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Get the first element of each tuple in a list in Python [duplicate]
...[x[0] for x in rows]
Below is a demonstration:
>>> rows = [(1, 2), (3, 4), (5, 6)]
>>> [x[0] for x in rows]
[1, 3, 5]
>>>
Alternately, you could use unpacking instead of x[0]:
res_list = [x for x,_ in rows]
Below is a demonstration:
>>> lst = [(1, 2), (...
How can I debug a .BAT script?
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Eric SchoonoverEric Schoonover
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Print a file's last modified date in Bash
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edited Apr 3 '15 at 22:38
answered May 6 '13 at 2:30
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Preserve Line Breaks From TextArea When Writing To MySQL
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Two solutions for this:
PHP function nl2br():
e.g.,
echo nl2br("This\r\nis\n\ra\nstring\r");
// will output
This<br />
is<br />
a<br />
string<br />
Wrap the input in <pre></pre> tags.
See: W3C Wiki - HTML/Elements/pre
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PHP function to generate v4 UUID
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288
Taken from this comment on the PHP manual, you could use this:
function gen_uuid() {
retu...
Why is [1,2] + [3,4] = “1,23,4” in JavaScript?
... For example var o = { valueOf:function () { return 4; } }; evaluating o + 2; produces 6, a number, evaluating o + '2' produces '42', a string.
To see how the overview table was generated visit http://jsfiddle.net/1obxuc7m/
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momentJS date string add 5 days
i have a start date string "20.03.2014" and i want to add 5 days to this with moment.js but i don't get the new date "25.03.2014" in the alert window.
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How do I put two increment statements in a C++ 'for' loop?
...ve displayed 5,6,7.. for x. What I got was this
i=0 a=5 x=0
i=1 a=6 x=0
i=2 a=7 x=1
i=3 a=8 x=2
i=4 a=9 x=3
However, if I bracketed the expression to force the parser into really seeing a comma operator, I get this
int main(){
int i=0;
int a=5;
int x=0;
for(i=0; i<5; x=(i++,a...
How to take column-slices of dataframe in pandas
I load some machine learning data from a CSV file. The first 2 columns are observations and the remaining columns are features.
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