Simple .NET/ASP.NET PDF document editor web control SDK

There are many situations where a dictionary is more appropriate than a list. The name dictionary should give you a clue: an ordinary book is made for reading from start to finish. If you like, you can quickly open it to any given page. This is a bit like a Python list. Dictionaries, however (both real ones and their Python equivalent) are constructed so that you can look up a specific word (key) easily, to find its definition (value). Some arbitrary uses of Python dictionaries are as follows: Representing the state of a gaming board, with each key being a tuple of coordinates Storing file modification times, with file names as keys A digital telephone/address book Let s say you have a list of people: >>> names = ['Alice', 'Beth', 'Cecil', 'Dee-Dee', 'Earl'] What if you wanted to create a little database where you could store the telephone numbers of these people how would you do that One way would be to make another list. Let s say you re only storing their four-digit extensions. Then you would get something like this: >>> numbers = ['2341', '9102', '3158', '0142', '5551']

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The previous example is easily extended:

eval("x = 10") eval("x = 50", remote_binding) eval("puts x") eval("puts x", remote_binding)

One of the biggest distractions you can create during a presentation is to return to the keyboard every time you need to advance a slide. This creates a visual distraction, disrupts the natural ow of your delivery, and leaves the impression that the computer is controlling you rather than you controlling the computer. Like Mark did in the Angleton courtroom, free yourself from the computer by using a small remote control device to advance the slides in the presentation. Many of these devices are designed speci cally for PowerPoint presentations and are attached to a computer using a USB connection with no installation software needed. Some models feature a simple interface with only advance and reverse buttons, and some even include a laser pointer along with a button that allows you to black out the screen during the presentation.

10 50

In this example, two bindings are in play: the default binding, and the remote_binding (from the binding_elsewhere method). Therefore, even though you set x first to 10, and then to 50, you re not dealing with the same x in each case. One x is a local variable in the current context, and the other x is a variable in the context of binding_elsewhere.

Note You might wonder why I have used strings to represent the telephone numbers why not integers Consider what would happen to Dee-Dee s number then:

1

Although eval executes code within the current context (or the context supplied with a binding), class_eval, module_eval, and instance_eval can evaluate code within the context of classes, modules, and object instances, respectively. class_eval is ideal for adding methods to a class dynamically:

def add_accessor_to_person(accessor_name) Person.class_eval %Q{ attr_accessor :#{accessor_name} } end person = Person.new add_accessor_to_person :name add_accessor_to_person :gender person.name = "Peter Cooper" person.gender = "male" puts "#{person.name} is #{person.gender}"

The projected colors, images, and words were so thoroughly integrated into the presentation experience that turning off the projector would have been like eliminating the set of a theater production or the screen in a movie theater. This innovative media stage transformed the courtroom into something new an absorbing media experience that would engage the jurors through the next 2 hours of the presentation. Never breaking eye contact with the jurors or looking back at the screen, Mark now began to tell a gripping story that would lay out the evidence of the plaintiff s case.