...r methods', which is a simple implementation of the Observer pattern. Basically, the handler methods (callables) are stored in an array and are each called when the event 'fires'. Publish-Subscribe The disadvantage of Observer event systems is that you can only register the handlers on the actual Ev...

...gIntent contentIntent = PendingIntent.getActivity(context, UNIQUE_INT_PER_CALL, notificationIntent, 0); intents are not created if you send the same params. They are reused. share | improve this a...

...pen('filename.txt') as fp: for line in fp: print line We are all spoiled by CPython's relatively deterministic reference-counting scheme for garbage collection. Other, hypothetical implementations of Python will not necessarily close the file "quickly enough" without the with block if...

I tend to declare as static all the methods in a class when that class doesn't require to keep track of internal states. For example, if I need to transform A into B and don't rely on some internal state C that may vary, I create a static transform. If there is an internal state C that I want to be ...

...authority certificates, and private keys. Its contents can be cryptographically protected (with passwords) to keep private keys private and preserve the integrity of root certificates. Windows uses .pvk for a private key file. I'm not sure what standard (if any) Windows follows for these. Hopefully...

...of a 1D array is still a 1D array! (If you're used to matlab, it fundamentally doesn't have a concept of a 1D array. Matlab's "1D" arrays are 2D.) If you want to turn your 1D vector into a 2D array and then transpose it, just slice it with np.newaxis (or None, they're the same, newaxis is just mor...

... All you need is parent part if you use pathlib. from pathlib import Path p = Path(r'C:\Program Files\Internet Explorer\iexplore.exe') print(p.parent) Will output: C:\Program Files\Internet Explorer Case you need al...

... On the other hand, our variables are package variables, and thus automatically: global variables definitely not private not necessarily new can be accessed outside the package (or lexical scope) with the qualified namespace, as $package_name::variable. Declaring a variable with our allows you...

... intercepts the request before it handles it to HttpClientHandler which finally writes to the wire. PostAsJsonAsync extension internally creates an ObjectContent and when ReadAsStringAsync() is called in the LoggingHandler, it causes the formatter inside ObjectContent to serialize the object and tha...

... that every reference type gets this extra state in its space that is typically undesired. A string variable could be any sequence of characters, or it could be this crazy extra null value that doesn't map into my problem domain. A Triangle object has three Points, which themselves have X and Y va...