Popular recipes tagged "meta:loc=10"

Get disk partition information with psutil (cross-platform) (Python)

2016-12-23T18:05:41-08:00

Python recipe 580737 by Vasudev Ram (device, disk, file_system, psutil, python, sysadmin, system).

This is a recipe that shows how to easily get disk partition information, in a cross-platform manner (for the supported OSes), from your computer's operating system, using the psutil library for Python.

Count lines and words in a text file (Batch)

2017-04-28T08:22:08-07:00

Batch recipe 580791 by Antoni Gual (word_count). Revision 2.

Returns number of lines and words (separed by spaces) of a text file dragged to the script. Does'nt count blank lines.

Validate product (Python)

2014-10-05T19:17:56-07:00

Python recipe 578947 by Savu Andreea .

Necessary in commerce

Python DBAPI 2 "qmark" to "named" paramstyle (Python)

2012-12-14T19:39:04-08:00

Python recipe 578380 by Steve Howe (dbapi, named, paramstyle, python, qmark, sqlite, sqlite3).

Allows to use "named"-style params with drivers that support only "qmark"-style, as sqlite3.

Loaded assemblies (Ruby)

2012-11-19T08:53:23-08:00

Ruby recipe 578341 by greg zakharov (assemblies, ironruby).

Sometimes (working with IronRuby with interactive mode) it's very useful to know what assemblies was loaded. This sample shows how to do it.

How to Mutate a Float (Python)

2012-05-14T16:49:13-07:00

Python recipe 578132 by Stephen Chappell (ctypes, experiment, float, structure).

This is just an experiment to test my mental understanding of Python. It should not be used in any code as is violates the design principle that floats are to be immutable. The code also abuses ctypes and an understanding of how floats are currently arranged in memory. set_float is not guaranteed to work properly on any system, and may fail to work in the future if the data's arrangement changes.

Context manager to prevent calling code from catching exceptions (Python)

2012-06-17T09:20:56-07:00

Python recipe 577863 by Oren Tirosh (context_manager, exception).

The following context manager causes any exceptions raised inside it to print a stack trace and exit immediately. The calling scope is not given a chance to catch the exception.

Teach the hashbang header new tricks using a dual mode shell/python script (Python)

2011-08-21T07:27:05-07:00

Python recipe 577851 by Oren Tirosh (hashbang, interpreter, options, python, sh, shell).

This dual-mode script is both a Posix shell script and a python script. The shell part looks like a triple-quoted string to the Python interpreter. The shell does not reach anything after the exec statement.

Calculate Trailing Zeroes in a Factorial (Python)

2011-08-15T17:23:03-07:00

Python recipe 577844 by Stijn de Graaf (calculate, calculation, factorial, trailing, zero, zeroes).

Calculates the number of trailing zeroes on the end of x! when the user inputs x.

Pickle to/from socket (Python)

2011-04-19T22:22:53-07:00

Python recipe 577667 by pavel (pickle, socket). Revision 2.

It's useful for transfering objects through socket, when doing communication between processes or networking.

C# Surface Normal (Java)

2010-08-06T21:00:07-07:00

Java recipe 577348 by John Hurliman (csharp, graphics, normal).

Calculates a surface normal given three position vectors in clockwise order. Written in C#

Improved range function (Python)

2010-06-07T01:50:20-07:00

Python recipe 577256 by Sunjay Varma (float, python, range, replace). Revision 2.

While using the built-in range function a while ago. I found an odd (perhaps bug) where the range function couldn't use float steps. I am not sure if that was intended for simplicity or not, but I wrote my own range function that goes beyond that anyway.

query (Python)

2010-03-09T18:34:05-08:00

Python recipe 577099 by Trent Mick (ask, cli, query, raw_input).

Ask/prompt the user for a short piece of data. Recipe 577098 is a much more generic/functional (but longer) take on this.

Depth first search generator (Python)

2009-11-09T04:46:21-08:00

Python recipe 576946 by Paul W. Miller (algorithms, graphs). Revision 7.

This is the standard iterative DFS code modified to yield the vertices visited, so you don't have to pass a function into the DFS routine to process them. Note that this code is not quite complete... you'll need to define the function neighbors (v) based on your graph representation.

Flattened List (Python)

2009-04-27T18:41:21-07:00

Python recipe 576719 by marlonamor (flat, generator, itertools, list, nested). Revision 2.

This flattenizes any nested level list. I couln't find this in itertools module so I wrote it. Python 3 may be required.

Unique lines from a text file, case sensitive or insensitive (Python)

2009-04-05T19:58:50-07:00

Python recipe 576713 by nick (uniq, unique_lines).

Spits out sorted, deduplicated lines.

Generating correlated random numbers (Python)

2008-09-21T21:21:52-07:00

Python recipe 576512 by Kaushik Ghose (matplotlib, random_number).

From this great tutorial

For two corelated variables, the formula is much as one would get from intuition about the meaning of correlation with some twist due to normalizing the standard deviation: $X_3 = \alpha X_1 + \sqrt{1-\alpha^2} X_2$ Where $X_1$ and $X_2$ are two independent random variables, and $\alpha$ is the coefficient of correlation between $X_1$ and $X_3$.

In a more general sense:
Let $C$ be the correlation matrix desired. Let $X_1, X_2..., X_N$ be $N$ independent random variables arranged in a row matrix $R = [X_1, X_2,....,X_N]$. Then $Q = RU$ where $U^TU = C$ gives us $N$ random variables $Q = [Y_1, Y_2, ..., Y_N]$ with the required property.

Case-insensitive string replacement (Python)

2008-03-26T22:07:55-07:00

Python recipe 552726 by Christopher Neugebauer (text). Revision 2.

Python does not have case-insensitive string replacement built into the default string class. This class provides a method that allows you to do this.

Using PyXPCOM to handle IDN (Python)

2006-12-22T20:49:12-08:00

Python recipe 499340 by Sanghyeon Seo .

PyXPCOM gives Python access to Mozilla's XPCOM, cross-platform component object model.

This recipe demonstrates using PyXPCOM to access Mozilla's IDN service.

Count PDF pages (Python)

2013-07-11T06:15:27-07:00

Python recipe 496837 by Dirk Holtwick (files).

A simple way to count the pages of a PDF the pure Python way.