Popular recipes tagged "generator" but not "macbook_pro"

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')))

DEMO - Generate A Crude 1KHz Sinewave Using A BASH Script. (Bash)

2013-03-01T19:41:47-08:00

Bash recipe 578477 by Barry Walker (audio, bash, demo, generator, linux, shell, sinewave, sound).

A very simple crude sinewave generator using a BASH script inside a Linux Terminal.

The file required is generated inside the code and requires /dev/audio to work.

Ensure you have this device, if not the download oss-compat from your OS's repository...

It lasts for about 8 seconds before exiting and saves a 65536 byte file to your working directory/drawer/folder as sinewave.raw.

Use an oscilloscope to check the waveform generated...

It is entirely Public Domain and you may do with it as you please...

Enjoy finding simple solutions to often very difficult problems... ;o)

Bazza, G0LCU...

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.

Forwards Compatibility; Generating A Function On The Fly... (Python)

2012-06-06T17:16:27-07:00

Python recipe 578160 by Barry Walker (amiga, demo, e_uae, function, generator, linux, windows, winuae).

This code auto-generates a function that converts a string to bytes only in Python Versions 3.x.x. The function will NOT be generated in Python Versions 1.4.0 to 2.7.x. See the code for all the versions tested on. Inside the code are commented-out lines to show a practical usage for this and WILL be used in future /dev/audio or /dev/dsp access that I may develop...

See the notes right at the bottom and read all the notes inside the code...

This is NOT Public Domain like all my other stuff but is MIT licenced...

Enjoy finding simple solutions to often very difficult problems...

Bazza, G0LCU...

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.

Simple Morse Code Generator And Tutor. (Python)

2012-01-09T22:51:12-08:00

Python recipe 578009 by Barry Walker (audio, code, demo, generator, linux, morse, morse_code, sound). Revision 2.

This is not for the big guns, but for the Amateur coder AND radio enthusiast.

It is a DEMO Morse Code Generator and tutor that will generate the tones required for the original standard letters A to Z and numbers 0 to 9. Puctuation is NOT included but hey it is SOOOO simple to modify the code that I will let you, (the ones interested), do that for yourselves... ;o) Read the code for more informaton.

It is for at least standard text mode Python 2.5.2 to 2.7.2 using PCLinuxOS 2009 and Debian 6.0.0. It may well work at a much earlier version. I do have a version for Python 3.x.x but that will be uploaded elsewhere.

As it stands it _sends_ at around 8 WPM, (Words Per Minute).

It is written in such a way that youngsters can understand what is going on.

Enjoy finding simple solutions to often very difficult problems... ;o)

Bazza, G0LCU...