Boolean Tests
value equality operators, Python Expression Operators

equivalence (==) operator, Comparisons, Equality, and Truth

errno module, Built-in Exception Categories

error handling, Other Icon-Click Limitations, Missing Keys: if Tests–Missing Keys: if Tests, Avoiding missing-key errors, Handling Errors by Testing Inputs, Handling Errors with try Statements–Supporting floating-point numbers, Exception Roles, Termination Actions, Displaying Errors and Tracebacks

displaying errors and tracebacks, Displaying Errors and Tracebacks
exceptions and, Exception Roles, Termination Actions
missing keys, Missing Keys: if Tests–Missing Keys: if Tests, Avoiding missing-key errors
scripts and, Other Icon-Click Limitations
testing inputs, Handling Errors by Testing Inputs
with try statements, Handling Errors with try Statements–Supporting floating-point numbers

escape sequences, Other Ways to Code Strings, String Basics, Escape Sequences Represent Special Characters–Raw Strings Suppress Escapes

etree package, XML Parsing Tools

eval built-in function, Hex, Octal, Binary: Literals and Conversions, String Conversion Tools, Storing Python Objects in Files: Conversions, Multiway branch switches: The finale

jump tables and, Multiway branch switches: The finale
strings and, Hex, Octal, Binary: Literals and Conversions, String Conversion Tools, Storing Python Objects in Files: Conversions

event notification, Exception Roles

Exception class, User-Defined Exceptions, Catching all: The empty except and Exception, Coding Exceptions Classes, Built-in Exception Classes, Built-in Exception Categories, More on sys.exc_info

about, Coding Exceptions Classes, Built-in Exception Classes
as catchall, Catching all: The empty except and Exception, Built-in Exception Categories, More on sys.exc_info
user-defined exceptions and, User-Defined Exceptions

exception classes, Exception Objects–Class-Based Exceptions, Exception Objects, Coding Exceptions Classes–Coding Exceptions Classes, Why Exception Hierarchies?–Why Exception Hierarchies?, Built-in Exception Classes–Default Printing and State, Custom Print Displays, Custom Data and Behavior–Providing Exception Methods, Test Your Knowledge: Quiz

about, Exception Objects–Class-Based Exceptions
built-in, Built-in Exception Classes–Default Printing and State
coding, Coding Exceptions Classes–Coding Exceptions Classes
custom data and behavior, Custom Data and Behavior–Providing Exception Methods
custom print displays, Custom Print Displays
hierarchies in, Why Exception Hierarchies?–Why Exception Hierarchies?
quiz questions and answers, Test Your Knowledge: Quiz
version considerations, Exception Objects

exception handlers, Why Use Exceptions?, Why Use Exceptions?, Exception Roles, Default Exception Handler, Default Exception Handler, Catching Exceptions, Termination Actions, Providing Exception Methods–Providing Exception Methods, Nesting Exception Handlers–Example: Syntactic Nesting

(see also specific statements)
about, Why Use Exceptions?
backtracking and, Exception Roles
default, Default Exception Handler
defining methods for, Providing Exception Methods–Providing Exception Methods
interactive prompt and, Catching Exceptions
nesting, Nesting Exception Handlers–Example: Syntactic Nesting
termination actions and, Default Exception Handler, Termination Actions

exception variables, Other Python scopes: Preview

exceptions, Using Keyword-Only Arguments, User-Defined Iterables, Exception Basics, Exception Basics, Why Use Exceptions?, Exception Roles, Catching Exceptions, Raising Exceptions, User-Defined Exceptions, User-Defined Exceptions, Termination Actions, Test Your Knowledge: Quiz, Exception Coding Details–Test Your Knowledge: Answers, Catching any and all exceptions–Catching all: The empty except and Exception, Example: Catching Built-in Exceptions, Example: Catching Built-in Exceptions, Raising Exceptions, Propagating Exceptions with raise, Python 3.X Exception Chaining: raise from–Python 3.X Exception Chaining: raise from, Test Your Knowledge: Quiz, Exception Objects–Test Your Knowledge: Answers, String Exceptions Are Right Out!, Default Printing and State, Exception Idioms–Displaying Errors and Tracebacks, Exceptions Aren’t Always Errors, Functions Can Signal Conditions with raise, Exception Design Tips and Gotchas–Catching Too Little: Use Class-Based Categories, Catching Too Much: Avoid Empty except and Exception–Catching Too Much: Avoid Empty except and Exception, Catching Too Little: Use Class-Based Categories, Test Your Knowledge: Quiz

(see also specific exceptions and specific statements)
about, Exception Basics
built-in, User-Defined Exceptions, Example: Catching Built-in Exceptions
catching, Catching Exceptions, Termination Actions, Catching any and all exceptions–Catching all: The empty except and Exception, Example: Catching Built-in Exceptions
catching too little, Catching Too Little: Use Class-Based Categories
catching too much, Catching Too Much: Avoid Empty except and Exception–Catching Too Much: Avoid Empty except and Exception
chaining, Python 3.X Exception Chaining: raise from–Python 3.X Exception Chaining: raise from
class-based, Exception Objects–Test Your Knowledge: Answers
coding details, Exception Coding Details–Test Your Knowledge: Answers
common roles, Exception Roles
design tips and gotchas, Exception Design Tips and Gotchas–Catching Too Little: Use Class-Based Categories
errors versus, Exceptions Aren’t Always Errors
propagating, Propagating Exceptions with raise
quiz questions and answers, Test Your Knowledge: Quiz, Test Your Knowledge: Quiz, Test Your Knowledge: Quiz
raising, Using Keyword-Only Arguments, User-Defined Iterables, Raising Exceptions, Raising Exceptions
string-based, String Exceptions Are Right Out!
usage considerations, Why Use Exceptions?, Exception Idioms–Displaying Errors and Tracebacks
user-defined, User-Defined Exceptions, Default Printing and State, Functions Can Signal Conditions with raise

exceptions module, Built-in Exception Classes

exec built-in function, Using exec to Run Module Files–Using exec to Run Module Files

execfile built-in function, Using exec to Run Module Files

executable scripts, Unix Script Basics, The Unix env Lookup Trick, The Python 3.3 Windows Launcher: #! Comes to Windows–The Python 3.3 Windows Launcher: #! Comes to Windows

#! comment in Windows, The Python 3.3 Windows Launcher: #! Comes to Windows–The Python 3.3 Windows Launcher: #! Comes to Windows
about, Unix Script Basics
env program, The Unix env Lookup Trick

executing programs, How Python Runs Programs (see program execution)

part I, Test Your Knowledge: Part I Exercises–Test Your Knowledge: Part I Exercises, Part I, Getting Started–Part I, Getting Started
part II, Test Your Knowledge: Part II Exercises–Test Your Knowledge: Part II Exercises, Part II, Types and Operations–Part II, Types and Operations
part III, Test Your Knowledge: Part III Exercises–Test Your Knowledge: Part III Exercises, Part III, Statements and Syntax–Part III, Statements and Syntax
part IV, Test Your Knowledge: Part IV Exercises–Test Your Knowledge: Part IV Exercises, Part IV, Functions and Generators–Part IV, Functions and Generators
part V, Test Your Knowledge: Part V Exercises–Test Your Knowledge: Part V Exercises, Part V, Modules and Packages–Part V, Modules and Packages
part VI, Test Your Knowledge: Part VI Exercises–Test Your Knowledge: Part VI Exercises, Part VI, Classes and OOP–Part VI, Classes and OOP
part VII, Test Your Knowledge: Part VII Exercises, Part VII, Exceptions and Tools–Part VII, Exceptions and Tools

__exit__ method, Common Operator Overloading Methods, The Context Management Protocol

explicit attributes, State with Classes: Explicit Attributes (Preview)

exponentiation operation, Numbers

expression operators, Python Expression Operators, Python Expression Operators, Mixed operators follow operator precedence, Parentheses group subexpressions, Mixed types are converted up, Preview: Operator overloading and polymorphism, Preview: Operator overloading and polymorphism, Set basics in Python 2.6 and earlier

converting mixed types, Mixed types are converted up
grouping with parentheses, Parentheses group subexpressions
listed, Python Expression Operators
operator overloading, Preview: Operator overloading and polymorphism
operator precedence, Mixed operators follow operator precedence
polymorphism and, Preview: Operator overloading and polymorphism
set operations and, Set basics in Python 2.6 and earlier
version considerations, Python Expression Operators

expressions, Running Code Interactively, The Python Conceptual Hierarchy, The Python Conceptual Hierarchy, Sequence Operations, Sequence Operations, Python Expression Operators, Python Expression Operators–Preview: Operator overloading and polymorphism, Python Expression Operators, Variables and Basic Expressions–Variables and Basic Expressions, Variables, Objects, and References, Method Call Syntax, String Formatting Expressions–Dictionary-Based Formatting Expressions, Functions versus expressions: A minor convenience, Expression Statements–Expression Statements and In-Place Changes, Expression Statements, Test Your Knowledge: Quiz, Multiple Versus Single Pass Iterators, Other Iteration Topics, Generator Functions and Expressions, Generator Expressions: Iterables Meet Comprehensions–Generator Functions Versus Generator Expressions, Constructors and Expressions: __init__ and __sub__, Intercepting Slices, Call Expressions: __call__–Function Interfaces and Callback-Based Code

(see also lambda expressions)
about, Python Expression Operators
arbitrary, Sequence Operations
call, Method Call Syntax, Call Expressions: __call__–Function Interfaces and Callback-Based Code
code examples, Running Code Interactively
expression operators, Python Expression Operators–Preview: Operator overloading and polymorphism
functions versus, Functions versus expressions: A minor convenience, Expression Statements
generator, Multiple Versus Single Pass Iterators, Other Iteration Topics, Generator Functions and Expressions, Generator Expressions: Iterables Meet Comprehensions–Generator Functions Versus Generator Expressions
indexing, Sequence Operations
numbers in, Variables and Basic Expressions–Variables and Basic Expressions
objects and, The Python Conceptual Hierarchy
operator overloading and, Constructors and Expressions: __init__ and __sub__
quiz questions and answers, Test Your Knowledge: Quiz
slice, Intercepting Slices
statements and, The Python Conceptual Hierarchy, Expression Statements–Expression Statements and In-Place Changes
string formatting, String Formatting Expressions–Dictionary-Based Formatting Expressions
variables and, Variables, Objects, and References

extended sequence unpacking, Assignment Statement Forms, Extended Sequence Unpacking in Python 3.X–Application to for loops, Python 3.X extended sequence assignment in for loops

about, Assignment Statement Forms, Extended Sequence Unpacking in Python 3.X–Application to for loops
for loops and, Python 3.X extended sequence assignment in for loops

extending built-in types, Extending Built-in Types, Extending Types by Embedding, Extending Types by Subclassing–Extending Types by Subclassing

about, Extending Built-in Types
by embedding, Extending Types by Embedding
by subclassing, Extending Types by Subclassing–Extending Types by Subclassing

extension modules, Other Kinds of Modules