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We need to consider what we really want from such a union. If we need a list of names for a joint Christmas party for the two clubs, then we don t want anyone listed twice. The way to avoid duplicates is to project just the names from each table. The algebra expression is shown in Listing 7-5 and the SQL in Listing 7-6.

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Listing 1-12. >>> def multiply_nums(x, y): ... return x * y ... >>> multiply_nums(25, 7) 175 As seen above, parameters are simply variables that are assigned when the function is called. Specifically, we assign 25 to x and 7 to y in the example. The function then takes x and y, performs a calculation and returns the result. Functions in Python are just like other variables and they be passed around as parameters to other functions if needed. Here we show a basic example of passing one function to another function. We ll pass the multiply_nums function into the function below and then use it to perform some calculations. Listing 1-13. >>> def perform_math(oper): ... return oper(5, 6) ... >>> perform_math(multiply_nums) 30 Although this example is very basic, you can see that another function can be passed as a parameter and then used within another function. For more detail on using def and functions, please take a look at 4, which is all about functions.

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vb.net code 39 reader

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qooxdoo (http://qooxdoo.sourceforge.net) is an open source Ajax user interface library. It includes widgets and layout managers. In addition, a number of other frameworks allow for integration with server-side languages.

Python is an object-oriented programming language. which means that everything in the language is an object of some type. Much like building blocks are used for constructing buildings, each object in Python can be put together to build pieces of programs or entire programs. This section will give you a brief introduction to Python classes, which are one of the keys to object orientation in this language. Classes are defined using the class keyword. Classes can contain functions, methods, and variables. Methods are just like functions in that the def keyword is used to create them, and they accept parameters. The only difference is that methods take a parameter known as self that refers to the object to which the method belongs. Classes contain what is known as an initializer method, and it is called automatically when a class is instantiated. Let s take a look at a simple example and then explain it.

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Listing 7-6. SQL to Project the Appropriate Columns Before the Union SELECT FamilyName, Name FROM ClubA UNION SELECT LastName, FirstName FROM ClubB

You ve seen that Ajax can provide a powerful approach to developing web applications, but it has also been criticized for a number of reasons. These criticisms relate to the following areas: Difficulties in recognizing changed data: When received, changes in content may not be immediately obvious to the user. This is in contrast to traditional web applications where the user can see the page refreshing and infer that the content has changed. Server or network impacts: During periods of heavy load, there may be longer-thannormal delays in server or network response. Variations in server load can also mean that client-side processing doesn t run in the expected order. Reduced usability: Ajax can break the Back button functionality and make it impossible to bookmark application states. The following solutions may go some way to addressing these criticisms.

Listing 1-14 Simple Python Class >>> class my_object: .. def __init__(self, x, y): .. selfx = x .. selfy = y .. .. def mult(self): .. print selfx * selfy .. .. def add(self): .. print selfx + selfy .. >>> obj1 = my_object(7, 8) >>> obj1mult() 56 >>> obj1add() 15 In this class example, we define a class named my_object The class accepts two parameters, x and y A class initializer method is named __init__(), and it is used to initialize any values that may be used in the class An initializer also defines what values can be passed to a class in order to create an object You can see that each method and function within the class accepts the self argument The self argument is used to refer to the object itself, this is how the class shares variables and such.

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