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Special Method __delattr__(self, name) __dir__(self) __getattr__(self, name) __getattribute__(self, name) __setattr__(self, name, value)

Usage dir(x)

Returns a list of x s attribute names v = xn Returns the value of object x s n attribute if it isn t found directly

Let s add a new requirement to the stock trade/approve example: The person who initiates the trade cannot be the same person who approves it To implement this, we need to do two things In the rst Receive activity (Figure 1110), an Operation Validation routine nds and stores the username who initiated the trade In the second Receive activity (Figure 1111) an Operation Validation routine compares the user requesting approval to the user who initiated the trade If they re the same, or if either is blank, the authorization will be denied Listing 1112 shows a small function for determining the user s name sent to the service This function would be more based on the robust working with more predictable claims, such as those in certi cates, but to illustrate how access to service operations is controlled programmatically, it will suf ce

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the name of the nonexistent attribute The class works because we are using the object s __dict__ which is what the base class __getattr__(), __setattr__(), and __delattr__() methods use, although here we have used only the base class s __getattr__() method All the special methods used for attribute access are listed in Table 82 There is another way of getting constants: We can use named tuples Here are a couple of examples:

Const = collectionsnamedtuple("_", "min max")(191, 591) Constmin, Constmax # returns: (191, 591) Offset = collectionsnamedtuple("_", "id name description")(*range(3)) Offsetid, Offsetname, Offsetdescription # returns: (0, 1, 2)

Listing 1113 shows how is used The two functions, and , are generated by the WF designer The rst one stores the username in a variable scoped to the , work ow class If it cannot nd the username, it sets the rejecting the call The second function compares the current username to , again the previous one If they are the same, it sets the , the Receive activrejecting the call In both cases, when ity does not call the operation contract

In both cases we have just used a throwaway name for the named tuple because we want just one named tuple instance each time, not a tuple subclass for creating instances of a named tuple Although Python does not support an enum data type, we can use named tuples as we have done here to get a similar effect

Due to the strict memory constraints and the requirement to support application interaction and data sharing within related applications, the Mobile Information Device Profile does not support the familiar Applet programming model introduced by the Java 2 Platform, Standard Edition (J2SE ) Rather, MIDP introduces a new application model that is better suited for the specific needs of small, resource-constrained devices This application model is integrated closely with the MIDP user interface libraries (see s 8 11), and it replaces the simple, command line-oriented application model supported by the Connected, Limited Device Configuration [ Team LiB ]

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For our last look at attribute access special methods we will return to an example we rst saw in 6 In that chapter we created an Image class whose width, height, and background color are xed when an Image is created (although they are changed if an image is loaded) We provided access to them using read-only properties For example, we had:

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This is easy to code but could become tedious if there are a lot of read-only properties Here is a different solution that handles all the Image class s read-only properties in a single method:

def __getattr__(self, name): if name == "colors": return set(self__colors) classname = self__class____name__ if name in frozenset({"background", "width", "height"}): return self__dict__["_{classname}__{name}"format( **locals())] raise AttributeError("'{classname}' object has no " "attribute '{name}'"format(**locals()))

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