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Python element-wise tuple operations like sum
... Except that map() is semi-deprecated. See artima.com/weblogs/viewpost.jsp?thread=98196 for an article by Guido where it mentions how map is better written as a list comprehension.
– Adam Parkin
Feb 13 '12 at 21:07
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LINGO使用指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...自然对数
@sign(x) 如果x<0返回-1；否则，返回1
@floor(x) 返回x的整数部分。当x>=0时，返回不超过x的最大整数；当x<0时，返回不低于x的最大整数。
@smax(x1,x2,…,xn) 返回x1，x2，…，xn中的最大值
@smin(x1,x2,…,xn) 返...
How to pull a random record using Django's ORM?
...e_or_none = Model.objects.raw('''
select * from {0} limit 1
offset floor(random() * (select count(*) from {0}))
'''.format(Model._meta.db_table)).first()
Be aware that this will raise an index error if the table is empty. Write yourself a model-agnostic helper function to check for that.
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HTML5 Video Dimensions
...Id("id_video");
var width = v.offsetWidth;
v.height = Math.floor(width*(9/16)); // dynamically setting video height to maintain aspect ratio
},
});
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jQuery AJAX cross domain
...ticles finally figured it out. Here is my summary.
server script (.php, .jsp, ...) must return http response header Access-Control-Allow-Origin: *
before using jQuery ajax set this flag in javascript: jQuery.support.cors = true;
you may set flag once or everytime before using jQuery ajax function...
Looping in a spiral
...// a the position on the current square
// n = p + a
var r = Math.floor((Math.sqrt(n + 1) - 1) / 2) + 1;
// compute radius : inverse arithmetic sum of 8+16+24+...=
var p = (8 * r * (r - 1)) / 2;
// compute total point on radius -1 : arithmetic sum of 8+16+24+...
var en = r...
How to open existing project in Eclipse
...tion under Import->General.
See:
http://help.eclipse.org/helios/index.jsp?topic=%2Forg.eclipse.platform.doc.user%2Ftasks%2Ftasks-importproject.htm
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Attach to a processes output for viewing
... container1 ubuntu bash -c -i "COUNT=0; while true; do echo Keep the dance floor beat going; ((COUNT++)); sleep 1; echo \"Count is: \${COUNT}\"; done;" ``` In another terminal: ``` docker exec -it container1 tail -f /proc/1/fd/1 ```
– JacobWuzHere
Dec 27 '16 ...
Use Fieldset Legend with bootstrap
I'm using Bootstrap for my JSP page.
5 Answers
5
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Getting Spring Application Context
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A good example is JSP tags; their creation is goverened by the servlet container, so they have no choice but to obtain the context statically. Spring provides base Tag classes, and they use BeanFactoryLocators to get the contexts they need.
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