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Mercurial stuck “waiting for lock”
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492
When "waiting for lock on repository", delete the repository file: .hg/wlock (or it may be in .h...
Is it possible to allow didSet to be called during initialization in Swift?
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edited Nov 20 '19 at 11:46
Nik Kov
9,00633 gold badges5252 silver badges8484 bronze badges
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Overriding a Rails default_scope
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152
Short answer: Do not use default_scope unless you really have to. You'll probably be better off...
String formatting named parameters?
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In Python 2.6+ and Python 3, you might choose to use the newer string formatting method.
print('<a href="{0}">{0}</a>'.format(my_url))
which saves you from repeating the argument, or
print('<a href="{url}">{url}&l...
Try-finally block prevents StackOverflowError
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332
It doesn't run forever. Each stack overflow causes the code to move to the finally block. The pr...
Drop columns whose name contains a specific string from pandas DataFrame
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import pandas as pd
import numpy as np
array=np.random.random((2,4))
df=pd.DataFrame(array, columns=('Test1', 'toto', 'test2', 'riri'))
print df
Test1 toto test2 riri
0 0.923249 0.572528 0.845464 0.144891
1 0.020438 0.332540 0.144455 0.741412
cols = [c for...
Image inside div has extra space below the image
...y dog <img src="https://upload.wikimedia.org/wikipedia/commons/thumb/f/f2/VangoghStarry-night2.jpg/300px-VangoghStarry-night2.jpg" alt="">
</div>
<div id="align-middle">
<h1>vertical-align: middle</h1>
The quick brown fox jumps over the lazy dog <img src="htt...
“x not in y” or “not x in y”
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112
They always give the same result.
In fact, not 'ham' in 'spam and eggs' appears to be special c...
Size of Matrix OpenCV
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241
cv:Mat mat;
int rows = mat.rows;
int cols = mat.cols;
cv::Size s = mat.size();
rows = s.heigh...