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How to get first element in a list of tuples?
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253
>>> a = [(1, u'abc'), (2, u'def')]
>>> [i[0] for i in a]
[1, 2]
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Responsive image align center bootstrap 3
I do a catalog using Bootstrap 3. When displayed on tablets, the product images look ugly because of their small size (500x500) and a width of 767 pixels in the browser. I want to put the image in the center of the screen, but for some reason I can not. Who be will help solve the problem?
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Remove border from IFrame
...e capital ‘B’).
So it would look like:
<iframe src="myURL" width="300" height="300" frameBorder="0">Browser not compatible.</iframe>
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How to get a substring of text?
I have text with length ~700. How do I get only ~30 of its first characters?
5 Answers
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What is more efficient? Using pow to square or just multiply it with itself?
... elapsed << " "; \
\
return x; \
}
TEST(1, b)
TEST(2, b*b)
TEST(3, b*b*b)
TEST(4, b*b*b*b)
TEST(5, b*b*b*b*b)
template <int exponent>
double testpow(double base, long loops)
{
double x = 0.0;
boost::posix_time::ptime startTime = now();
for (long i=0; i<loops; ++i)
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Average of 3 long integers
I have 3 very large signed integers.
12 Answers
12
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Catching error codes in a shell pipe
...ng uses:
tmp=${TMPDIR:-/tmp}/mine.$$
trap 'rm -f $tmp.[12]; exit 1' 0 1 2 3 13 15
...if statement as before...
rm -f $tmp.[12]
trap 0 1 2 3 13 15
The first trap line says 'run the commands 'rm -f $tmp.[12]; exit 1' when any of the signals 1 SIGHUP, 2 SIGINT, 3 SIGQUIT, 13 SIGPIPE, or 15 SIGTERM o...
What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL?
...8 to 127 0 to 255
smallint | 2 bytes -32768 to 32767 0 to 65535
mediumint | 3 bytes -8388608 to 8388607 0 to 16777215
int/integer | 4 bytes -2147483648 to 2147483647 0 to 4294967295
bigi...
Append value to empty vector in R?
...length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.340 0.000 0.343
vector <- character(length(values))
# fast(er)
system.time( for (i in 1:length(values)) vector[i] <- values[i] )
# user system elapsed
# 0.024 0.000 0.023
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Getting list of lists into pandas DataFrame
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3 Answers
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