Popular recipes tagged "meta:loc=65"

Shortcut Utility (Python)

2015-03-29T20:45:57-07:00

Python recipe 579041 by FB36 (desktop, directories, directory, file, files, tkinter, ui, utilities, utility).

I dislike filling my desktop with shortcut icons in Windows. This code enables creating shortcuts in a CSV file.

Humanize decorator (Python)

2013-07-31T16:04:13-07:00

Python recipe 578619 by tomer filiba (decorator, objects, pretty, print).

When you need to inspect Python objects in a human-readable way, you're usually required to implement a custom __str__ or __repr__ which are just boilerplate (e.g., return "Foo(%r, %r, %r)" % (self.bar, self.spam, self.eggs). You may implement __str__ and __repr__ by a base-class, but it's hard to call it inheritance and moreover, you may wish to remove it when you're done debugging.

This simple (yet complete) recipe is a class decorator that injects __str__ and __repr__ into the class being printed. It handles nesting and even cycle detection, allowing you to just plug it into existing classes to get them pretty-printed and perhaps remove it later.

Create .CAB or .ZIP with batch (Batch)

2012-11-01T18:33:32-07:00

Batch recipe 578315 by greg zakharov (cab, cscript, zip).

Naturally, commnad language hasn't native methods to create archives but there is no obstacle to use JScript inside a batch. By the way, this do not need creation temporary files. OK, how does it work? Maybe you heard about conditional compilation in JScript, so you must be familiar with this trick. Take a look at this:

actorish decorator for making async code look more like sync one and a less blocking (Python)

2011-10-30T19:59:44-07:00

Python recipe 577931 by Przemyslaw Podczasi (actor, threading).

I like how gevent is making async code to look like sync but non blocking without all the ugly callbacks. I tried doing that with threads and object proxy (I found great one at: http://pypi.python.org/pypi/ProxyTypes written by Phillip J. Eby, and this is where the actual magic happens).

For every function that is decorated it returns a proxy and the io call (or anything else) won't block until the value is actually needed. (should be some pools and args pickling there, to make it more like message passing but I didn't want to fuzzy the example) To use it as actor model, I guess it would require to queue requests to decorated object's methods and create a single thread to process them an in LazyProxy callback set q.get() instead of t.join()

Filling command line arguments with a file (Python)

2011-10-24T13:13:04-07:00

Python recipe 577918 by obernard78+activestate (argparse).

This is a recipe to populate command line args with the content of a file.

It is also an example of how to use the Action class from the argparse module.

I use this script in order to put frequently used options (such as for the scripts I write in config files. I created an abstract class in order to inherit from it to implement several file formats. Choice has been taken not to keep the file name in parsed args, but it can be done by adding: setattr(namespace, self.dest, values) at the end of the __call__ method.

Test functions at the end (even if the ugliest I've ever written and seen) explains the way it works.

PRNG Test (Python)

2010-12-04T18:51:04-08:00

Python recipe 577484 by FB36 (math, mathematics, random). Revision 2.

This is a pseudo-random number generator test.

(There are many known tests for pseudo-random generators but I came up w/ this one on my own. I don't know if it is an already known method or not.)

Idea is this: Imagine if you generate a 1000-bit binary number using any PRNG (as 1-bit at a time) what is the probability that all bits will be 0 in the number?

If you had a true number generator then there is a real probability (=1/(2**1000)) but if you use a PRNG then I would say the probability is really 0!

If you had generated 2**1000 1000-bit numbers using a hypothetical True-Random Number Generator, assuming perfectly uniform probability distribution, then TRNG would generate 1 number that contains 1000 zeros. That is C(1000, 1000) = 1

Assuming perfectly uniform probability distribution, C(n,k) gives you how many n-digit binary numbers would contain k zeros.

This code generates 2**n n-bit binary numbers (one bit at a time) using the given PRNG and compares the actual distribution to the perfect distribution of a hypothetical True-Random Number Generator.

(I used n=20 in the code because the calculation takes too long.)

Maclaurin's_series_ln(1+x) (Python)

2010-07-07T12:28:36-07:00

Python recipe 577290 by Fouad Teniou .

C. Maclaurin. A Scottish mathematician gained his master degree at age 17, and his major mathematics' work arise from his special knowledge in Newton's ideas and the formulation of Newton's methods.

However, C. Maclaurin also contributed to the astronomy science and helped to improve maps and invented some mechanical devices.

My mathematics python's programs is a set of Maclaurin's series to compute some of the most important functions in calculus.

Though, the computation of an infinite sum which give the value of a function in terms of the derivatives evaluated at a special case where x0 = 0,in contrast with Taylor series.

The Maclaurin's series for ln(1+x) could be used to approximate the natural logarithm ln(x).

Numerical Inversion of the Laplace Transform using the Talbot method. (Python)

2009-10-27T04:53:30-07:00

Python recipe 576934 by Fernando Nieuwveldt (analysis, laplace, numerical). Revision 5.

This is a fast and highly accurate numerical method for the inversion of the Laplace transform

ZipScript: Build a directly executable zipped Python script set (Python)

2010-02-11T15:32:38-08:00

Python recipe 577042 by Glenn (package, script, zip). Revision 2.

This function will package a python script and additional python modules, in either source or compiled form. Either are directly executable by Python 2.7/3.1 or newer.

Uses make-like logic to only rebuild if something is newer than the previous build.

State Capitals Quiz (Python)

2009-05-28T07:45:06-07:00

Python recipe 576783 by joedaviscpa (dictionary, educational, random).

The program loops through all 50 states asking for the state capital.

scan db to login the ssh servers (Bash)

2010-03-16T13:11:17-07:00

Bash recipe 576877 by J Y (awk, bash). Revision 2.

awk with parameters passed from bash

Printing with Python and pyGTK (Python)

2009-06-25T13:54:34-07:00

Python recipe 576820 by Mark Muzenhardt (drawingarea, gtk, print, pygtk). Revision 2.

PyGTK is a very powerful GUI-Toolkit. Nearly everything is well documented, except how to print. I messed around for hours just to solve this problem so I decided to share this cool piece of code!

a list (C)

2009-05-20T18:19:52-07:00

C recipe 576772 by J Y (list).

what am i doing?

Dependency resolver (Python)

2008-11-23T07:43:01-08:00

Python recipe 576569 by Florian Mayer (dependecy, resolver). Revision 6.

Resolve dependencies of tasks.

Color Module (for Windows only) (Python)

2008-06-01T10:11:47-07:00

Python recipe 573439 by Drew Buckley .

This module makes it easy to set color schemes: preset and custom. Comes with 10 preset color schemes as well as an on-the-spot function to 'set' what ever scheme you want. Applies only to Windows CMD (Command Prompt)

N-way merge sort (Python)

2007-05-01T18:58:46-07:00

Python recipe 511509 by Mike Klaas (algorithms).

Merge sorted iterables with stability and built-in DSO

Firefox MOD (Python)

2007-03-28T14:45:50-07:00

Python recipe 511430 by Stephen Chappell (search).

This program fixes a file for Firefox for use on certain intranets and demonstrates automated file searching and editing. It was written for use at a university of several thousand computers.

Ping Technocrati with your blog URL (Python)

2006-10-31T07:42:07-08:00

Python recipe 498232 by Mayuresh Phadke (web). Revision 2.

Technocrati (http://www.technorati.com/) maintains a list of blogs tagged with user specified tags. People can submit their blogs for inclusion in Technocrati by using their RPC ping service at http://www.technorati.com/ping. This piece of code allows you ping Technocrati with blog details through a script.

Sized Dictionary (Python)

2006-07-02T06:22:29-07:00

Python recipe 496842 by James Kassemi (extending). Revision 2.

Good demonstration of inheriting python default object types. Define a maximum size (items, not bytes) to limit to and use as a normal dictionary (be careful to have KeyError exception handling, or use the dictionary's get method with a default value).

UrlAppServer (Python)

2006-02-27T13:25:24-08:00

Python recipe 474094 by Maciej Obarski (network).

Very simple way to interact with python via http.