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Listing 4-33. def plus_five(func): x = func() return x + 5 @plus_five def add_nums(): return 1 + 2 In this example, the add_nums() function is decorated with the plus_five() function. This has the same effect as passing the add_nums function into the plus_five function. In other words, this decorator is syntactic sugar that makes this technique easier to use. The decorator above has the same functionality as the following code. Listing 4-34. add_nums = plus_five(add_nums) In actuality, add_nums is now no longer a function, but rather an integer. After decorating with plus_five you can no longer call add_nums(), we can only reference it as if it were an integer. As you can see, add_nums is being passed to plus_five at import time. Normally, we d want to have add_nums finish up as a function so that it is still callable. In order to make this example more useful, we ll want to make add_nums callable again and we will also want the ability to change the numbers that are added. To do so, we need to rewrite the decorator function a bit so that it includes an inner function that accepts arguments from the decorated function. Listing 4-35. def plus_five(func): def inner(*args, **kwargs): x = func(*args, **kwargs) + 5 return x return inner @plus_five def add_nums(num1, num2): return num1 + num2 Now we can call the add_nums() function once again and we can also pass two arguments to it. Because it is decorated with the plus_five function it will be passed to it and then the two arguments will be added together and the number five will be added to that sum. The result will then be returned. Listing 4-36. >>> add_nums(2,3) 10 >>> add_nums(2,6) 13 vb.net code 39 reader VB . NET Image: Example to Read Code 39 Barcode with VB . NET Codes in ...
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Free to download .NET, C#, VB . NET barcode reader app for Code 39 ; C# Code 39 recognition SDK; VB . NET Code 39 recognition SDK. To understand what is happening with the join in Listing 6-4 and Figure 6-7, consider first the Cartesian product of Member and Team. The Cartesian product gives us every combination of rows from each table. The join condition says only rows where the MemberID is the same as the Manager and Team and TeamName are the same. In everyday language, this amounts to Show me the members who manage the team they are in. For our data, that is just the single row for Brenda Nolan we see in Figure 6-7. This can be disconcerting for beginners, who quite rightly wonder what happened to all the other team members. In Access, you must manually remove one of the join conditions and add another copy of the Member table, as in Figure 6-5. print ean 13 barcode word, birt pdf 417, birt data matrix, word aflame upc lubbock, microsoft word qr code font, free code 39 font for word vb.net code 39 reader read code 39 barcode with vb . net - Stack Overflow
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NET Code 39 barcode Reader Control is an advanced developer-library for . NET class ... NET Code 39 barcode scanner can read barcode images using VB . making it impractical for use with this approach. An alternative would be to post the username to a serverside file to check for a match. Now that we ve covered the basics of function decorators it is time to take a look at a more in-depth example of the concept In the following decorator function example, we are taking a twist on the old tip_calculator function and adding a sales tax calculation As you see, the original calc_bill function takes a sequence of amounts, namely the amounts for each item on the bill The calc_bill function then simply sums the amounts and returns the value In the given example, we apply the sales_tax decorator to the function which then transforms the function so that it not only calculates and returns the sum of all amounts on the bill, but it also applies a standard sales tax to the bill and returns the tax amount and total amounts as well Listing 4-37. vb.net code 39 reader C# . NET Code 39 Barcode Reader Control | Free C# Code to Scan ...
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NET Code 39 Barcode Reader , Reading Code - 39 barcode images in .NET, C#, VB . NET , ASP.NET applications. def sales_tax(func): ''' Applies a sales tax to a given bill calculator ''' def calc_tax(*args, **kwargs): f = func(*args, **kwargs) tax = f * 18 print "Total before tax: $ %2f" % (f) print "Tax Amount: $ %2f" % (tax) print "Total bill: $ %2f" % (f + tax) return calc_tax @sales_tax def calc_bill(amounts): ''' Takes a sequence of amounts and returns sum ''' return sum(amounts) The decorator function contains an inner function that accepts two arguments, a sequence of arguments and a dictionary of keyword args We must pass these arguments to our original function when calling from the decorator to ensure that the arguments that we passed to the original function are applied within the decorator function as well. You can use different ways to construct the query to retrieve all the information about a team (members names, team name, and manager s name) for a report like the one in Figure 6-6. I find the idea of two joins quite intuitive, but other people prefer to take a calculus approach. I have reproduced the two tables in Figure 6-8. Now let s see how we can pick a member and find out what team he is in and who the manager is for that team. Let s move on to a more complicated example that includes an XSLT transformation. I ll revisit the contacts address book from 8. vb.net code 39 reader Visual Studio . NET Barcode Scanner Library API for . NET Barcode ...
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