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How can I add numbers in a Bash script?
...nal tools you can use:
num=$(awk "BEGIN {print $num1+$num2; exit}")
num=$(python -c "print $num1+$num2")
num=$(perl -e "print $num1+$num2")
num=$(echo $num1 + $num2 | bc) # Whitespace for echo is important
You can also use scientific notation (for example, 2.5e+2).
Common pitfalls:
When se...
Getting the last revision number in SVN?
Using PHP, Perl, or Python (preferably PHP), I need a way to query an SVN database and find out the last revision number sent to SVN. I don't need anything other than that. It needs to be non-intensive (so I do it every 5 minutes as a cron job; SVN's performance should not be affected).
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Correct way to pass multiple values for same parameter name in GET request
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I am describing a simple method which worked very smoothly in Python (Django Framework).
1. While sending the request, send the request like this
http://server/action?id=a,b
2. Now in my backend, I split the value received with a split function which always creates a list.
id_filter = ...
How to pass password to scp?
...it with a tool like expect (there are handy bindings too, like Pexpect for Python).
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Disable migrations when running unit tests in Django 1.7
...n I run tests like this:
DJANGO_SETTINGS_MODULE="myapp.settings_test" python manage.py test
This fools migrate into thinking that the app is unmigrated, and so
every time a test database is created it reflects the current
structure of models.py.
In Django 1.9, this situation is impro...
How do I convert a numpy array to (and display) an image?
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img.show() don't work in ipython notebook.img_pil = Image.fromarray(img, 'RGB') display(img_pil.resize((256,256), PIL.Image.LANCZOS))
– mrgloom
Jun 11 '19 at 10:15
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What is a vertical tab?
... printer control language like postscript.
@Talvi Wilson noted it used in python '\v'.
print("hello\vworld")
Output:
hello
world
The above output appears to result in the default vertical size being one line. I have tested with perl "\013" and the same output occurs. This could be us...
Which timestamp type should I choose in a PostgreSQL database?
...e timezone in the database if possible
Random programming language note: Python's datetime data type is very good at maintaining the distinction between absolute vs relative times (albeit frustrating at first until you supplement it with a library like PyTZ).
EDIT
Let me explain the difference...
How do I pass a class as a parameter in Java?
...u get suggest they didn't want people to do this with Java. Much easier in Python : )
– Andrew Puglionesi
Nov 1 '18 at 23:40
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MVC演化史 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...b MVC？这是因为截获请求的是Controller而不是View。
花絮：Python社区的Django框架宣称自己使用的是MTV，其实质仍然是Web MVC。
Web MVP
在Desktop的时代，微软通过WinForms实现MVP，把组件化编程发挥到了极致，大大提升了开发效率，随着...