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What does -XX:MaxPermSize do?
...eneration.
Permanent Generation: The Permanent Generation is where class files are kept. These are the result of compiled classes and JSP pages. If this space is full, it triggers a Full Garbage Collection. If the Full Garbage Collection cannot clean out old unreferenced classes and there is no ro...
Django select only rows with duplicate field values
...mport Count
Literal.objects.values('name')
.annotate(Count('id'))
.order_by()
.filter(id__count__gt=1)
This is as close as you can get with Django. The problem is that this will return a ValuesQuerySet with only name and count. However, you can then us...
Using print statements only to debug
...worked with before, using formulae never seen before and dealing with huge files. All this made me write a lot of print statements to verify if it's all going right and identify the points of failure. But, generally, outputting so much information is not a good practice. How do I use the print stat...
Pointers in Python?
...arbitrary computations to be performed in response).
Now, your "actual desiderata" example is mysterious because in each case two levels of indexing or attribute-getting are involved, so the subtlety you crave could be introduced in many ways. What other attributes is form.field suppose to have, f...
How to make a smaller RatingBar?
...
The default RatingBar widget is sorta' lame.
The source makes reference to style "?android:attr/ratingBarStyleIndicator" in addition to the "?android:attr/ratingBarStyleSmall" that you're already familiar with. ratingBarStyleIndicator is slightly...
How do I access the command history from IDLE?
...
You can always edit the file config-keys.cfg found under ~/.idlerc by default; look for the entry "history-previous" and set it to as below...
history-previous = <Key-Up>
Done.
...
Android set height and width of Custom view programmatically
...the layout where the graphView is placed. For example if in the XML layout file graphView is placed inside RelativeLayout, then you should use new RelativeLayout.LayoutParams(width, height)
– Vic
Feb 10 '19 at 14:51
...
What is the 
 character?
...
Oct Dec Hex Name
012 10 0A Line Feed
In the html file you can use Dec and Hex representation of charters
The Dec is represented with &#10;
The Hex is represented with &#x0A (or you can omit the leading zero &#xA)
There is a good converter at https://r12a.git...
MySQL和MongoDB设计实例进行对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...数表来单独保存。
CREATE TABLE IF NOT EXISTS `mobiles` (
`id` int(10) unsigned NOT NULL AUTO_INCREMENT,
`name` VARCHAR(100) NOT NULL,
`brand` VARCHAR(100) NOT NULL,
PRIMARY KEY (`id`)
);
CREATE TABLE IF NOT EXISTS `mobile_params` (
`id` int(10) unsigned NOT NUL...
两种js滑动门(tab切换)效果 - 源码下载 - 清泛网 - 专注C/C++及内核技术
...d: #fff;
text-align: center;
margin: 0;
}
.nTab{
float: left;
width: 960px;
margin: 0 auto;
border-bottom:1px #AACCEE solid;
background:#d5d5d5;
background-position:left;
background-repeat:repeat-y;
margin-bottom:2px;
}
.nTab .TabTitle{
clear: both;
height: 22px;
ov...