Popular recipes tagged "meta:loc=28"

10 lines for a beginner to try out the Spyder IDE for python programming (Python)

2015-09-18T15:04:09-07:00

Python recipe 579100 by mai3a (error, snippet, spyder, stuffthatworks).

This python code generates no lint errors and just print out a few numbers.

Useful if you use the Spyder IDE for the first time, which provides NOTHING to get you started.

Quasicrystal Pattern Generator (Python)

2015-08-08T20:50:23-07:00

Python recipe 579094 by FB36 (fractal, graphics, image, images, math, mathematics).

Quasicrystal Pattern Generator

Get all installed Windows hotfixes (Perl)

2014-07-31T17:33:19-07:00

Perl recipe 578917 by Brett Carroll (engineering, fix, hotfix, hotfixes, ole, perl, quick, win32, windows, wmi).

This script uses WMI (via Win32::OLE) to retrieve and print out a comma separated list of all installed Windows hotfixes.

Guess the number, Game (Python)

2013-07-10T17:49:30-07:00

Python recipe 578600 by superducktoxic .

you think of the number and then guess it.

Prime Number Generator in Python (half effcient) (Python)

2013-01-06T20:20:49-08:00

Python recipe 578401 by Captain DeadBones (prime_generator, prime_number).

This is a simple prime number generator in python that I put together for an article I wrote How To Find Prime Numbers In Python. In this one we cut the numbers in half so it is only slightly more efficient than the simplest prime number generator.

Note: There are more efficient ways to do this. Please look at my other recipes.

Directory Cleaner (Python)

2012-12-05T20:56:05-08:00

Python recipe 578357 by Stephen Chappell (demonstration).

If there is a particular directory that you want purged of its files and want a solution in Python, this simple program is designed to do just that. This recipe is just meant as a starting point for those wondering how to delete all files and sub-folders from a central folder.

File Path Logger (Python)

2012-12-05T20:59:38-08:00

Python recipe 578358 by Stephen Chappell (demonstration).

If you want a list of directories and the files they contain, this program will log such information to a file for you. For those wondering how to walk directories and their contents, this little recipe provides an engine function that provides a simple demonstration of the os.walk function.

Sharing-aware tree transformations (Python)

2012-05-07T08:20:58-07:00

Python recipe 578117 by Sander Evers (fold, reduce, sharing, tree, yaml). Revision 2.

The function foldsh in this recipe is a general purpose tool for transforming tree-like recursive data structures while keeping track of shared subtrees.

# By default, a branch is encoded as a list of subtrees; each subtree can be a
# branch or a leaf (=anything non-iterable). Subtrees can be shared:
>>> subtree = [42,44]
>>> tree = [subtree,[subtree]]
# We can apply a function to all leaves:
>>> foldsh(tree, leaf= lambda x: x+1)
[[43, 45], [[43, 45]]]
# Or apply a function to the branches:
>>> foldsh(tree, branch= lambda t,c: list(reversed(c)))
[[[44, 42]], [44, 42]]
# The sharing is preserved:
>>> _[0][0] is _[1]
True
# Summing up the leaves without double counting of shared subtrees:
>>> foldsh(tree, branch= lambda t,c: sum(c), shared= lambda x: 0)
86

In particular, it is useful for transforming YAML documents. An example of this is given below.

Cycle-aware tree transformations (Python)

2012-06-20T08:09:13-07:00

Python recipe 578118 by Sander Evers (cyclic, fold, reduce, yaml).

A variation on Recipe 578117 that can deal with cycles. A cycle means that a tree has itself as a subtree somewhere. A fold over such a data structure has a chicken-and-egg-problem: it needs its own result in order to construct its own result. To solve this problem, we let branch construct a part of its result before going into recursion. After the recursion, branch gets a chance to complete its result using its children's results. Python's support for coroutines (using yield) provides a nice way to define such a two-stage branch function.

Random fractal curve (Python)

2011-07-09T22:09:23-07:00

Python recipe 577783 by FB36 (fractal, graphics, math, mathematics).

Random fractal curve (non-deterministic).

Linux cat command backward (Python)

2011-05-18T12:54:15-07:00

Python recipe 577699 by Andrey Nikishaev (cat, linux, log, output). Revision 2.

Utility to output file from backward. Useful for logs output.

webcheck: site to csv (Python)

2011-03-09T06:37:08-08:00

Python recipe 577602 by Jervis Whitley (html, linkcheck, sitemap, webcheck). Revision 3.

An extension to Arthur de Jong's excellent webcheck tool (a website link checker) (http://arthurdejong.org/webcheck) that will read in the resultant webcheck.dat file and create a csv formatted file.

Decorator to expose local variables of a function after execution [alternative implementation] (Python)

2010-07-08T09:44:28-07:00

Python recipe 577295 by Andrea Maffezzoli (decorator, function, inner, local, scope, variables). Revision 6.

Please note that the present is a fork of the recipe 577283 "Decorator to expose local variables of a function after execution" of Pietro Berkes, available at http://code.activestate.com/recipes/577283-decorator-to-expose-local-variables-of-a-function-/ , and aiming only to report the alternative implementation "persistent_locals2", whose I'm co-author with Pietro Berkes, and which was submitted together to the original recipe. Refer to the latter for an exhaustive description and discussion.

Total ordering class decorator (Python)

2010-09-07T05:47:25-07:00

Python recipe 576685 by Raymond Hettinger . Revision 11.

Given a class defining one or more ordering methods, this decorator supplies the rest. This simplifies and speeds-up the approach taken in recipe 576529.

REAL case insensitive string replace (Python)

2009-04-25T15:48:50-07:00

Python recipe 576715 by Jonas Haag (case, case_insensitive, replace, str). Revision 2.

REAL case insensitive version of str.replace that keeps the letter case of the original expression (Doesn't only replace Foo and foo to ...foo... but to ...Foo.. and ...foo...).

The Poem ( in Python) (Python)

2008-08-08T10:39:50-07:00

Python recipe 576413 by Marcello(Harry) Bontempo Salgueiro (in, poem, the).

This is my first poem writing in python. Why i do that? I do because i saw some perl poems and not so much in python, just it! =) Python developers let's go express your art, and domain of langague Python...!!!! ihulllllllllllllllll!!! see ya!

marcello.

Convenient Utility for Making Dictionaries (Python)

2008-07-23T23:55:00-07:00

Python recipe 576373 by Andrew Konstantaras (shortcuts).

This function creates a dictionary containing all of the variables passed as parameters with the variable name being the key and the value of the variable as the value. I use it frequently when passing parameters to another function.

sane tab completion in pdb (Python)

2009-07-06T04:35:33-07:00

Python recipe 498182 by Stephen Emslie (complete, debugging, pdb, tab). Revision 6.

I make frequent use of python's built-in debugger, but one obvious feature seems to be missing - the bash-like tab completion that you can add to the interpreter. Fortunately pdb's interactive prompt is an instance of Cmd, so we can write our own completion function.

Note: this uses rlcompleter, which isn't available on windows

Edit (6 Jul 2009): import rlcompleter early and force output to stdout to ensure monkeypatch sticks Edit: updated to handle changes in local scope Edit: Fixed start via 'python -m pdb ...'. Check the comments for details.

ISBN-13 converter (Python)

2006-09-15T18:53:01-07:00

Python recipe 498104 by Sanghyeon Seo .

ISBN, the International Standard Book Number, will migrate to 13-digits version from current 10-digits version on 2007-01-01. This recipe converts ISBN-10 to ISBN-13 by regenerating the check digit.

Keyed Dictionary -- strict key values in a dictionary (Python)

2006-12-04T21:52:58-08:00

Python recipe 499296 by Mike Hostetler (extending). Revision 2.

The KeyedDict object keeps a list of approved key values. If you try to assigned an unapproved key to a value, an exception is thrown.

When you create the object, you give it a sequence (tuple, list, etc.) of key objects and then, when you set an item with a key, it will make sure that the key is in the "approved" list. If you try to set an item with a key that isn't in your approved list, you get an TypeError exception.