ASP.NET Web PDF Document Viewer/Editor Control Library

At the end of the defense s presentation, everyone stood as the jurors left the courtroom, and then the court adjourned for the day If what lawyers believe is true, the presentation the jurors had just experienced would play a signi cant role in the verdict they would.

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Reading the value of global variables is not a problem in general, but one thing may make it problematic. If a local variable or parameter exists with the same name as the global variable you want to access, you can t do it directly. The global variable is shadowed by the local one. If needed, you can still gain access to the global variable by using the function globals, a close relative of vars, which returns a dictionary with the global variables. (locals returns a dictionary with the local variables.) For example, if you had a global variable called parameter in the previous example, you couldn t access it from within combine because you have a parameter with the same name. In a pinch, however, you could have referred to it as globals()['parameter']: >>> def combine(parameter): print parameter + globals()['parameter'] ... >>> parameter = 'berry' >>> combine('Shrub') Shrubberry

class Cat attr_accessor :name, :age, :gender, :color end class Dog attr_accessor :name, :age, :gender, :color end class Snake attr_accessor :name, :age, :gender, :color end

It s just like creating the Person class, but multiplied for the three different animals. You could continue on by creating animals with code such as lassie = Dog.new or sammy = Snake.new, and setting the attributes for the pets with code such as lassie.age = 12 or sammy.color = "Green". Type in the preceding code and give it a try if you like. However, creating the classes in this way would miss out on one of the best features of object-oriented programming: inheritance. Inheritance allows different classes to relate to one another and group concepts by their similarities. In this case, cats, dogs, and snakes are all pets. Inheritance allows you to create a parent Pet class, and then let your Cat, Dog, and Snake classes inherit the features that all pets have. Almost everything in real life exists in a similar structure to your classes. Cats can be pets, which are, in turn, animals; which are, in turn, living things; which are, in turn, objects that exist in the universe. A hierarchy of classes exists everywhere, and objectoriented languages let you define those relationships in code.

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[["Laura Smith", "Cook", "Female", "23"], ["Debbie Watts", "Professor", "Female", "38"]]

This operation provides you with the two matching people contained within an array that you can iterate through.

Rebinding global variables (making them refer to some new value) is another matter. If you assign a value to a variable inside a function, it automatically becomes local unless you tell Python otherwise. And how do you think you can tell it to make a variable global >>> x = 1 >>> def change_global(): global x x = x + 1 >>> change_global() >>> x 2 Piece of cake!

reach at the end of the trial. Whatever the jurors thought that day, the journalists in the room wasted no time in pronouncing their verdict about how they thought the two PowerPoint presentations had gone.

Once you can read and query data, the next step is being able to change it, delete it, and rewrite your CSV file with a new version of the data for future use. Luckily, this is as simple as reopening the file with write access and pushing the data back to the file. The CSV module handles all of the conversion.

require 'csv' people = CSV.read('text.txt') laura = people.find { |person| person[0] =~ /Laura/ } laura[0] = "Lauren Smith" CSV.open('text.txt', 'w') do |csv| people.each do |person| csv << person end end