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Python, remove all non-alphabet chars from string
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123
Use re.sub
import re
regex = re.compile('[^a-zA-Z]')
#First parameter is the replacement, seco...
How to check whether a string is Base64 encoded or not
... if a string is base64 encoded or not:
^([A-Za-z0-9+/]{4})*([A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{2}==)?$
In base64 encoding, the character set is [A-Z, a-z, 0-9, and + /]. If the rest length is less than 4, the string is padded with '=' characters.
^([A-Za-z0-9+/]{4})* means the string starts with 0 ...
Creating a CSS3 box-shadow on all sides but one
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margin-left: 20px;
padding: .7em .5em .5em .5em;
font-size: 1.3em;
color: #FFF;
display: inline-block;
text-transform: uppercase;
position: relative;
box-shadow: 0 0 8px 2px #888; /* the shadow */
}
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What Are the Differences Between PSR-0 and PSR-4?
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Alex_Nabu
21133 silver badges1111 bronze badges
answered Jul 21 '14 at 16:07
SeldaekSeldaek
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Confusion between factor levels and factor labels
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131
Very short : levels are the input, labels are the output in the factor() function. A factor has...
How to install a specific version of a ruby gem?
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answered Jun 10 '13 at 14:37
mjsmjs
54.3k2424 gold badges7979 silver badges111111 bronze badges
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Create list of single item repeated N times
....timeit('itertools.repeat(0, 10)', 'import itertools', number = 1000000)
0.37095273281943264
>>> timeit.timeit('[0] * 10', 'import itertools', number = 1000000)
0.5577236771712819
But wait - it's not a fair test...
>>> itertools.repeat(0, 10)
repeat(0, 10) # Not a list!!!
The...
Sorting 1 million 8-decimal-digit numbers with 1 MB of RAM
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36 Answers
36
Active
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What does the constant 0.0039215689 represent?
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383
0.0039215689 is approximately equal to 1/255.
Seeing that this is OpenGL, performance is prob...