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Can I install Python 3.x and 2.x on the same Windows computer?

I'm running Windows and the shell/OS automatically runs Python based on the registry settings when you run a program on the command line. Will this break if I install a 2.x and 3.x version of Python on the same machine? ...
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What does mysql error 1025 (HY000): Error on rename of './foo' (errorno: 150) mean?

... show you the name of the index, something like this: CONSTRAINT region_ibfk_1 FOREIGN KEY (country_id) REFERENCES country (id) ON DELETE NO ACTION ON UPDATE NO ACTION Now simply issue an: alter table region drop foreign key region_ibfk_1; And finally an: alter table region d...
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Can I define a class name on paragraph using Markdown?

...for <blockquote>) I found the following online: Function function _DoBlockQuotes_callback($matches) { ...cut... //add id and class details... $id = $class = ''; if(preg_match_all('/\{(?:([#.][-_:a-zA-Z0-9 ]+)+)\}/',$bq,$matches)) { foreach ($matches[1] as $match) {...
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How to have stored properties in Swift, the same way I had on Objective-C?

...class ObjectAssociation<T: AnyObject> { private let policy: objc_AssociationPolicy /// - Parameter policy: An association policy that will be used when linking objects. public init(policy: objc_AssociationPolicy = .OBJC_ASSOCIATION_RETAIN_NONATOMIC) { self.policy = polic...
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Is the order of iterating through std::map known (and guaranteed by the standard)?

...::map is a sorted associative container std::unordered_map is a hash-table based associative container introduced in C++11 So, in order to clarify the guarantees on ordering. In C++03: std::set, std::multiset, std::map and std::multimap are guaranteed to be ordered according to the keys (and th...
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How do you create an asynchronous method in C#?

...read calls the asynchronous write method. WriteAsync is implemented by the Base Class Library (BCL), and uses completion ports for its asynchronous I/O. So, the WriteAsync call is passed down to the OS as an asynchronous file write. The OS then communicates with the driver stack, passing along the d...
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What is this 'Lambda' everyone keeps speaking of?

...nsive operations to get a user. Ajax for example users[name] = user_from_ajax; } return users[name]; }; Later on, we may notice that we have a similar function: var photos = []; var getPhoto = function (name) { if (! photo[name]) { // expensive operations to get a use...
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How to force NSLocalizedString to use a specific language

...; @end Implementation #import <objc/runtime.h> static const char _bundle=0; @interface BundleEx : NSBundle @end @implementation BundleEx -(NSString*)localizedStringForKey:(NSString *)key value:(NSString *)value table:(NSString *)tableName { NSBundle* bundle=objc_getAssociatedObject(s...
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How do I use a custom deleter with a std::unique_ptr member?

I have a class with a unique_ptr member. 6 Answers 6 ...
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How to re import an updated package while in Python Interpreter? [duplicate]

...rst. So after doing import importlib, you can then do importlib.reload(some_module). – fraxture Jan 13 '16 at 9:59 4 ...