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what is the unsigned datatype?
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Historically in C, if you omitted a datatype "int" was assumed. So "unsigned" is a shorthand for "unsigned int". This has been considered bad practice for a long time, but there is still a fair amount of code out there that uses it.
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Converting a Pandas GroupBy output from Series to DataFrame
...tland"] } )
g1 = df1.groupby( [ "Name", "City"] ).count().reset_index()
Now you have your new dataframe in g1:
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记录一些Mac OS X技巧 - 更多技术 - 清泛网 - 专注C/C++及内核技术
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sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.dynamic_pager.plist
禁用以后，磁盘上还保留着这些交换文件，它们已经没用了，也可以删掉：
sudo rm /private/var/vm/swapfile*
如果要重新启用虚拟内存的话，可以执行这条命令：
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What does the red exclamation point icon in Eclipse mean?
...her problems in a project. The Package Explorer and Project Explorer views now show a new decorator on Java projects and working sets that contain build path errors:
The concrete errors can be seen in the Problems view, and if you open the view menu and select Group By > Java Problem Type, the...
Django admin: How to display a field that is marked as editable=False' in the model?
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+1. Especially if you don't plan to edit the field at all in Admin.
– Manoj Govindan
Oct 19 '10 at 16:05
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Getting the last element of a list
...st get the last element,
without modifying the list, and
assuming you know the list has a last element (i.e. it is nonempty)
pass -1 to the subscript notation:
>>> a_list = ['zero', 'one', 'two', 'three']
>>> a_list[-1]
'three'
Explanation
Indexes and slices can take neg...
find: missing argument to -exec
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I figured it out now. When you need to run two commands in exec in a find you need to actually have two separate execs. This finally worked for me.
find . -type f -name "*.rm" -exec ffmpeg -i {} -sameq {}.mp3 \; -exec rm {} \;
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Toggle button using two image on different state
... Add two images(selected/unselected) in check.xml which will work as two different states of toggle button
– AkashG
Jul 16 '12 at 7:13
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How to use OpenFileDialog to select a folder?
...es panel, and the most horrible — you can't even paste a path there! And now as a programmer I see an advice to use it… Please, don't do it.
– Hi-Angel
Aug 19 '15 at 13:12
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Size of Matrix OpenCV
...n the size of a matrix in OpenCV?. I googled and I am still searching, but if any of you know the answer, please help me.
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