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Do HTML WebSockets maintain an open connection for each client? Does this scale?
...end on how well the current AJAX/long-poll model is working. The effort to convert will be non-trivial so in many cases the cost just won't be worth the benefit.
Update:
Useful link: 600k concurrent websocket connections on AWS using Node.js
...
How to properly compare two Integers in Java?
...r are both of numeric type, or
one is of numeric type and the other
is convertible (§5.1.8) to numeric
type, binary numeric promotion is
performed on the operands (§5.6.2).
and for <, <=, > and >= (JLS 15.20.1)
The type of each of the operands of a
numerical comparison ...
Can a C# lambda expression have more than one statement?
...pression using braces, but only the syntax which doesn't use braces can be converted into an expression tree:
// Valid
Func<int, int> a = x => x + 1;
Func<int, int> b = x => { return x + 1; };
Expression<Func<int, int>> c = x => x + 1;
// Invalid
Expression...
Do python projects need a MANIFEST.in, and what should be in it?
...
@Ame I agree, things moved on. Currently I am converting most my projects from pbr to poetry
– Jan Vlcinsky
Dec 28 '18 at 0:57
...
Difference between float and decimal data type
...nversion functions would often create tons of minute differences in values converted from ASCII to float when compared against those in, say, SQLServer. This is rarely true anymore. Testing is the best policy, as it's best to know for certain what the trade-offs are.
– user1899...
Convert python datetime to epoch with strftime
...
If you want to convert a python datetime to seconds since epoch you could do it explicitly:
>>> (datetime.datetime(2012,04,01,0,0) - datetime.datetime(1970,1,1)).total_seconds()
1333238400.0
In Python 3.3+ you can use timestamp(...
R command for setting working directory to source file location in Rstudio
...
This answer can help:
script.dir <- dirname(sys.frame(1)$ofile)
Note: script must be sourced in order to return correct path
I found it in: https://support.rstudio.com/hc/communities/public/questions/200895567-can-user-obtain-the-path-of-current-Project-s-direct...
machine learning libraries in C# [closed]
...; example.Count; i++)
{
instance.setValue(attributes[i], Convert.ToDouble(example[i]));
}
instances.add(instance);
}
return instances;
}
}
public static class Classifier
{
public static TClassifier Build<TClassifier>(TrainingSet training...
Java Byte Array to String to Byte Array
...yte[] to string, string representation of byte[] to byte[] conversion... I convert my byte[] to a string to send, I then expect my web service (written in python) to echo the data straight back to the client.
...
Sending mail from Python using SMTP
...plain'
content="""\
Test message
"""
subject="Sent from Python"
import sys
import os
import re
from smtplib import SMTP_SSL as SMTP # this invokes the secure SMTP protocol (port 465, uses SSL)
# from smtplib import SMTP # use this for standard SMTP protocol (port 25, no...