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In javascript, is an empty string always false as a boolean?
...Yes. Javascript is a dialect of ECMAScript, and ECMAScript language specification clearly defines this behavior:
ToBoolean
The result is false if the argument is the empty String (its length is zero);
otherwise the result is true
Quote taken from http://www.ecma-international.org/publications/file...
Signal handling with multiple threads in Linux
... which is received by and handled by root thread. Using POSIX threads, you can also sent SIGTERM to individual threads as well, but I suspect you are asking about what happens when the OS sends the signal to the process.
In 2.6, SIGTERM will cause child threads to exit "cleanly", where as 2.4, chil...
How can I install from a git subdirectory with pip?
...hould be a path starting from root of the project to where setup.py
is located.
So if your repository layout is:
- pkg_dir/
- setup.py # setup.py for package ``pkg``
- some_module.py
- other_dir/
- some_file
- some_other_file
You'll need to use
pip install -e vcs+protocol://re...
Get current batchfile directory
...
System read-only variable %CD% keeps the path of the caller of the batch, not the batch file location.
You can get the name of the batch script itself as typed by the user with %0 (e.g. scripts\mybatch.bat). Parameter extensions can be applied to this so %~dp0 will return the ...
Django FileField with upload_to determined at runtime
...ey(User)
file = models.FileField(upload_to=content_file_name)
As you can see, you don't even need to use the filename given - you could override that in your upload_to callable too if you liked.
share
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Difference between and text
...t" value="text">text</button>. Better yet: don't use the value, because if you add HTML it becomes rather tricky what is received on server side. Instead, if you must send an extra value, use a hidden field.
Button with <input>
As with:
<input type="button" />
By default, t...
What is the meaning of erb?
Why is the view of Rails application in the format *.erb.html ? What does "erb" mean?
6 Answers
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Why is '+' not understood by Python sets?
...
Python sets don't have an implementation for the + operator.
You can use | for set union and & for set intersection.
Sets do implement - as set difference. You can also use ^ for symmetric set difference (i.e., it will return a new set with only the objects that appear in one set but ...
Setting design time DataContext on a Window is giving a compiler error?
I have the following XAML below for the main window in my WPF application, I am trying to set the design time d:DataContext below, which I can successfully do for all my various UserControls, but it gives me this error when I try to do it on the window...
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How to view the Folder and Files in GAC?
...hen you are going to install an assembly you have to specify where gacutil can find it, so you have to provide a full path as well. But when an assembly already is in GAC - gacutil know a folder path so it just need an assembly name.
MSDN:
How to: Install an Assembly into the Global Assembly Cach...