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connection = connection schema = EmailForm(state=c) .. same as before You could now update the example like this: class ValidOption(formencodevalidatorsFancyValidator): def validate_python(self, value, c): valid_values = get_option_values(cconnection) if value not in valid_values: raise formencodeInvalid("Invalid value", value, c) In this way, the validator can use request-specific information even though it is defined before the request starts The previous implementation uses the validate_python() method, which simply raises an exception if it needs to do so This is useful in this example because the conversion needs to be done by the validator when converting to and from Python This won t be the case for all the validators you create, though The _to_python() and _from_python() methods are provided for you to implement any conversion code to convert to or from Python, respectively.

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As you learned during the discussion of global (device) coordinates and local (widget) coordinates, Qt can use different coordinate systems for different areas of the screen. The difference between the global and local coordinates is that the origin, the point (0,0), has been moved. In technical terms, this is known as translating the coordinate system.

RC4 is the most widely used stream cipher (at the time at which this book was written). It is approximately ten times faster than DES.

The validate_python() method is called after _to_python() so that the value argument will be a normal Python object by the time it comes to being validated validate_python() is called before _from_python() Both _to_python() and _from_python() take the same arguments as validate_ python()..

Note I refer to the device s coordinates as global because they are shared between all painters working

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You ll remember from earlier in the chapter that validators can be customized when you instantiate them in a schema. At the moment, the validator you ve created always displays the message Invalid value. Let s update the validator to allow it to be customized: class ValidOption(formencode.validators.FancyValidator): messages = { 'invalid': 'Invalid value', } def validate_python(self, value, c): valid_values = get_option_values(c.connection) if value not in valid_values: raise formencode.Invalid( self.message("invalid", c), value, c ) You can also include values in the message itself like this: class ValidOption(formencode.validators.FancyValidator): messages = { 'invalid': 'Invalid value %(invalid)s', } def validate_python(self, value, c): valid_values = get_option_values(c.connection) if value not in valid_values: raise formencode.Invalid( self.message("invalid", c, invalid=value), value, c ) The message string specified gets interpolated with a dictionary made from the keyword arguments you pass to the self.message() function. This system is designed to make the messages easy to format for different environments or replaceable for different languages. You ll also notice that you use a special exception class, formencode.Invalid, to raise an error. This is the same exception class you catch in the controller action and use to obtain the values to pass to htmlfill.render(). Besides the string error message, Invalid exceptions have a few other instance variables: value: This is the input to the validator that failed. state: This is the associated state. msg: This is the error message (str(exc) returns this). error_list: If the exception happened in a ForEach (list) validator, then this will contain a list of Invalid exceptions. Each item from the list will have an entry, either None for no error or an exception.

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on the device (and widgets, if the device happens to be a screen). Each painter is then transformed to a point relevant to its purpose. Other commonly used notations are physical device coordinates and logical local coordinates.

s Caution While we describe how RC4 works here, you should not try to implement it on your own. Use an

error_dict: If the exception happened in a Schema (dictionary) validator, then this will contain Invalid exceptions for each failing field. .unpack_errors(): This method returns a set of lists and dictionaries containing strings for each error. It s an unpacking of error_list, error_dict, and msg. If you get an Invalid exception from a Schema, you probably want to call this method on the exception object. If you are interested in writing your own validators, it is useful to see the source code for the FancyValidator class. It is in the formencode.api module and explains all the options and methods validators have. There are other types of validators too such as compound validators and chained validators. Generally speaking, the best way to implement your own validator is to look at the source code of an existing validator that behaves in a similar manner and implement your own validator in the same way.

The coordinate system of a painter can be translated as well (an example of such a translation is shown in Figure 7-18). In the figure, the gray box is what is drawn in relation to the original coordinate system. The coordinate system is transformed through the following call: painter.translate( 30, 30 ); The result is that the rectangle is drawn where the black rectangle is the coordinate system has been shifted to the right and downward.

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