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Traceback (most recent call last): .. xmlrpclibFault: <Fault 1: "<type 'exceptionsValueError'>:math domain error"> The preceding snippet illustrates several key points about using XML-RPC First, note that XML-RPC is not imposing any restrictions upon the argument types we are supplying We can call addtogether() with either strings or numbers, and we can supply any number of arguments The protocol itself does not care; it has no pre-conceived notion of how many arguments a function should take or what its types should be Of course, if we were making calls to a language that did care or even to a Python function that did not support variable-length argument lists then the remote language could raise an exception But that would be the language complaining, not the XML-RPC protocol itself.

// // // //

Second, note that XML-RPC function calls, like those of Python and many other languages in its lineage, can take several arguments, but can only return a single result value That value might be a complex data structure, but it will be returned as a single result And the protocol does not care whether that result has a consistent shape or size; the list returned by quadratic() (yes, I was tired of all of the simple add() and subtract() math functions that tend to get used in XML-RPC examples!) varies in its number of elements returned without any complaint from the network logic Third, note that the rich variety of Python data types must be reduced to the smaller set that XMLRPC itself happens to support In particular, XML-RPC only supports a single sequence type: the list.

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You can further customize this mashup by adding the User Input block and connecting it to the Upcoming block to allow the user to search for events.

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So when we supply remote_repr() with a tuple of three items, it is actually a list of three items that gets received at the server instead This is a common feature of all RPC mechanisms when they are coupled with a particular language; types they do not directly support either have to be mapped to a different data structure (as our tuple was here turned into a list), or an exception has to be raised complaining that a particular argument type cannot be transmitted Fourth, complex data structures in XML-RPC can be recursive; you are not restricted to arguments that have only one level of complex data type inside Passing a dictionary with another dictionary as one of its values works just fine, as you can see.

Note Hexadecimal representation is often used when working with bits because there is a more direct correlation between the hex representation of a number and its bit pattern than with the decimal representation.

Finally, note that as promised earlier an exception in our function on the server made it successfully back across the network and was represented locally on the client by an xmlrpclibFault instance This instance provided the remote exception name and the error message associated with it Whatever the language used to implement the server routines, you can always expect XML-RPC exceptions to have this structure The traceback is not terribly informative; while it tells us which call in our code triggered the exception, the innermost levels of the stack are simply the code of the xmlrpclib itself Thus far we have covered the general features and restrictions of XML-RPC If you consult the documentation for either the client or the server module in the Standard Library, you can learn about a few more features.

To create a word with the appropriate bit flags, declare a variable of the enum type, and use the bitwise OR operator to set the required bits. For example, the following code sets three of the four options: Enum type Flag word Bit flags ORed together CardDeckSettings ops = CardDeckSettings.SingleDeck | CardDeckSettings.FancyNumbers | CardDeckSettings.Animation ; To determine whether a particular bit is set, use the bitwise AND operator with the flag word and the bit flag. For example, the following code checks to see whether the SingleDeck bit flag is set. The AND operation is performed, and the result is compared to the value of the SingleDeck bit flag. UseSingleDeck = (ops & CardDeckSettings.SingleDeck) == CardDeckSettings.SingleDeck; Flag word Bit flag

In the examples in this chapter, you were shown how to use an API key with Flickr and Upcoming blocks. The API keys were also stored by Popfly. You can access all of your API keys from different vendors by selecting Main Menu My Projects My Stuff Developer Keys; see Figure 4-19.

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