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E731 do not assign a lambda expression, use a def
...aceback is still going to include the errant line number and source file. One might say "f" whereas the other says "lambda". Maybe the lambda error is easier to scan because it's not a single-character function name, or a poorly-named long name?
– g33kz0r
Feb...
Interface vs Base class
... for inheritance.
Consequently, because you can usually only inherit from one abstract class (in most statically typed OO languages that is... exceptions include C++) but be able to implement multiple interfaces, it allows you to construct objects in a strictly as required basis.
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Foreign Key naming scheme
... involved in the key, so it makes it easy to see which tables a particular one (the first one named) depends on (the second one named). In this scenario the complete set of keys would be:
FK_task_user
FK_note_task
FK_note_user
So you can see that tasks depend on users, and notes depend on both ta...
Closing JDBC Connections in Pool
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When using Connection Pool, should one close the Connection at the end? If so, isn't the purpose of pooling lost? And if not, how does the DataSource know when a particular instance of Connection is freed up and can be reused? I am a little confused on this on...
Is JavaScript guaranteed to be single-threaded?
...g the question of whether browsers really implement their JS engines using one OS-thread, or whether other limited threads-of-execution are introduced by WebWorkers.)
However, in reality this isn't quite true, in sneaky nasty ways.
The most common case is immediate events. Browsers will fire these...
How to color System.out.println output? [duplicate]
...2-qa-1220-console.html
Edit: of course there are newer articles than that one I posted, the information is still viable though.
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How is Python's List Implemented?
...the same time regardless of index:
...>python -m timeit --setup="x = [None]*1000" "x[500]"
10000000 loops, best of 3: 0.0579 usec per loop
...>python -m timeit --setup="x = [None]*1000" "x[0]"
10000000 loops, best of 3: 0.0566 usec per loop
I would be astounded if IronPython or Jython used...
Should the hash code of null always be zero, in .NET
...System.Collections.Generic.HashSet<> accept null as a set member, one can ask what the hash code of null should be. It looks like the framework uses 0 :
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How to change MySQL data directory?
...ed to solve the problem for me on Ubuntu 12.04 (Precise). I found out that one needs to edit the file /etc/apparmor.d/tunables/alias to include a line "alias /var/lib/mysql/ -> /newpath/," With this in place, I did not need any changes in any of the other AppArmor files. It worked immediately aft...
Finding the id of a parent div using Jquery
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$(this).parent().attr("id");
2.
There must be a large number of ways! One could be to hide an element that contains the answer, e.g.
<div>
Volume = <input type="text" />
<button type="button">Check answer</button>
<span style="display: hidden">3.93e-6&...