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iOS 5 Best Practice (Release/retain?)

As a beginning iPhone programmer, what is the best practice for writing apps to be used either with iOS 5 or older versions? Specifically, should I continue using the release/retain of data, or should I ignore that? Does it matter? ...
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How do I deep copy a DateTime object?

Now $date1 and $date2 contain the same date -- three years from now. I'd like to create two separate datetimes, one which is parsed from a string and one with three years added to it. Currently I've hacked it up like this: ...
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Finding all possible permutations of a given string in python

I have a string. I want to generate all permutations from that string, by changing the order of characters in it. For example, say: ...
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Regular expression for first and last name

For website validation purposes, I need first name and last name validation. 23 Answers ...
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What is the Python equivalent of Matlab's tic and toc functions?

What is the Python equivalent of Matlab's tic and toc functions ? 12 Answers 12 ...
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What reason is there to use null instead of undefined in JavaScript?

I've been writing JavaScript for quite a long time now, and I have never had a reason to use null . It seems that undefined is always preferable and serves the same purpose programmatically. What are some practical reasons to use null instead of undefined ? ...
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How to extract the decision rules from scikit-learn decision-tree?

Can I extract the underlying decision-rules (or 'decision paths') from a trained tree in a decision tree as a textual list? ...
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Getting error while sending email through Gmail SMTP - “Please log in via your web browser and then

I'm having problems with gmail smtp server. I already read many posts here in StackOverflow about that subject. 9 Answers ...
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Re-sign IPA (iPhone)

I currently build all my applications with hudson using xcodebuild followed by a xcrun without any problems 11 Answers ...
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How can I deserialize JSON to a simple Dictionary in ASP.NET?

I have a simple key/value list in JSON being sent back to ASP.NET via POST. Example: 21 Answers ...