Popular recipes tagged "generator" but not "linux"

Pluggable Python generators (Python)

2016-03-18T19:11:48-07:00

Python recipe 580628 by Vasudev Ram (generator, generators, python).

This is a simple recipe to show that Python generators are pluggable, i.e., they can be passed as arguments into functions, and then used inside those functions.

Python Short URL Generator (Python)

2014-11-09T11:19:07-08:00

Python recipe 578961 by Des Wagner (deterministic, generator, short, tiny, unique, url).

Python implementation for generating Tiny URL- and bit.ly-like URLs.

Random Password Generation (Python)

2014-08-10T15:50:40-07:00

Python recipe 578920 by Paul Wolf (generator, password, python, random, string, strong).

Generate a password (or other secure token) using a pattern language similar to regular expressions. We'll use the strgen module that enables a user to generate test data, unique ids, passwords, vouchers or other randomized data very quickly using a template language. The template language is superficially similar to regular expressions but instead of defining how to match or capture strings, it defines how to generate randomized strings.

Cycling a sequence (Python)

2014-09-20T19:20:46-07:00

Python recipe 578942 by Tomas Nordin (cyclic_iterator, generator, iterable, iterator, python).

A post-it function to cycle through some sequence. Better use itertools.cycle if for any iterable.

create a unique session key (Python)

2014-07-03T16:32:53-07:00

Python recipe 578903 by john stinson (generator, sessions).

A simple function that will generate a secure and unique session key.

grep in Python (Python)

2014-03-05T19:47:50-08:00

Python recipe 578845 by Andy Dustman (generator, grep, search).

The grep() function is inspired by UNIX grep, but is not limited to string patterns and files or streams.

And yet another round-robin generator (Python)

2013-11-13T19:30:29-08:00

Python recipe 578768 by Jan Müller (generator, itertools, python, roundrobin).

I know that there is a nice recipe already that even made it into the Python documentation, but this one is more concise and at the same time simpler.

>>> list(roundrobin('ABC', 'D', 'EF'))
['A', 'D', 'E', 'B', 'F', 'C']

Generator with lookahead (Python)

2013-09-24T10:44:56-07:00

Python recipe 578671 by Rutger Saalmink (background, generator, generators, lookahead, performance, python).

Python generators are a great way of reducing memory usage due to the lazy (on demand) generation of values. However, when the process-time of generating such a value is relatively high, we can improve performance even more by obtaining the next n values of the generator in a separate thread in the background. Hence, the BackgroundGenerator.

Python Short URL Generator (Python)

2011-09-19T14:06:36-07:00

Python recipe 576918 by Michael Fogleman (deterministic, generator, short, tiny, unique, url). Revision 3.

Python implementation for generating Tiny URL- and bit.ly-like URLs.

Retry loop (Python)

2013-05-23T20:45:01-07:00

Python recipe 578527 by Ryan Nowakowski (exception, generator, loop, retry, timeout).

Encapsulates the logic of a retry loop using a generator function.

A SOX 1KHz Sinewave Generator Using A Windows, (TM), Batch File... (Batch)

2013-05-02T17:48:18-07:00

Batch recipe 578516 by Barry Walker (audio, generator, sound, sound_exchange, sox, windows).

32 bit Windows to Windows 7...

This batch file generates a 65536 byte binary file to give 8 seconds of pure sinewave at the earphone/speaker output(s)...

It uses ONLY a default Windows 32 bit installation, to Windows 7, except for the installation of SOX...

Obtain SOX from here:-

http://sox.sourceforge.net/

Notepad was the _main_ editor... ;o)

Hopefully the code section does NOT corrupt the binary part which is 8 bytes in size. If it does then let me know on here and I will post a pointer from where to grab it...

Enjoy...

Password Generator (mkpasswd) (Python)

2013-07-31T23:23:02-07:00

Python recipe 578468 by James Mills (generator, mkpasswd, password, secure). Revision 3.

Since everyone is posting one of these, I thought I'd post mine. I wrote this many years ago and use it everywhere.

Wrap any iterable context manager so it closes when consumed (Python)

2012-11-19T20:10:35-08:00

Python recipe 578342 by Andrew Barnert (contextmanager, context_manager, generator, iterable, iterator, with_statement).

There are a few types in Python—most notably, files—that are both iterators and context managers. For trivial cases, these features are easy to use together, but as soon as you need to use the iterator lazily or asynchronously, a with statement won't help. That's where this recipe comes in handy:

send_async(with_iter(open(path, 'r')))

This also allows you to "forward" closing for a wrapped iterator, so closing the outer iterator also closes the inner one:

sync_async(line.upper() for line in with_iter(open(path, 'r')))

Retry loop (Python)

2013-05-24T05:19:50-07:00

Python recipe 578163 by Oren Tirosh (exception, generator, loop, retry, timeout). Revision 4.

Encapsulates the logic of a retry loop using a generator function.

Recursively defined, Haskell-style infinite lists (Python)

2012-05-04T14:09:14-07:00

Python recipe 578119 by John Crichton (decorator, functional, generator, infinite, itertools, lazy, recursive). Revision 2.

A decorator to simplify the creation of recursively defined, Haskell-style infinite lists -- ie. recursive generators -- inspired by Raymond Hettinger's "Technique for cyclical iteration" [*].

[*] http://code.activestate.com/recipes/576961-technique-for-cyclical-iteration/

Random user generator (Python)

2012-02-27T16:58:33-08:00

Python recipe 578055 by Koppula Varun Raj (generator, pickle, python3, random).

I've worked on a random user generator in C a long time ago, so I thought I'd make an advanced version of it in Python(3.2). I'll have you know, I am an amateur in Python and even programming for that matter so I'd really appreciate some criticism on my code and what more can be added.

About the program - I've added a default list of users, you can modify the list to your convenience and for data persistence, I made use of the pickle module. The random module plays the pivotal role generating the output making use of the choice method. Those along with the os module if the program is being run for the first time on a pc, it will create a data file with the default list.After some digging around, I managed to find os.getlogin() from the python library which was exactly what I was looking for (to get the computer's name making sure it can get the data file to the correct directory). I'm a little skeptical about that part, wondering whether or not it will work on every pc.

Password Card Generator (Python)

2012-01-26T02:37:30-08:00

Python recipe 578027 by userend (card, create, generator, passwd, password, python, secret).

This project was inspired by the passwordcard.org website. I wanted to see if I could do the same thing using Python. Select a password using this convenient card that you carry with you.

Left-handed password generator (Python)

2011-10-31T12:51:14-07:00

Python recipe 577930 by Alex (generator, lefthand, lefthanded, password, passwords). Revision 2.

Generate passwords that can easily be typed with only the left hand, very simple script

Run async code inline, nonblocking (Python)

2011-11-23T10:13:31-08:00

Python recipe 577959 by PRITAM K (asynchronous, closure, decorator, generator, threads).

A decorator, that makes it easy to switch between the mainthread and background threads.

Password Generator (Short Code) (Python)

2011-11-18T03:02:13-08:00

Python recipe 577949 by Alexander James Wallar (alphabet, generator, lambda, password, passwords, password_generator, python, secure, security, short_code). Revision 2.

This recipe generates a pseudo-random password of a prescribed length. It also lets you specify what characters are not permitted in the password or specify what characters are.