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Add a prefix string to beginning of each line
...x is a bit complicated, just put it in a variable:
prefix=path/to/file/
Then, you pass that variable and let awk deal with it:
awk -v prefix="$prefix" '{print prefix $0}' input_file.txt
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Extract a regular expression match
...up references in the replacement. Anything in parentheses gets remembered. Then they're accessed by \2, the first item. The first backslash escapes the backslash's interpretation in R so that it gets passed to the regular expression parser.
gsub('([[:alpha:]]+)([0-9]+)([[:alpha:]]+)', '\\2', "aaa12...
Extract value of attribute node via XPath
...d nodes belonging to the Parent specified by its predicate [@id=1]. You'll then need to change the predicate to [@id=2] to get the set of child nodes for the next Parent.
However, if you ignore the Parent node altogether and use:
//child/@name
you can select name attribute of all child node...
Regular expression for a hexadecimal number?
...B. Your shorthand is only valid if using perl regex, if using POSIX regex, then Steven's solution is the shortest. Either way, Steven's solution works for both perl and POSIX regex.
– David M. Syzdek
Feb 10 '12 at 1:39
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Check if a class is derived from a generic class
...meType>(object t)
{
return (t is GenericClass<SomeType>);
}
Then you would test like this:
bool test1 = IsTypeofGenericClass<SomeType>(t);
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Timeout function if it takes too long to finish [duplicate]
...uld easily add in a decorator @timeout.timeout as a static method to this. Then, you could easily choose between a decorator or a with statement.
– Kevin
Oct 15 '15 at 18:09
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prevent refresh of page when button inside form clicked
...riggers the form submission. If you make the getData function return false then it should stop the form from submitting.
Alternatively, you could also use the preventDefault method of the event object:
function getData(e) {
e.preventDefault();
}
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in Ipython notebook / Jupyter, Pandas is not displaying the graph I try to plot
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start ipython with ipython notebook --pylab inline ,then graph will show inline.
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jQuery select by attribute using AND and OR operators
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First find the condition that occurs in all situations, then filter the special conditions:
$('[myc="blue"]')
.filter('[myid="1"],[myid="3"]');
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Get raw POST body in Python Flask regardless of Content-Type header
...orm-data, application/x-www-form-urlencoded, or application/x-url-encoded) then the raw data will be consumed. request.data and request.json will appear empty in this case.
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