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How to remove a key from a Python dictionary?
...xists
>>> import timeit
>>> setup = "d = {i: i for i in range(100000)}"
>>> timeit.timeit("del d[3]", setup=setup, number=1)
1.79e-06
>>> timeit.timeit("d.pop(3)", setup=setup, number=1)
2.09e-06
>>> timeit.timeit("d2 = {key: val for key, val in d.items...
Why is 1/1/1970 the “epoch time”?
...Jan. 1, 1971, measured in sixtieths of a second".
Because of [the] limited range, the epoch was redefined more than once, before the rate was changed to 1 Hz and the epoch was set to its present value.
Several later problems, including the complexity of the present definition, result from Unix time ...
How to pretty print XML from the command line?
...rror: 'ascii' codec can't decode byte 0xc5 in position 805: ordinal not in range(128) in python version you want to define PYTHONIOENCODING="UTF-8": cat some.xml | PYTHONIOENCODING="UTF-8" python -c 'import sys;import xml.dom.minidom;s=sys.stdin.read();print xml.dom.minidom.parseString(s).toprettyxm...
Why am I getting tree conflicts in Subversion?
...runk changes and private branch changes, so
there's no simple contiguous range of revisions to copy over. By
specifying the --reintegrate option, you're asking Subversion to
carefully replicate only those changes unique to your branch. (And in
fact, it does this by comparing the latest trunk...
Calculate the execution time of a method
...orry so much re. exactness (as you've indicated above). Instead I'd take a range of measurements and consider the mean and distribution of those figures.
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Remove all special characters from a string [duplicate]
... and spaces
// Note that the hyphen must go last not to be confused with a range (A-Z)
// and the dot, NOT being special (I know. My life was a lie), is NOT escaped
$str = preg_replace('/[^A-Za-z0-9. -]/', '', $str);
// Replace sequences of spaces with hyphen
$str = preg_replace('/ */', '-', $str...
How to force a web browser NOT to cache images
... header("Pragma: no-cache");
// image related headers
header('Accept-Ranges: bytes');
header('Content-Length: '.strlen( $img )); // How many bytes we're going to send
header('Content-Type: image/jpeg'); // or image/png etc
// actual image
echo $img;
exit();
}
Actually either no-ca...
How efficient can Meteor be while sharing a huge collection among many clients?
...e, each client caused an additional ~60MB of memory usage, even though the raw data transferred was only about 5MB.
In our case, because the collection was static, we solved this problem by sending all the documents as a .json file, which was gzipped by nginx, and loading them into an anonymous col...
Understanding FFT output
...ifies to 1 Hz per bin. The bins N/2 to N represent negative frequencies (strange concept, I know). For your case they don't contain any significant information because they are just a mirror of the first N/2 frequencies.
Your real and imaginary parts of each bin form a complex number. It is okay if ...
C++ convert vector to vector
...
Use std::vector's range constructor:
std::vector<int> intVec;
std::vector<double> doubleVec(intVec.begin(), intVec.end());
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