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What does the NS prefix mean?
... after he quit Apple in 1985, and NextStep was it's operating system (UNIX based) together with the Obj-C language and runtime. Together with it's libraries and tools, NextStep was later renamed OpenStep (which was also the name on an API that NeXT developed together with Sun), which in turn later b...
Any implementation of Ordered Set in Java?
... the impression that since Java 1.6 there were several default collections based on skip lists (like, say, ConcurrentSkipListSet etc.).
– TacticalCoder
Jan 3 '12 at 12:55
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Naming of ID columns in database tables
I was wondering peoples opinions on the naming of ID columns in database tables.
24 Answers
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Modifying a subset of rows in a pandas dataframe
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Use .loc for label based indexing:
df.loc[df.A==0, 'B'] = np.nan
The df.A==0 expression creates a boolean series that indexes the rows, 'B' selects the column. You can also use this to transform a subset of a column, e.g.:
df.loc[df.A==0, '...
Django: Why do some model fields clash with each other?
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The OP isn't using a abstract base class... but if you are, you will find that hard coding the related_name in the FK (e.g. ..., related_name="myname") will result in a number of these conflict errors - one for each inherited class from the base class. Th...
Generating statistics from Git repository [closed]
...ring Gnuplot for graphs, there is also
gitstat (SourceForge) project (web-based git statistics interface), written in PHP and Perl,
Git Statistics, aka gitstats (metrics framework designed to gather statistics on git repositories), written in Python, result of git-statistics project at Google Summe...
Install tkinter for Python
... from sources, but this is usually not the best idea with a binary package-based distro you're apparently running.
It's safer to apt-get install python-tk on your machine(s).
(Works on Debian-derived distributions like for Ubuntu; refer to your package manager and package list on other distribution...
How can I get a file's size in C++? [duplicate]
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Based on @jterm suggestion, opening the stream would be std::ifstream in(filename, std::ios::binary | std::ios::ate); Just to ease everybody's life ;)
– jmpcm
Nov 18 '14 at 11:41
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STL中map容器使用自定义key类型报错详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
...l(143) : error C2784: “bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)”: 无法从“const a”为“const std::_Revranit<_RanIt,_Base> &”推导 模板 参数
1> f:\vs2008\vc\include\xutility(2046) : 参见“std::operator <”的声...
Converting pixels to dp
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@MuhammadBabar This is because 160 dpi (mdpi) is the baseline desity from which other densities are calculated. hdpi for instance is considered to be 1.5x the density of mdpi which is really just another way of saying 240 dpi. See Zsolt Safrany's answer below for all densities....