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Does a valid XML file require an XML declaration?
...t says it "should" be used -- which means it is recommended, but not mandatory. In XML 1.1, however, the declaration is mandatory. See section 2.8 of the XML 1.1 Recommendation, where it says "MUST" be used. It even goes on to state that if the declaration is absent, that automatically implies the d...
Where is Python's sys.path initialized from?
...PYTHONPATH, plus an installation-dependent default"
-- http://docs.python.org/library/sys.html#sys.path
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Do I need dependency injection in NodeJS, or how to deal with …?
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In short, you don't need a dependency injection container or service locater like you would in C#/Java. Since Node.js, leverages the module pattern, it's not necessary to perform constructor or property injection. Although you sti...
Can I use a :before or :after pseudo-element on an input field?
... use the :after CSS pseudo-element on an input field, but it does not work. If I use it with a span , it works OK.
19...
Twitter Bootstrap - how to center elements horizontally or vertically
is there any way to center html elements vertically or horizontally inside the main parents?
12 Answers
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Styling multi-line conditions in 'if' statements? [closed]
... cond3 == 'val3' and cond4 == 'val4'):
do_something
Also, don't forget the whitespace is more flexible than you might think:
if (
cond1 == 'val1' and cond2 == 'val2' and
cond3 == 'val3' and cond4 == 'val4'
):
do_something
if (cond1 == 'val1' and cond2 == 'val2'...
Difference between volatile and synchronized in Java
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It's important to understand that there are two aspects to thread safety.
execution control, and
memory visibility
The first has to do with controlling when code executes (including the order in which instructions are executed)...
Sending websocket ping/pong frame from browser
...methods on a javascript WebSocket object in chrome related to ping-pong). Or is it just a design pattern (e.g. I literally send "ping" or any other string to the server and have it respond). Is ping-pong at all related to continuation frames?
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multiprocessing.Pool: When to use apply, apply_async or map?
I have not seen clear examples with use-cases for Pool.apply , Pool.apply_async and Pool.map . I am mainly using Pool.map ; what are the advantages of others?
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How to export revision history from mercurial or git to cvs?
I'm going to be working with other people on code from a project that uses cvs. We want to use a distributed vcs to make our work and when we finish or maybe every once in a while we want to commit our code and all of our revision history to cvs. We don't have write access to the project's cvs repo ...