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Modify the code to use lazy translations. Notice that the text variable is assigned its message with the lazy_ugettext() function: from pylons.i18n import get_lang, lazy_ugettext, set_lang set_lang('en') text = lazy_ugettext(u'Hello!') class HelloController(BaseController): def lazy(self): resp = '' for lang in ['fr','en','es']: set_lang(lang) resp += u'%s: %s<br />' % (get_lang(), _(u'Hello!')) resp += u'Text: %s<br />' % text return resp This time you get the output expected: ['fr']: Bonjour! ['en']: Hello! ['es']: Hola! Text: Hola! There is one drawback to be aware of when using the lazy translation functions: they are not actually strings. This means that if our example had used the following code, it would have failed with the error cannot concatenate 'str' and 'LazyString' objects: u'Text: ' + text + u'<br />' For this reason, you should use the lazy translations only where absolutely necessary. Always ensure they are converted to strings by calling str() or repr() before they are used in operations with real strings.

Listing 7-12. Implementation of a minimal dialog Dialog::Dialog() : QDialog() { ui.setupUi( this ); connect( ui.clickButton, SIGNAL(clicked()), this, SLOT(buttonClicked()) ); }

One thing to keep in mind when you are internationalizing an application is that other languages don t necessarily have the same plural forms as English. Although English has only two forms, singular and plural, Slovenian, for example, has singular, dual, and plural, which means that in Slovenian one thing, two things, and three things would all be treated differently! That means that the following will not work: # BAD! if n == 1: msg = _("There is one person here") else: msg = _("There are %(num)d people here") % {'num': n} Pylons provides the ungettext() function internationalizing plural words. It can be used as follows: translated_string = ungettext( u'There is %(num)d person here', u'There are %(num)d people here', 4 )

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void Dialog::buttonClicked() { QMessageBox::information( this, tr("Wohoo!"), tr("You clicked the button!") ); } The dialog, combined with a minimal main function, produces the dialog shown in Figure 7-26. In the figure, the top button is disabled, the middle button is being pressed, while the bottom one is an inactive toggle button.

Symmetric key encryption using algorithms like DES, Triple DES, and AES are relatively efficient compared to asymmetric key cryptography because they do not require as many CPU cycles. This is due to their use of relatively simple, discrete logic operations, as compared to modular exponentiation in RSA. As a result, RSA ends up being about one thousand times slower than DES (Daswani and Boneh 1999). There are other trade-offs between the two algorithms as well. In a symmetric encryption algorithm, there is a concern that if Alice and Bob want to communicate, they would need to agree on a key beforehand. The key agreement problem may not be as significant in the asymmetric case because public keys can be published to everybody. However, there is still a problem with publishing public keys that we haven t addressed. Specifically, anyone can generate a public/private key pair, but the user s public key needs to be tied to the user s identity. Earlier in this chapter, we discussed an example in which Bob published his public key to a public directory. To keep things simple in our explanation as we introduced asymmetric cryptography, we left out one important detail. When Alice does a lookup in the public directory for Bob s public key, how does she know that someone is not impersonating Bob In particular, you can think of the public directory as a two-column table in which the first column is the name of a person, and the second column is that person s public key. If the public directory allows anyone to publish a public key without first verifying that person s identity, an attacker could masquerade as Bob by publishing a public key under Bob s name!

elif action=='Save': # Assume we are trying to save the form schema = Study() try: result = schemato_python(dict(requestparams), c) except Invalid, e: return render_form( values=values, errors=variabledecodevariable_encode( eunpack_errors() or {}, add_repetitions=False ), number_of_people=number_of_people(values) ) else: # You would save the data here before redirecting # values will be a Python nested data structure # which shouldn't need any further conversion # In this case we just display the result return str(result) else: raise Exception('Invalid action %s'%action) Since this is a new project, you ll need to add some helpers to the lib/helperspy file before this example will work Add these lines: from webhelpershtmltags import * from routes import url_for To test this example, start the development server with the paster serve --reload developmentini command, and visit http://localhost:5000/study/index.

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