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How to extract one column of a csv file
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You could use awk for this. Change '$2' to the nth column you want.
awk -F "\"*,\"*" '{print $2}' textfile.csv
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Focus Input Box On Load
...ction() {
var input = document.getElementById("myinputbox").focus();
}
2) How to place cursor at the end of the input text?
Here's a non-jQuery solution with some borrowed code from another SO answer.
function placeCursorAtEnd() {
if (this.setSelectionRange) {
// Double the length bec...
How to return a part of an array in Ruby?
...ndex) are out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] #=> nil
a[1, 2] #=> [ "b", "c" ]
a[1..3] #=> [ "b", "c", "d" ]
a[4..7] #=> [ "e...
Explicitly select items from a list or tuple
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list( myBigList[i] for i in [87, 342, 217, 998, 500] )
I compared the answers with python 2.5.2:
19.7 usec: [ myBigList[i] for i in [87, 342, 217, 998, 500] ]
20.6 usec: map(myBigList.__getitem__, (87, 342, 217, 998, 500))
22.7 usec: itemgetter(87, 342, ...
Pandas: drop a level from a multi-level column index?
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321
You can use MultiIndex.droplevel:
>>> cols = pd.MultiIndex.from_tuples([("a", "b"), (...
How to perform element-wise multiplication of two lists?
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287
Use a list comprehension mixed with zip():.
[a*b for a,b in zip(lista,listb)]
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C++ performance challenge: integer to std::string conversion
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#include <string>
const char digit_pairs[201] = {
"00010203040506070809"
"10111213141516171819"
"20212223242526272829"
"30313233343536373839"
"40414243444546474849"
"50515253545556575859"
"60616263646566676869"
"70717273747576777879"
"8081828384858...
How do you convert a byte array to a hexadecimal string, and vice versa?
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How do I forward parameters to other command in bash script?
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245
Use the shift built-in command to "eat" the arguments. Then call the child process and pass it...
What is the Java string pool and how is “s” different from new String(“s”)? [duplicate]
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answered Mar 21 '10 at 6:24
Andrew HareAndrew Hare
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