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Python memory usage of numpy arrays
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The field nbytes will give you the size in bytes of all the elements of the array in a numpy.array:
size_in_bytes = my_numpy_array.nbytes
Notice that this does not measures "non-element attributes of the array object" so the actual size in bytes can be a few bytes larger th...
Selecting the last value of a column
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Both instances of ROW can be replaced by COLUMN in order to return the last value in a particular row (instead of the last value in a particular column).
– Jon Schneider
Mar 10 '13 at 4:29
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Is the pImpl idiom really used in practice?
...hose benefits come at a cost: an extra level of indirection is required in order to access the implementation methods.
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Best way to test if a row exists in a MySQL table
...RE ...)
and per the documentation, you can SELECT anything.
Traditionally, an EXISTS subquery starts with SELECT *, but it could
begin with SELECT 5 or SELECT column1 or anything at all. MySQL
ignores the SELECT list in such a subquery, so it makes no difference.
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How to make a python, command-line program autocomplete arbitrary things NOT interpreter
...ts, i.e. --help, --verbose and --version. For your purposes, you'll essentially want to customise the values that are put into opts.
Do have a look at the example on the linked page, it's all pretty straightforward.
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Kill child process when parent process is killed
...plication dies, you are still left with child processes running. What we really want is for the child processes to die as soon as the main process dies.
The solution is to use "job objects" http://msdn.microsoft.com/en-us/library/ms682409(VS.85).aspx.
The idea is to create a "job object" for your ...
How to deal with INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES without uninstall?
I tried to reinstall an apk
16 Answers
16
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How to use count and group by at the same select statement
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If you want to order by count (sound simple but i can`t found an answer on stack of how to do that) you can do:
SELECT town, count(town) as total FROM user
GROUP BY town ORDER BY total DESC
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How do I remove a property from a JavaScript object?
...t object, then that object will, of course, not be garbage collected until all references to it have disappeared.
delete will only work on properties whose descriptor marks them as configurable.
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Javascript - Append HTML to container element without innerHTML
...;
font-size: 30px;
outline: none;
padding: 0 20px;
transition: all .3s;
}
button:hover {
background: rgba(7, 99, 53, 1);
color: rgba(255,255,255,1);
}
p {
font-size: 20px;
font-weight: bold;
}
<button type="button" onclick="addChild()">Append Child</button>
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