Servlet NewJavaServlet Test

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 CONTENTS  
 
vi 
Other Python Statements ................................................................................................................. 21


Documenting Code........................................................................................................................... 22


Python Help ..................................................................................................................................... 23


Summary ......................................................................................................................................... 24


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Chapter 2: Data Types and Referencing .......................................................................................25 
Python Data Types ........................................................................................................................... 25


Strings and String Methods.......................................................................................................... 27


String Formatting..................................................................................................................... 31


Lists, Dictionaries, Sets, and Tuples............................................................................................. 33


Lists ........................................................................................................................................ 33


List Comprehensions ............................................................................................................... 40


Tuples ..................................................................................................................................... 41


Dictionaries ............................................................................................................................. 42


Sets ......................................................................................................................................... 45


Ranges .................................................................................................................................... 48


Range Format .......................................................................................................................... 49


Jython-specific Collections .......................................................................................................... 50


Files............................................................................................................................................. 52


Iterators ....................................................................................................................................... 54


Referencing and Copies ............................................................................................................... 55


Garbage Collection....................................................................................................................... 57


Summary ......................................................................................................................................... 58


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Chapter 3: Operators, Expressions, and Program Flow ...............................................................59
 
Types of Expressions ....................................................................................................................... 59


Mathematical Operations ................................................................................................................. 59


Comparison Operators ................................................................................................................. 63


Bitwise Operators ........................................................................................................................ 65


Augmented Assignment ............................................................................................................... 66


Boolean Expressions .................................................................................................................... 68


Conversions ................................................................................................................................. 70


Using Expressions to Control Program Flow...................................................................................... 72


if-elif-else Statement ................................................................................................................... 72


while Loop ................................................................................................................................... 73


continue Statement...................................................................................................................... 74


break Statement .......................................................................................................................... 75


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 CONTENTS  
 
 
 
vii 
for Loop ....................................................................................................................................... 76


Example Code.............................................................................................................................. 77


Summary ......................................................................................................................................... 79


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Chapter 4: Defining Functions and Using Built-ins ......................................................................81
 
Function Syntax and Basics.............................................................................................................. 81


The def Keyword.......................................................................................................................... 82


Naming the Function.................................................................................................................... 82


Function Parameters and Calling Functions.................................................................................. 84


Recursive Function Calls .......................................................................................................... 86


Function Body.............................................................................................................................. 86


Documenting Functions ........................................................................................................... 86


Returning Values...................................................................................................................... 87


Introducing Variables ............................................................................................................... 88


Other Statements..................................................................................................................... 89


Empty Functions ...................................................................................................................... 89


Miscellaneous Information for the Curious Reader............................................................................ 90


Built-in Functions............................................................................................................................. 90


Alternative Ways to Define Functions ............................................................................................... 90


Lambda Functions ....................................................................................................................... 91


Generator Functions......................................................................................................................... 91


Defining Generators ..................................................................................................................... 92


Generator Expressions ................................................................................................................. 95


Namespaces, Nested Scopes, and Closures ..................................................................................... 95


Function Decorators......................................................................................................................... 96


Coroutines ....................................................................................................................................... 99


Decorators in Coroutines............................................................................................................ 101


Coroutine Example..................................................................................................................... 102


Summary ....................................................................................................................................... 102


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Chapter 5: Input and Output........................................................................................................105 
Input from the Keyboard................................................................................................................. 105


sys.stdin and raw_input............................................................................................................. 105


Obtaining Variables from Jython Environment ............................................................................ 106


File I/O ........................................................................................................................................... 107


Pickle............................................................................................................................................. 110


Output Techniques..................................................................................................................... 111


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