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What is the difference between an expression and a statement in Python?
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Expressions only contain identifiers, literals and operators, where operators include arithmetic and boolean operators, the function call operator () the subscription operator [] and similar, and can be reduced to some kind of "value", which can be any Python object. Examples:
3 ...
How are parameters sent in an HTTP POST request?
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The values are sent in the request body, in the format that the content type specifies.
Usually the content type is application/x-www-form-urlencoded, so the request body uses the same format as the query string:
parameter=value&also=another
When you use a file uplo...
Are delphi variables initialized with a value by default?
...ehaviour:
Object fields are always initialized to 0, 0.0, '', False, nil or whatever applies.
Global variables are always initialized to 0 etc as well;
Local reference-counted* variables are always initialized to nil or '';
Local non reference-counted* variables are uninitialized so you have to as...
Image comparison - fast algorithm
...are any new images against that to determine if the new image is an exact (or close) duplicate of the base.
9 Answers
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Why is address zero used for the null pointer?
In C (or C++ for that matter), pointers are special if they have the value zero: I am adviced to set pointers to zero after freeing their memory, because it means freeing the pointer again isn't dangerous; when I call malloc it returns a pointer with the value zero if it can't get me memory; I use ...
When to use PNG or JPG in iPhone development?
...CPU energy to display. However, large PNGs may take longer to read from storage than more compressed image formats, and thus be slower to display.
JPG's are smaller to store, but lossy (amount depends on compression level), and to display them requires a much more complicated decoding algorithm. ...
What is the equivalent of the C# 'var' keyword in Java?
One use of the var keyword in C# is implicit type declaration. What is the Java equivalent syntax for var ?
15 Answers
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What does WISC (stack) mean? [closed]
LAMP is a well-known acronym for the software/technology bundle/stack representing Linux , Apache , MySQL , PHP . There are a few passing references on the Web that use the acronym WISC to speak of the other (supposedly Microsoft-centric) software/technology bundle/stack in contrast to LAMP...
What is better, curl or wget? [closed]
Are they the same or not? Can certain things be done with one but not the other? What are those? Or is it, at the end of the day, a matter of familiarity?
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How do I detect whether sys.stdout is attached to terminal or not? [duplicate]
...ere a way to detect whether sys.stdout is attached to a console terminal or not? For example, I want to be able to detect if foo.py is run via:
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