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In Python, when to use a Dictionary, List or Set?
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A list keeps order, dict and set don't: when you care about order, therefore, you must use list (if your choice of containers is limited to these three, of course;-).
dict associates with each key a value, while list and set just contain values: ver...
Dual emission of constructor symbols
...? This class has no base. Why does it have a "complete object constructor" and a "base object constructor" for each?
This Q&A implies to me that this is simply a by-product of polymorphism support, even though it's not actually required in this case.
Note that c++filt used to include this info...
Project structure for Google App Engine
...n in Google App Engine right when it came out, to play with the technology and work on a pet project that I had been thinking about for a long time but never gotten around to starting. The result is BowlSK . However, as it has grown, and features have been added, it has gotten really difficult to...
Merge Images Side by Side(Horizontally)
...ide-by-side allowing you to adjust spacing between each image (-geometry), and the general layout (-tile).
montage [0-5].png -tile 5x1 -geometry +0+0 out.png
Other examples can be found on Montage Usage page
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How do you close/hide the Android soft keyboard using Java?
I have an EditText and a Button in my layout.
108 Answers
108
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How to check if variable's type matches Type stored in a variable
... omissions.
The is operator does not check if the runtime type of the operand is exactly the given type; rather, it checks to see if the runtime type is compatible with the given type:
class Animal {}
class Tiger : Animal {}
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object x = new Tiger();
bool b1 = x is Tiger; // true
bool b2 = x is ...
How to check if a file exists in Go?
Go's standard library does not have a function solely intended to check if a file exists or not (like Python's os.path.exists ). What is the idiomatic way to do it?
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Computed read-only property vs function in Swift
...operties for just that: properties; meaning simple values that you can get and/or set. I use functions (or methods) when actual work is being done. Maybe something has to be computed or read from disk or from a database: In this case I use a function, even when only a simple value is returned. That ...
How to read integer value from the standard input in Java
...can also tokenize input with regular expression, etc. The API has examples and there are many others in this site (e.g. How do I keep a scanner from throwing exceptions when the wrong type is entered?).
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In Python, how to display current time in readable format
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First the quick and dirty way, and second the precise way (recognizing daylight's savings or not).
import time
time.ctime() # 'Mon Oct 18 13:35:29 2010'
time.strftime('%l:%M%p %Z on %b %d, %Y') # ' 1:36PM EDT on Oct 18, 2010'
time.strftime(...