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Code Golf - π day

... Yeah, the ( operator alone allowed to shed 6 strokes! – Dan Andreatta Mar 18 '10 at 10:25 add a comment  |  ...
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Rename a dictionary key

... this question seems to be asking, is impractical because dict keys are usually immutable objects such as numbers, strings or tuples. Instead of trying to modify the key, reassigning the value to a new key and removing the old key is how you can achieve the "rename" in python. ...
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How to create NS_OPTIONS-style bitmask enumerations in Swift?

...tains(.secondOption) { print("multipleOptions has SecondOption") } let allOptions = MyOptions(rawValue: 7) if allOptions.contains(.thirdOption) { print("allOptions has ThirdOption") } Swift 2.0 In Swift 2.0, protocol extensions take care of most of the boilerplate for these, which are now...
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How do I get the row count of a pandas DataFrame?

...[0].count()", "len(data.index)"], xlabel="data rows" ) EDIT: As @Dan Allen noted in the comments len(df.index) and df[0].count() are not interchangeable as count excludes NaNs, share | improve...
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How do I have an enum bound combobox with custom string formatting for enum values?

... TypeConverter. I think this is what I was looking for. All hail Simon Svensson! [TypeConverter(typeof(EnumToStringUsingDescription))] Enum HowNice { [Description("Really Nice")] ReallyNice, [Description("Kinda Nice")] SortOfNice, [Description("Not Nice At All")] NotN...
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“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed

... In my case sudo apt-get install libx11-xcb1 fixed the problem. But your recommendation of using ldd was what pointed me to the correct library to install. Thanks! – Daniel Mar 17 '15 at 0:37 ...
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How do you Encrypt and Decrypt a PHP String?

... You may also use GCM (which removes the need for a separate MAC). Additionally, ChaCha20 and Salsa20 (provided by libsodium) are stream ciphers and do not need special modes. Unless you chose GCM above, you should authenticate the ciphertext with HMAC-SHA-256 (or, for the stream ciphers, Poly1305 -...
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What is the relative performance difference of if/else versus switch statement in Java?

...ic interface Action { void execute(String input); } And get hold of all implementations in some Map. You can do this either statically or dynamically: Map<String, Action> actions = new HashMap<String, Action>(); Finally replace the if/else or switch by something like this (leav...
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Convert a list of data frames into one data frame

I have code that at one place ends up with a list of data frames which I really want to convert to a single big data frame. ...
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How to check if click event is already bound - JQuery

...a(this[0], 'events')[type]; jQuery events are stored in a data object called events, so you could search in this: var button = $('#myButton'); if (-1 !== $.inArray(onButtonClicked, button.data('events').click)) { button.click(onButtonClicked); } It would be best, of course, if you could s...