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Proper way to exit iPhone application?

I am programming an iPhone app, and I need to force it to exit due to certain user actions. After cleaning up memory the app allocated, what's the appropriate method to call to terminate the application? ...
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How to write to an existing excel file without overwriting data (using pandas)?

I use pandas to write to excel file in the following fashion: 11 Answers 11 ...
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Is it possible to change the package name of an Android app on Google Play?

I would like to know whether it is technically possible, not whether it is easy or not, to change the actual package name of an Android app that is on Google Play. What I mean by package name is the name that will show up in the URL. Please, can anyone tell me why this is / is not possible? Thanks! ...
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MySQL: multiple tables or one table with many columns?

... Any time information is one-to-one (each user has one name and password), then it's probably better to have it one table, since it reduces the number of joins the database will need to do to retrieve results. I think some databases have a limit on the n...
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What is a postback?

I'm making my way into web development and have seen the word postback thrown around. Coming from a non-web based background, what does a new web developer have to know about postbacks? (i.e. what are they and when do they arise?) ...
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How to wait for a BackgroundWorker to cancel?

...dea): private BackgroundWorker worker = new BackgroundWorker(); private AutoResetEvent _resetEvent = new AutoResetEvent(false); public Form1() { InitializeComponent(); worker.DoWork += worker_DoWork; } public void Cancel() { worker.CancelAsync(); _resetEvent.WaitOne(); // will bl...
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How to create cron job using PHP?

I'm new to using cron job. I don't even know how to write it. I have tried to search from internet, but I still don't understand it well. I want to create a cron job that will execute my code every minute. I'm using PHP to create it. It is not working. ...
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In Python, when should I use a function instead of a method?

The Zen of Python states that there should only be one way to do things- yet frequently I run into the problem of deciding when to use a function versus when to use a method. ...
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Best ways to teach a beginner to program? [closed]

... I've had to work with several beginner (never wrote a line of code) programmers, and I'll be doing an after school workshop with high school students this fall. This is the closest thing I've got to documentation. It's still a work in...
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Image width/height as an attribute or in CSS? [duplicate]

What's the "correct" semantic way to specify image height and width? In CSS... 12 Answers ...