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How to perform OR condition in django queryset?
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Because QuerySets implement the Python __or__ operator (|), or union, it just works. As you'd expect, the | binary operator returns a QuerySet so order_by(), .distinct(), and other queryset filters can be tacked on to the end.
combined_queryset = User.obje...
Using a piano keyboard as a computer keyboard [closed]
...he underlying hardware (in your case, the piano keyboard). For Windows and Linux, you're probably going to want to use C for that.
However, since you're just generating keystrokes (not trying to intercept them, which I was trying to do years ago), you may be able to use whatever features the operat...
Bash script to cd to directory with spaces in pathname
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When working under Linux the syntax below is right:
cd ~/My\ Code
However when you're executing your file, use the syntax below:
$ . cdcode
(just '.' and not './')
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Where does R store packages?
...lation and Administration' manual that came with your installation.
On my Linux box:
R> .libPaths()
[1] "/usr/local/lib/R/site-library" "/usr/lib/R/site-library"
[3] "/usr/lib/R/library"
R>
meaning that the default path is the first of these. You can override that via an ...
How can I programmatically create a new cron job?
...st make sure the version of cron in use supports /etc/cron.d/. Most modern Linux distributions do.
– sleske
Mar 6 '09 at 11:09
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开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...一个外部命令，如流行的本地投递代理procmail。在流行的linux发行版本RedHat中，我们就使用procmail作为最终的本地投递代理。
远程投递代理SMTP进程根据收件人地址查询一个SMTP服务器列表，按照顺序连接每一个SMTP服务器，根据性...
What is the difference between declarative and imperative programming? [closed]
...ve language is when you say how to get what you want.
A simple example in Python:
# Declarative
small_nums = [x for x in range(20) if x < 5]
# Imperative
small_nums = []
for i in range(20):
if i < 5:
small_nums.append(i)
The first example is declarative because we do not speci...
String comparison in bash. [[: not found
...but better workaround would be to use update-alternatives (in debian-based-linux) like this justinconover.wordpress.com/2012/05/14/… but in the end, it would be the same.
– jperelli
Mar 8 '16 at 13:53
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Why functional languages? [closed]
...t functional programming features and you can do functional programming in Python too. I think the reasons for the popularity of functional programming is mostly because of two reasons: Concurrency is getting to be a real problem in normal programming because we're getting more and more multiprocess...
What is this Javascript “require”?
...languages with minor differences in syntax and behavior, like C's include, Python's import, and so on.
One big difference between Node.js modules and browser JavaScript is how one script's code is accessed from another script's code.
In browser JavaScript, scripts are added via the <script>...