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How do I check if a variable exists?

...ar exists. To check if an object has an attribute: if hasattr(obj, 'attr_name'): # obj.attr_name exists. share | improve this answer | follow | ...
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Why is “import *” bad?

...citly imported ones, and possibly point to very different things. Defining __all__ in bar is often wise -- this states what will implicitly be imported - but still it's hard to trace where objects come from, without reading and parsing the bar module and following its imports. A network of import * ...
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Find the index of a dict within a list, by matching the dict's value

... tom_index = next((index for (index, d) in enumerate(lst) if d["name"] == "Tom"), None) # 1 If you need to fetch repeatedly from name, you should index them by name (using a dictionary), this way get operations would be O(1) ti...
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What is an .axd file?

...hat render resources to the client WebResource.axd?d=SbXSD3uTnhYsK4gMD8fL84_mH.... .css and .js files are static – Magnus May 4 '11 at 7:23 ...
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Get Slightly Lighter and Darker Color from UIColor

... The function is missing a _ before the word amount. Should be private func hueColorWithBrightnessAmount(_ amount: CGFloat) -> PXColor { – Codemonk Apr 17 '18 at 21:16 ...
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How do I make a request using HTTP basic authentication with PHP curl?

... You want this: curl_setopt($ch, CURLOPT_USERPWD, $username . ":" . $password); Zend has a REST client and zend_http_client and I'm sure PEAR has some sort of wrapper. But its easy enough to do on your own. So the entire request might look ...
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How to log PostgreSQL queries?

... In your data/postgresql.conf file, change the log_statement setting to 'all'. Edit Looking at your new information, I'd say there may be a few other settings to verify: make sure you have turned on the log_destination variable make sure you turn on the logging_collect...
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Disable Browser Link - which toolbar

...ble visual studios browser link. I found this question: How can I disable __vwd/js/artery in VS.NET 2013? and many other resources saying I should untick "Enable Browser Link" in the toolbar, but that toolbar doesn't show up in my visual studio. I've enabled all the debug toolbars but still no br...
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How do I remove a key from a JavaScript object? [duplicate]

...isIsObject= { 'Cow' : 'Moo', 'Cat' : 'Meow', 'Dog' : 'Bark' }; _.omit(thisIsObject,'Cow'); //It will return a new object => {'Cat' : 'Meow', 'Dog' : 'Bark'} //result If you want to modify the current object, assign the returning object to the current object. thisIsObject = _.omit...
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get path for my .exe [duplicate]

... in visualstudio 2008 you could use this code : var _assembly = System.Reflection.Assembly .GetExecutingAssembly().GetName().CodeBase; var _path = System.IO.Path.GetDirectoryName(_assembly) ; ...