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Java: Static Class?
... but it provides insurance in case the constructor is accidentally invoked from within the class. It guarantees that the class will never be instantiated under any circumstances. This idiom is mildly counterintuitive, as the constructor is provided expressly so that it cannot be invoked. It is there...
On logout, clear Activity history stack, preventing “back” button from opening logged-in-only Activi
...n my application require a user to be logged-in to view. Users can log out from almost any activity. This is a requirement of the application. At any point if the user logs-out, I want to send the user to the Login Activity . At this point I want this activity to be at the bottom of the history sta...
How to delete items from a dictionary while iterating over it?
Is it legitimate to delete items from a dictionary in Python while iterating over it?
10 Answers
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How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
... dictionaries x and y, z becomes a shallowly merged dictionary with values from y replacing those from x.
In Python 3.5 or greater:
z = {**x, **y}
In Python 2, (or 3.4 or lower) write a function:
def merge_two_dicts(x, y):
z = x.copy() # start with x's keys and values
z.update(y) # m...
Why is there no multiple inheritance in Java, but implementing multiple interfaces is allowed?
...Containing more than one subobject of same base class, ambiguity (override from which base class use), complicated rules of resolving such ambiguity.
– Tadeusz Kopec
May 22 '13 at 7:54
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Deleting all pending tasks in celery / rabbitmq
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From the docs:
$ celery -A proj purge
or
from proj.celery import app
app.control.purge()
(EDIT: Updated with current method.)
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How to handle static content in Spring MVC?
...beans.factory.xml.XmlBeanDefinitionStoreException: Line 31 in XML document from class path resource [META-INF/spring/application-context.xml] is invalid; nested exception is org.xml.sax.SAXParseException; lineNumber: 31; columnNumber: 35; cvc-complex-type.2.4.c: The matching wildcard is strict, but ...
What is the standard Python docstring format? [closed]
...umented, or to convert existing docstrings (can be mixing several formats) from a format to an other one.
Note: The examples are taken from the Pyment documentation
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Difference between thread's context class loader and normal classloader
...s the current classloader for the current thread. An object can be created from a class in ClassLoaderC and then passed to a thread owned by ClassLoaderD. In this case the object needs to use Thread.currentThread().getContextClassLoader() directly if it wants to load resources that are not availabl...
Do browsers parse javascript on every page load?
...derstands. This compiled code is then discarded once a user navigates away from the page as compiled code is highly dependent on the state and context of the machine at compilation time.
Chrome 42 introduces an advanced technique of storing a local copy of the compiled code, so that when the u...