Popular recipes tagged "meta:loc=36"

The many uses of randomness - Part 1 (Python)

2016-06-01T19:36:28-07:00

Python recipe 580674 by Vasudev Ram (python, python2, random, random_number).

This recipe shows some of the many uses of random numbers, using the random function from the random module from Python's standard library. A subsequent recipe or two will show other uses, both of other functions from the module, and for other purposes.

The uses shown in this recipe have to do with using random float values, and scaling them and offsetting them, and also how to get a repeated/predictable series of random numbers.

Angosso (Perl)

2015-07-29T21:21:56-07:00

Perl recipe 579087 by Roger Mbiama Assogo (i18n).

PPM management utility for ActivePerl The http_proxy Environment Variable Setting http_proxy Using the CPAN shell

Spread sheet style column enumeration letter to number (Python)

2014-09-20T18:45:09-07:00

Python recipe 578941 by Tomas Nordin (conversion, excel, libreoffice, python, spreadsheet).

A post-it suggestion on how to convert "Excel style" notation of columns to a number.

Sticky window (Python)

2013-12-16T17:10:25-08:00

Python recipe 578789 by winand (windows).

Create a window which sticks to screen edges using PyQt4 under Windows.

Worley Noise Generator (Python)

2013-02-16T21:11:05-08:00

Python recipe 578459 by FB36 (fractal, graphics, math, mathematics).

Worley Noise is a type of parametric texture used for water, rock, leaf etc. textures in computer graphics.

The algorithm is a slightly modified version of Voronoi Diagram.

Use rot13 to en/decrypt clear text (Python)

2012-11-07T09:17:51-08:00

Python recipe 578322 by Eric.sun (encrypt, python3).

Encryption.Using your solution to the previous problem, and create a "rot13" translator. "rot13" is an old and fairly simplistic encryption routine where by each letter of the alphabet is rotated 13 characters. Letters in the first half of the alphabet will be rotated to the equivalent letter in the second half and vice versa, retaining case. For example, 'a' goes to 'n' and 'X' goes to 'K'. Obviously, numbers and symbols are immune from translation.

Promot & Verify Encrypted User Password (Python)

2013-01-19T04:10:13-08:00

Python recipe 578431 by Captain DeadBones (encryption, password, python).

This snippet of code was written as part of an article - Password Protecting You Python Application. The code requires a file with an encrypted password. The script to generate an encrypted file is Code To Store Encrypted Password in a File.

Genreate x digits prime number in python, version 1 (Python)

2013-01-06T20:25:20-08:00

Python recipe 578404 by Captain DeadBones (prime_generator, prime_number).

This is a prime number generator in python that I put together for an article I wrote How To Find Prime Numbers In Python. The script will generate a prime number of x digits for small numbers, less than 10.

Random Sound FX Using WAV File (Python)

2012-07-01T19:54:17-07:00

Python recipe 578180 by FB36 (audio, sound).

It generates random sound effects using AM and FM.

Pants (Python)

2012-07-03T05:31:24-07:00

Python recipe 578188 by Stephen Chappell (archive, old, programs, shell).

According to memory this is a port of a shell script called pants that allows one to "start," "stop," "restart," and find the "status" of one's pants (the program itself). I am not sure what the silliness is about but must have found the idea interesting to rewrite in Python. This is committed for archival to be run under Python 2.5 or later versions.

Rookie's Backup Program (Python)

2012-07-08T00:52:05-07:00

Python recipe 578199 by Stephen Chappell (archive, copy, old, utility).

A while back when still fairly new to Python, this simple program was developed to back directories of information. In reality, it is just a simple (and poorly written) file copier that could be greatly improved. This is committed for archival to be run under Python 2.5 or later versions.

Find a line of text in another file (Python)

2012-06-15T15:45:18-07:00

Python recipe 578164 by sami jan (line, search). Revision 2.

This is a simple recipe - it reads a line in file, removes the line-ending and attempts to search throughout another file for the same line, anywhere in the file

In case a line is missing, the line number is printed to stdout

ProgressBar class (Python)

2011-10-27T06:16:29-07:00

Python recipe 577926 by Petr Zizka (threads).

Progress bars are popular when trying to show how much of a job has been completed. In my case, it was encrypting and decrypting files. A GUI interface was written, but something was lacking. How was the user of the program supposed to know if the program was doing its job? A progress bar seemed like a good answer, so a simple GUI progress bar was written using Tkinter.

Decoding Binary Files (Python)

2011-03-15T00:11:10-07:00

Python recipe 577610 by Yony Kochinski (binary, decode, file, python). Revision 2.

One way to read files that contain binary fields is to use the struct module. However, to do this properly one must learn struct's format characters, which may look especially cryptic when sprinkled around the code. So instead, I use a wrapper object that presents a simple interface as well as type names that are more inline with many IDLs.

Method access counter proxy (Python)

2011-09-18T12:49:15-07:00

Python recipe 577869 by Yaşar Arabacı (proxy). Revision 4.

This function creates a proxy for a class so that you can count how many times each method called. It only works for mutable types.

Experiment with Kaprekar's routine (Python)

2011-06-12T03:29:01-07:00

Python recipe 577749 by Raymond Hettinger (6174, dot, graph, kaprekar). Revision 2.

Explore the story behind the mysterious number 6174. Generate all possible chains leading to 6174, show their length and their patterns of convergence.

Synchronized Chaos using Lorenz Attractor (Python)

2011-08-02T03:53:03-07:00

Python recipe 577816 by FB36 (chaos, fractal, math, mathematics).

2 chaotic Lorenz dynamical systems get synchronized with time. (Notice 2 y and 2 z values start differently but approach each other later.)

I used the x variable as the synchronization signal but y or z can also be used.

jpg2pdf (Python)

2011-07-17T19:49:58-07:00

Python recipe 577798 by Sundar Srinivasan (image, jpeg, pdf, reportlab).

Program to convert JPEG to PDF. Technically it just embeds the JPEG in a landscape US letter size PDF page. When you might need it?: When you have to scan a document and do not have scanner handy, you can take a photograph of the document with webcam, and embed the JPEG into PDF - effectively works as a scanner.

ActiveState recipe statistics (Python)

2011-06-02T14:52:50-07:00

Python recipe 577732 by Kaan Ozturk (html, regular_expressions, statistics, urllib2, web). Revision 2.

Downloads "All Recipe Authors" pages in ActiveState, uses regular expressions to parse author name and number of their recipes on each page. Finally, it displays the recipe submission distribution (the count of how many authors have submitted how many recipes each).

Composition of classes instead of multiple inheritance (Python)

2011-04-16T03:40:19-07:00

Python recipe 577658 by Ethan Furman (class_decorator, composition, inheritance, multiple_inheritance).

MI can be difficult and confusing, and if the base classes don't cooperate -- well, cooperative MI won't work.

One way around this is to use composition instead. This class decorator will combine the source classes with the target class, ensuring that no duplications occur (raises a TypeError if there are any).