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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...tinct from any other invocation of this
constructor.
could be extended by "across threads" and "uncorrelated"
Seed Sequence Quality
But the randomness of the seeding sequence is only as good as the underlying RNG.
The RNG used for the seed sequence in this java implementation uses a multiplic...
Redis is single-threaded, then how does it do concurrent I/O?
...pporting concurrent I/Os means the server is able to serve several clients by executing several flows corresponding to those clients with only one computation unit. In this context, parallelism would mean the server is able to perform several things at the same time (with multiple computation units)...
What is an uninterruptible process?
...appens to be in a system call (kernel function) that cannot be interrupted by a signal.
To understand what that means, you need to understand the concept of an interruptible system call. The classic example is read(). This is a system call that can take a long time (seconds) since it can potentiall...
What does if __name__ == “__main__”: do?
... as the main program.
__name__ = "__main__"
When Your Module Is Imported By Another
On the other hand, suppose some other module is the main program and it imports your module. This means there's a statement like this in the main program, or in some other module the main program imports:
# Suppose...
Java Interfaces/Implementation naming convention [duplicate]
...ations in which you wish to simplify your code and make it easily testable by relying on injected interface implementations (which may also be proxied - your code doesn't know!). Even if you only have two implementations - one a Mock for testing, and one that gets injected into the actual productio...
Difference between “module.exports” and “exports” in the CommonJs Module System
...lows:
(function (exports, require, module, __filename, __dirname) { //add by node
var greet = function () {
console.log('Hello World');
};
module.exports = greet;
}).apply(); //add by node
return module.exports; ...
What's the difference between EscapeUriString and EscapeDataString?
...d URI might change its semantics.
While the quoted RFC has been obsoleted by RFC 3986, the point still stands. Let's verify it by looking at some concrete examples:
You have a simple URI, like this:
http://example.org/
Uri.EscapeUriString won't change it.
You decide to manually edit the query...
Is there a list of Pytz Timezones?
...ocked when I first found it out. (Interestingly enough, the pytz installed by yum on CentOS 7 does not exhibit this problem.)
import pytz
import dateutil.tz
from datetime import datetime
print((datetime(2017,2,13,14,29,29, tzinfo=pytz.timezone('Asia/Shanghai'))
- datetime(2017,2,13,14,29,29, t...
What is the purpose of the -m switch?
...distinct ways: modulename and filename. In general, modules are identified by modulename in Python code (e.g., import <modulename>) and by filename on the command line (e.g., python <filename>). All python interpreters can convert modulenames to filenames by following same few, well-defi...
How do I avoid the specification of the username and password at every git push?
...d_rsa.pub into the field labeled 'Key'.
If your repository is administered by somebody else, give the administrator your id_rsa.pub.
If your remote repository is administered by your, you can use this command for example:
scp ~/.ssh/id_rsa.pub YOUR_USER@YOUR_IP:~/.ssh/authorized_keys/id_rsa.pub
...