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vb.net code 39 reader

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vb.net code 39 reader

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It is also quite common to see cases in which a function calls itself from inside the function body. This type of function call is known as a recursive function call. Let s take a look at a function that computes the factorial of a given argument. This function calls itself passing in the provided argument decremented by 1 until the argument reaches the value of 0 or 1. Listing 4-13. def fact(n): if n in (0, 1): return 1 else: return n * fact(n - 1) It is important to note that Jython is like CPython in that it is ultimately stack based. Stacks are regions of memory where data is added and removed in a last-in first-out manner. If a recursive function calls itself too many times then it is possible to exhaust the stack, which results in an OutOfMemoryError. Therefore, be cautious when developing software using deep recursion.

vb.net code 39 reader

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For security reasons, you can t use Ajax to request content from a domain outside of the current one. This is referred to as the Ajax sandbox. If you re running the web page on http://www.apress.com, you can only request from that domain. As you re working within a sandbox, you can make server-side requests without a domain name. For example, I could request XML from a server-side file using this code: xmlhttp.open("GET", "/bin/getXML.aspx", true); You could also include a parameter in this method call: xmlhttp.open("GET", "/bin/getXML.aspx contactName=" + escape(cName), true);

Figure 2-4. Truth tables for logical operators (T = True, F = False)

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vb.net code 39 reader

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This section will break down the different components that comprise the body of a function. The body of a function is the part that performs the work. Throughout the next couple of sub-sections, you will see that a function body can be comprised of many different parts.

First, you should specify a document string for the function. The docstring, if it exists, is a string that occurs as the first value of the function body. Listing 4-14. def times2(n): """Given n, returns n * 2""" return n * 2 As mentioned in 1, by convention we use triple-quoted strings, even if your docstring is not multiline. If it is multiline, this is how we recommend you format it. For more information, please take a look at PEP 257 (www.python.org/dev/peps/pep-0257).

vb.net code 39 reader

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The send() method can pass information with a request. You ll probably use it to POST information that filters the returned content. You send data in variable pairs: xmlhttp.send('var1=val1&var2=val2&var3=val3'); Make sure you use escape to encode the values that you send. You can also use the value null to indicate that you re not sending variables. If you re posting data, you need to change the MIME type of the request: xmlhttp.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded'); You can use an onreadystatechange event handler as I did in the previous chapter to check the value of the readyState property. The event handler can determine one of the following five values: 0: The request is not yet initialized. This occurs before calling the open() method. 1: The request is initialized but not sent. This occurs before calling the send() method. 2: The request has been sent and is being processed. 3: The request is being processed but hasn t been finished. 4: The response is completed. You can access the information with the responseText or responseXML property. The ready states don t work exactly the same way on each type of web browser. If you track the value of the readyState property, you might see different results in Safari compared with IE. Each time the readyState property changes, the application calls the event handler function. The code responds when the readyState equals 4, indicating that the response is complete:

Sometimes it can be a bit tricky turning natural-language descriptions into Boolean expressions. If you were asked for a list that included all the woman and all the juniors (don t ask why!), you might translate this literally and write the condition MemberType = 'Junior' AND Gender = 'F'. However, the AND means both conditions must be true, so this would give us junior women. What our natural-language statement really means is I want the row for any member if they are either a woman OR they are a junior (or both). Be careful.

vb.net code 39 reader

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vb.net code 39 reader

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vb.net code 39 reader

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