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String concatenation vs. string substitution in Python
...meit.Timer('so_q_sub(1000)','from __main__ import so_q_sub')
>>> t2 = timeit.Timer('so_q_cat(1000)','from __main__ import so_q_cat')
>>> t1.timeit(number=10000000)
12.166618871951641
>>> t2.timeit(number=10000000)
5.7813972166853773
>>> t1.timeit(number=1)
1.10349...
Fast check for NaN in NumPy
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162
Ray's solution is good. However, on my machine it is about 2.5x faster to use numpy.sum in place...
Running karma after installation results in 'karma' is not recognized as an internal or external com
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321
The command line interface is in a separate package.
To install this use:
npm install -...
How does database indexing work? [closed]
...g on a field that isn’t sorted requires a Linear Search which requires N/2 block accesses (on average), where N is the number of blocks that the table spans. If that field is a non-key field (i.e. doesn’t contain unique entries) then the entire tablespace must be searched at N block accesses.
W...
What is the difference between UNION and UNION ALL?
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26 Answers
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'printf' vs. 'cout' in C++
...e when you print many arguments. If you have to write something like Error 2: File not found., assuming error number, and its description is placeholder, the code would look like this. Both examples work identically (well, sort of, std::endl actually flushes the buffer).
printf("Error %d: %s.\n", i...
Git: How to reuse/retain commit messages after 'git reset'?
...ter:
git commit -C HEAD@{1}
You can use the other options given by @user2718704.
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How to run functions in parallel?
...ing'
for i in xrange(10000000): pass
print 'func1: finishing'
def func2():
print 'func2: starting'
for i in xrange(10000000): pass
print 'func2: finishing'
if __name__ == '__main__':
p1 = Process(target=func1)
p1.start()
p2 = Process(target=func2)
p2.start()
p1.join()
p2.join...
What's the Android ADB shell “dumpsys” tool and what are its benefits?
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248
What's dumpsys and what are its benefit
dumpsys is an android tool that runs on the device an...