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that had called next (or send in the case of a coroutine which will be discussed later in this chapter). The generator is then indefinitely suspended, just like any other iterator. Upon calling next again, the generator is resumed by restoring these local variables, then executing the next bytecode instruction following the yield point. This process continues until the generator is either garbage collected or it exits. Generators can also be resumed from any thread, although some care is necessary to ensure that underlying system state is shared (or compatible).

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Generator expressions are an alternative way to create the generator object. Please note that this is not the same as a generator function! It s the equivalent to what a generator function yields when called. Generator expressions basically create an unnamed generator. Listing 4-30. >>> x = (2 * x for x in [1,2,3,4]) >>> x <generator object at 0x1> >>> x() Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: 'generator' object is not callable Let s see this generator expression in action: >>> for v in x: ... print v ... 2 4 6 8 >>> Typically generator expressions tend to be more compact but less versatile than generator functions. They are useful for getting things done in a concise manner.

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try { xmlhttp = new ActiveXObject("Msxml2.XMLHTTP"); } catch(e) { try { xmlhttp = new ActiveXObject("Microsoft.XMLHTTP"); } catch(e) { xmlhttp = false; } } } if (xmlhttp){ xmlhttp.onreadystatechange=checkNames; xmlhttp.open("GET", "usernames.xml", true); xmlhttp.send(null); } } } The function first checks to see that the user has entered a username there s no point in proceeding unless there is a username to check. It then clears any existing messages in the invalidMessage <span> element. The doCheck() function creates the XMLHttpRequest by testing the browser support and branching to the appropriate code. If the object is created successfully, the code assigns the checkNames() function to the onreadystatechange handler. It then uses a GET request to retrieve the usernames.xml file, sending no parameters with the request. After the XML document loads, it calls the handler function checkNames(): function checkNames() { if (xmlhttp.readyState==4){ if (xmlhttp.status==200) { var enteredUserName = document.getElementById("txtUserName").value; var usernameList = xmlhttp.responseXML.getElementsByTagName("username"); for (var i=0; i < usernameList.length; i++) { if (enteredUserName == usernameList[i].firstChild.nodeValue) { document.getElementById("invalidMessage").innerHTML = "Sorry this username is already in use. Choose another." break; } } } } } As usual, the code checks for a readyState value of 4 to determine whether the XML document has finished loading. If so, it then checks the status of the document and looks for the entered username: var enteredUserName = document.getElementById("txtUserName").value;

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One mistake people sometimes make when trying to get information like that shown in Figure 6-5 is to not recognize that two copies of the Member table are required. This often happens when designing a query in Microsoft Access (2007). Access automatically joins tables in a query on the foreign keys. However, in a situation like this, where each table has a foreign key referencing the other, Access includes only one copy of each table and effectively creates the join shown in Listing 6-4 and Figure 6-7.

Note that you can introduce other namespaces into your function definition. It is possible to include import statements directly within the body of a function. This allows such imports to be valid only within the context of the function. For instance, in the following function definition the imports of A and B are only valid within the context of f(). Listing 4-31. def f(): from NS import A, B At first glance, including import statements within your function definitions may seem unnecessary. However, if you think of a function as an object then it makes much more sense. We can pass functions

The code then retrieves all of the <username> nodes from the XML document: var usernameList = xmlhttp.responseXML.getElementsByTagName("username"); Finally, the code loops through the collection of nodes and compares the value to what the user entered: for (var i=0; i < usernameList.length; i++) { if (enteredUserName == usernameList[i].firstChild.nodeValue) { document.getElementById("invalidMessage").innerHTML = "Sorry this username is already in use. Choose another." break; } } If the code finds a match, an error message is displayed and the code breaks out of the loop. Figure 9-5 shows the error message that appears if the code detects a duplicate username.

Lisitng 6-4. Just One Join Between the Tables (But with a Complex Condition) SELECT * FROM Member m INNER JOIN Team t ON (m.MemberID = t.Manager) AND (m.Team = t.TeamName)

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