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Grep characters before and after match?
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3 characters before and 4 characters after
$> echo "some123_string_and_another" | grep -o -P '.{0,3}string.{0,4}'
23_string_and
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Encode URL in JavaScript?
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2847
Check out the built-in function encodeURIComponent(str) and encodeURI(str).
In your case, thi...
jQuery get value of select onChange
...alue );
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<select>
<option value="1">One</option>
<option value="2">Two</option>
</select>
You can also reference with onchange event-
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How to get the first column of a pandas DataFrame as a Series?
...>>> import pandas as pd
>>> df = pd.DataFrame({'x' : [1, 2, 3, 4], 'y' : [4, 5, 6, 7]})
>>> df
x y
0 1 4
1 2 5
2 3 6
3 4 7
>>> s = df.ix[:,0]
>>> type(s)
<class 'pandas.core.series.Series'>
>>>
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Logical XOR operator in C++?
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answered Oct 20 '09 at 19:03
Greg HewgillGreg Hewgill
783k167167 gold badges10841084 silver badges12221222 bronze badges
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C++常用排序算法汇总 - C/C++ - 清泛网 - 专注C/C++及内核技术
...****************************
* 简单选择排序
* 稳定排序，O{n^2} ~ O{n^2}
* 从首位开始，循环一次找出一个比首位小的值，交换
*
* https://www.tsingfun.com
************************************/
#include<stdio.h>
#include<stdlib.h>
/*
第一种形式的选...
Invalid syntax when using “print”? [duplicate]
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232
That is because in Python 3, they have replaced the print statement with the print function.
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Python - Count elements in list [duplicate]
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edited Dec 4 '14 at 23:26
Charlie
6,5134545 silver badges5050 bronze badges
answered Nov 9 '10 at ...
How do we determine the number of days for a given month in python [duplicate]
...ulate the number of days for a given month in python. If a user inputs Feb 2011 the program should be able to tell me that Feb 2011 has 28 days. Could any one tell me which library I should use to determine the length of a given month.
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Iterating over a numpy array
...think you're looking for the ndenumerate.
>>> a =numpy.array([[1,2],[3,4],[5,6]])
>>> for (x,y), value in numpy.ndenumerate(a):
... print x,y
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0 0
0 1
1 0
1 1
2 0
2 1
Regarding the performance. It is a bit slower than a list comprehension.
X = np.zeros((100, 100, 100))
%...