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Sum a list of numbers in Python
... you want to see decimals in the result, even though your input values are integers. By default, Python does integer division: it discards the remainder. To divide things through all the way, we need to use floating-point numbers. Fortunately, dividing an int by a float will produce a float, so we j...
Multiple levels of 'collection.defaultdict' in Python
...:
from collections import defaultdict
d = defaultdict(lambda: defaultdict(int))
This will create a new defaultdict(int) whenever a new key is accessed in d.
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Clearing intent
My Android app is getting called by an intent that is passing information (pendingintent in statusbar).
20 Answers
...
string sanitizer for filename
...name
Put the string in lower case
Remove foreign accents such as Éàû by convert it into html entities and then remove the code and keep the letter.
Replace Spaces with dashes
Encode special chars that could pass the previous steps and enter in conflict filename on server. ex. "中文百强网"
Re...
How to set environment variables in Python?
...le DEBUSSY to the string 1.
To access this variable later, simply use:
print(os.environ["DEBUSSY"])
Child processes automatically inherit the environment variables of the parent process -- no special action on your part is required.
...
Android Fragments. Retaining an AsyncTask during screen rotation or configuration change
...e through Fragment.getActivity().isChangingConfigurations(). So, at the point where you would decide to stop your AsyncTask (in onStop() or onDestroy() most likely), you could for example check if the configuration is changing and if so stick it in a static SparseArray under the fragment's identifi...
std::unique_lock or std::lock_guard?
... you should use it. Not only it avoids unnecessary overhead but also shows intent to the reader that you will never unlock this guard.
– Stephan Dollberg
Dec 11 '13 at 11:07
...
Abstract class in Java
...act methods which the inheriting subclass must implement.
Provide a common interface which allows the subclass to be interchanged with all other subclasses.
Here's an example:
abstract public class AbstractClass
{
abstract public void abstractMethod();
public void implementedMethod() { Sy...
How to create a template function within a class? (C++)
...ct A { template<typename> void f(); }; template<> void A::f<int>() { } for example. You just can't specialize them in class scope, but you can do so well when done in namespace scope. (not to be confused with the scope that the specialization is actually put into: the specializatio...
SCOPE_IDENTITY() for GUIDs?
... ColGuid uniqueidentifier NOT NULL DEFAULT NewSequentialID(),
Col2 int NOT NULL
)
GO
DECLARE @op TABLE (
ColGuid uniqueidentifier
)
INSERT INTO dbo.GuidPk (
Col2
)
OUTPUT inserted.ColGuid
INTO @op
VALUES (1)
SELECT * FROM @op
SELECT * FROM dbo.GuidPk
Reference: Exp...