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How do I get the object if it exists, or None if it does not exist?

When I ask the model manager to get an object, it raises DoesNotExist when there is no matching object. 18 Answers ...
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partial string formatting

Is it possible to do partial string formatting with the advanced string formatting methods, similar to the string template safe_substitute() function? ...
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back button callback in navigationController in iOS

I have pushed a view onto the navigation controller and when I press the back button it goes to the previous view automatically. I want to do a few things when back button is pressed before popping the view off the stack. Which is the back button callback function? ...
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How to make gradient background in android

I want to create gradient background where the gradient is in the top half and there's a solid color in the bottom half, like in this image below: ...
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How do I append text to a file?

What is the easiest way to append text to a file in Linux? 4 Answers 4 ...
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UITableView set to static cells. Is it possible to hide some of the cells programmatically?

UITableView set to static cells. 22 Answers 22 ...
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How to get the CPU Usage in C#?

I want to get the overall total CPU usage for an application in C#. I've found many ways to dig into the properties of processes, but I only want the CPU usage of the processes, and the total CPU like you get in the TaskManager. ...
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jQuery autocomplete tagging plug-in like StackOverflow's input tags? [closed]

What solutions accomplish the same auto-completion that SO uses for entering tags? 6 Answers ...
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Python: most idiomatic way to convert None to empty string?

What is the most idiomatic way to do the following? 16 Answers 16 ...
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Can I scroll a ScrollView programmatically in Android?

Is there any way to scroll a ScrollView programmatically to a certain position? 18 Answers ...