Popular recipes tagged "network" but not "messenger"

Print Directly from web application to POS/EPS thermal printer (PHP)

2014-09-01T14:55:56-07:00

PHP recipe 578925 by imam ferianto (kasir, network, over, php, pos, printer, tiketing). Revision 2.

this php script will printout barcode label directly from the web by phpscript

Installed Modules (Perl)

2015-07-17T04:18:15-07:00

Perl recipe 579084 by Roger Mbiama Assogo (application, debugging, network).

Additional Perl modules are installed on the server (aside from the standard libraries) run from a web broswer.

Wait for network service to appear (Python)

2014-11-06T07:29:12-08:00

Python recipe 578955 by Mohammad Taha Jahangir (network, socket).

This script allows you to wait until specified port is opened on remote server. This can be useful in automation jobs - restarting server, wake on lan etc. It can also be used for monitoring distant service/site.

The main problem that this script solves is that you need to handle two different timeouts when opening probing socket, and it is not described in python documentation. See http://bugs.python.org/issue5293 for more information.

Teach your computer a few tricks (Python)

2014-09-11T06:25:14-07:00

Python recipe 578932 by Alexander Pletzer (anl, back, network, neural, propagation).

Following is an artifical neural network program that takes any number of inputs and any number of hidden layers, and spits out an output. It applies back propagation with regularization to minimize the cost function. A gradient descent algorithm tries to find the minimum of the cost function in the landscape of weights.

Read text data from the network port (Python)

2012-12-04T20:17:59-08:00

Python recipe 578355 by anatoly techtonik (network).

Here is a way to wait for incoming text on some port and print it to the screen. This is the best technique I could come up with.

WebSocket interface (Python)

2012-11-25T16:52:21-08:00

Python recipe 578348 by Nick Faro (javascript, network, socket, websocket). Revision 2.

This tries its best to be a replacement for the regular socket module.

It supports only sending and receiving but should be useful enough.

The only real difference should be that you can't specify the number of bytes is received, instead do

for message in socket.recv():
    print(message)

Revision 2: Added proper message receiving. Previously it just requested a ton of data. Now it reads 2 bytes, determines the length, then requests that much.

Genetic Algorithm in Python source code - AI-Junkie tutorial (Python)

2012-06-19T12:59:13-07:00

Python recipe 578128 by David Adler (algorithm, artificial, genetic, network, neural, python). Revision 5.

A simple genetic algorithm program. I followed this tutorial to make the program http://www.ai-junkie.com/ga/intro/gat1.html.

The objective of the code is to evolve a mathematical expression which calculates a user-defined target integer.

KEY:

chromosome = binary list (this is translated/decoded into a protein in the format number --> operator --> number etc, any genes (chromosome is read in blocks of four) which do not conform to this are ignored.

protein = mathematical expression (this is evaluated from left to right in number + operator blocks of two)

output = output of protein (mathematical expression)

error = inverse of difference between output and target

fitness score = a fraction of sum of of total errors

OTHER:

One-point crossover is used.

I have incorporated elitism in my code, which somewhat deviates from the tutorial but made my code more efficient (top ~7% of population are carried through to next generation)

dhcp query (Python)

2011-04-10T15:41:14-07:00

Python recipe 577649 by hassane (dhcp, ipv4, network, query, querying_dhcp_for_free_ip_address).

a simple python script that sends a dhcp discover packet and recieves the dhcp offer that contains a suggested ip address, gateway, dns servers and displays them.

Show all the telecommuting jobs from the Python Job Board (Python)

2011-12-09T07:38:28-08:00

Python recipe 577979 by Victor Yang (html, network, screenscrape).

It is running as a cronjob on a VPS(Virutal Private Server). The output html can be served by any web server.

Send an HTML email with embedded image and plain text alternate (Python)

2011-06-12T18:38:14-07:00

Python recipe 577751 by soham vaghela (network).

HTML is the method of choice for those wishing to send emails with rich text, layout and graphics. Often it is desirable to embed the graphics within the message so recipients can display the message directly, without further downloads.

Some mail agents don't support HTML or their users prefer to receive plain text messages. Senders of HTML messages should include a plain text message as an alternate for these users.

This recipe sends a short HTML message with a single embedded image and an alternate plain text message.

Send an HTML email with embedded image and plain text alternate (Python)

2011-06-12T18:38:47-07:00

Python recipe 577752 by soham vaghela (network).

Some mail agents don't support HTML or their users prefer to receive plain text messages. Senders of HTML messages should include a plain text message as an alternate for these users.

This recipe sends a short HTML message with a single embedded image and an alternate plain text message.

ASIO Proxy (Python)

2011-04-17T15:08:30-07:00

Python recipe 577663 by Aaron Riekenberg (network).

TCP proxy implemented using asio.

ASIO (Python)

2011-04-17T15:03:23-07:00

Python recipe 577662 by Aaron Riekenberg (network).

Asynchronous TCP socket service

NBD server in python (Python)

2011-02-08T20:59:23-08:00

Python recipe 577569 by Dima Tisnek (analyze, block, device, disk, io, linux, nbd, network, python).

Linux Network Block Device server in Python

This is a simplified version based on Kragen Sitaker's http://lists.canonical.org/pipermail/kragen-hacks/2004-May/000397.html

Close is never actually called, at least not on the same connection -- linux C nbd-client -d seems to stall, perhaps it tries to open another socket?

This code doesn't check for error conditions, failed reads/writes, past end of disk, etc.

It prints io requests, you can analyze filesystem and user program io patterns.

Monkey-patch execnet with more ssh settings, port, identity file, non-interactive (Python)

2011-01-15T16:35:00-08:00

Python recipe 577545 by Dima Tisnek (batchmode, execnet, identity, key, network, noninteractive, port, public, python, ssh).

execnet ( http://codespeak.net/execnet/ ) is pretty cool, but its ssh support needs a few tweaks, here they are.

This snipped is a monkey patch, not a diff, import it and you can use execnet.makeportgateway instead of makegateway.

Adapt to your needs even more!

Send an HTML email with embedded image and plain text alternate (Python)

2006-01-29T18:40:36-08:00

Python recipe 473810 by darrin massena (network).

Some mail agents don't support HTML or their users prefer to receive plain text messages. Senders of HTML messages should include a plain text message as an alternate for these users.

This recipe sends a short HTML message with a single embedded image and an alternate plain text message.

Simplest example of serving a browser request (Python)

2010-10-15T21:17:30-07:00

Python recipe 577428 by Kaushik Ghose (network, webserver).

This is the simplest way I have found of sending information from a python program to a browser

IP and MAC addresses (Python)

2016-07-07T17:52:15-07:00

Python recipe 577191 by Jean Brouwers (ios, ip, ipv4, mac, macos, network, python2_4, python3_5, uuid, windows). Revision 3.

This module collects all IP and MAC addresses from several available sources on the underlying system. See the module documentation for more details, supported Python releases and platforms.

IP address and CIDR mask conversion to network and broadcast (Python)

2010-08-25T21:37:16-07:00

Python recipe 577375 by Rafael Zanella (cidr, ipv4, mask, network). Revision 2.

Convert dotted-quad IPv4 addresses along with CIDR mask to host-byte-order long integer ip, network and broadcast, along with their dotted-quad IPv4 representation.

Run asynchronous tasks using coroutines (Python)

2010-08-06T16:16:20-07:00

Python recipe 577129 by Arnau Sanchez (coroutine, event, generator, gobject, gtk, gui, network, nonblocking, pygtk). Revision 20.

This recipe shows a simple, transparent (and hopefully pythonic) way of running asynchronous tasks when writing a event-driven application (i.e. GUI). The aim is to allow a programmer to write time-consuming functions (usually IO-bound, but not only) with sequential-looking code, instead of scattering the logic over a bunch of callbacks. We will take advantage of the coroutines introduced in Python 2.5 (see http://www.python.org/dev/peps/pep-0342).

The goal: wouldn't it be great if we could write something like this?

def myjob(entry, arg1, arg2, arg3):
    result1 = function_that_takes_eons_to_complete(arg1, arg2)    
    result2 = another_function_that_downloads_a_big_really_big_file(result1, arg3)
    entry.set_text("The result is: %d" % result2)

def on_start_button___clicked(button, entry):
    myjob(entry, 1, 2, 3)

...    
gtk.main()

Indeed, but we can't! The GUI will hang until the job is done and the user will be rightfully angry. Coroutines to the rescue: the absolute minimal change we can make to this code is transforming myjob into a coroutine and yield every time we do blocking stuff:

def myjob(entry, arg1, arg2, arg3):
    result1 = yield some_task(arg1, arg2)    
    result2 = yield some_other_task(result1, arg3)
    entry.set_text("The result is: %d" % result2)

def on_start__clicked(button, entry):
    start_job(myjob(entry, 1, 2, 3))

some_task and some_other_task are here the asynchronous implementation of the sequential tasks used in the first fragment, and start_job the wrapper around the coroutine. Note that we still have to implement non-blocking versions of the tasks, but they are usually pretty generic (wait some time, download a file, ...) and can be re-used. If you happen to have a CPU-bound function or even a IO-bound code you cannot split (urllib2 anyone?), you can always use a generic threaded task (granted, the whole point of using co-routines should be avoiding threads, but there is no alternative here).

At the end, all the plumbing we need to make it work is just 1 function: start_job (wrapper around the job to manage the flow of the coroutine). The rest of the code -two asynchronous tasks (sleep_task, threaded_task) and a demo app- are shown solely as an example.