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Notice how the value save is associated directly with action rather than action.None. This is so that if the dictionary contained a key "None" and a key None, they could both be handled correctly. Returning to the example, notice how in the person def you just created the field names that make up each person follow this naming convention so that FormEncode can automatically convert the values submitted from the HTML form into the nested data structure the Study schema requires. To make this conversion happen automatically, you need to add a NestedVariables prevalidator to the Study schema so it looks like this: class Study(Schema): pre_validators = [NestedVariables()] title = String(not_empty=True) start_date = DateConverter() end_date = DateConverter() person = ForEach(Person()) Prevalidators are validators that are run on the values before the values are passed to each of the other validators for validation and conversion. Schemas also take a chained_validators attribute, which you ll see later is for performing validation on the whole form after the prevalidators and individual field validators have been run.

He wants to respond to Alice and say, I think you are the love of my life, but he s interested in other women as well Carol may also respond to Bob s personal ad, and Bob may not know which woman he loves more He might want to tell both of these women that he loves them, yet he may not want Alice to know that he tells Carol that she is the love of his life, and vice versa We could try to use symmetric key cryptography to enable confidential communication between Alice and Bob, and Carol and Bob If Bob publishes a symmetric key in an online directory, then anyone who has access to that directory has access to that key With the key, someone can decode any messages encrypted with that key regardless of who encrypted it.

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The form also includes buttons for adding new people and removing ones the user added by mistake. These fields aren t part of the schema and don t need to be included in the validated and converted output, so you can also add the attributes allow_extra_fields=True and filter_extra_ fields=True to the Study schema. At this stage, you can start adding content including the finished schemas to the study controller you created earlier. At the top of the file after log is set up, add the following: from from from from from from from formencode.schema import Schema formencode.validators import Invalid, FancyValidator formencode.validators import Int, DateConverter, String, OneOf formencode import variabledecode formencode import htmlfill formencode.foreach import ForEach formencode.api import NoDefault

Before you get carried away and start implementing completely new widgets, let s see how a button is modified to look different. (A button is a good starting point because it has been designed for this purpose.) All buttons inherit the QAbstractButton class, which defines the basic mechanics and properties of a button. This class is then inherited into QPushButton, QRadioButton, and QCheckBox, which implement three different views of a button.

class Person(Schema): title = String() firstname = String(not_empty=True) surname = String(not_empty=True) role = OneOf(['1', '2', '3']) class Study(Schema): allow_extra_fields = True filter_extra_fields = True pre_validators = [variabledecode.NestedVariables()] title = String(not_empty=True) start_date = DateConverter() end_date = DateConverter() person = ForEach(Person()) One of the requirements was that a study should have at least one person. The ForEach validator you are using to validate people takes the same not_empty argument that validators such as String take, so you might think that adding not_empty=True to the validator constructor would be all you had to do. Unfortunately, this isn t the case; the ForEach validator is set up to return the value [] if the field is missing, so FormEncode doesn t notice the problem. There are two ways to fix this depending on what you want to achieve: Use not_empty=True, but always specify a hidden field such as <input type="hidden" name="person" value="" /> so that a value is always submitted and FormEncode is forced to validate the field. When the value "" is received, the not_empty=True argument means the standard empty message Please enter a value gets displayed and the user is aware of the problem. When people are added, the hidden field still gets submitted, but variabledecode overwrites the value with the decoded people values, so everything works as it should. Use if_missing=NoDefault to tell FormEncode not to return an empty list, [], if no people are submitted (which is the default behavior). Instead, because there is no default, the Study schema will display its missing message Missing value. You can also customize the Missing value message using the second approach like this: ForEach( Person(), if_missing=NoDefault, messages={'missing':'Please add a person'} )

QAbstractScrollArea, QAbstractSlider, and QFrame. Notice that even though the two first classes are abstract, it is not a rule. QFrame can be used as the basis of a new widget, but is also useful on its own.

For instance, if Alice sends a personal message to Bob, Carol might be able to intercept that communication and decrypt it because the key is public If Bob wants to receive confidential.

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