http://code.activestate.com/recipes/langs/python/tags/selection/2011-06-14T17:46:41-07:00ActiveState Code Recipes2011-06-14T17:46:41-07:00Patrick Dobbshttp://code.activestate.com/recipes/users/4177984/http://code.activestate.com/recipes/577754-pick-random-elements-from-a-predefined-list-of-cho/

<p style="color: grey"> Python recipe 577754 by <a href="/recipes/users/4177984/">Patrick Dobbs</a> (<a href="/recipes/tags/choice/">choice</a>, <a href="/recipes/tags/random/">random</a>, <a href="/recipes/tags/selection/">selection</a>). </p> <p>This (quick but strangely satisfying) recipe combines the use of random.choice with functools.partial from the standard library. It is a factory function returning random.choice pre-filled with its sequence of options.</p>

2010-10-01T02:17:50-07:00Sunjay Varmahttp://code.activestate.com/recipes/users/4174115/http://code.activestate.com/recipes/577409-python-tkinter-canvas-rectangle-selection-box/

<p style="color: grey"> Python recipe 577409 by <a href="/recipes/users/4174115/">Sunjay Varma</a> (<a href="/recipes/tags/canvas/">canvas</a>, <a href="/recipes/tags/rectangle/">rectangle</a>, <a href="/recipes/tags/selection/">selection</a>, <a href="/recipes/tags/tkinter/">tkinter</a>). </p> <p>A simple, yet effective rectangle selection box. :)</p> <p>Works with a tkinter canvas! Just add the class and set it up like in the example code. The cross heir was my own touch, the RectTracker only draws a box.</p> <p>Have fun! And please don't just vote down, post what you don't like if you don't like it.</p>

2010-11-30T07:32:42-08:00Teodor Kichatovhttp://code.activestate.com/recipes/users/4176095/http://code.activestate.com/recipes/577477-select-some-nth-smallest-elements-quickselect-inpl/

<p style="color: grey"> Python recipe 577477 by <a href="/recipes/users/4176095/">Teodor Kichatov</a> (<a href="/recipes/tags/quickselect/">quickselect</a>, <a href="/recipes/tags/search/">search</a>, <a href="/recipes/tags/selection/">selection</a>). </p> <p>fork of <a href="http://code.activestate.com/recipes/269554-select-the-nth-smallest-element/" rel="nofollow">http://code.activestate.com/recipes/269554-select-the-nth-smallest-element/</a> O(n) quicksort style algorithm for looking up data based on rank order. Useful for finding medians, percentiles, quartiles, and deciles. Equivalent to [data[n] for n in positions] when the data is already sorted.</p>

2010-11-30T17:38:38-08:00Teodor Kichatovhttp://code.activestate.com/recipes/users/4176095/http://code.activestate.com/recipes/577478-search-nth-smallest-element-in-really-big-file/

<p style="color: grey"> Python recipe 577478 by <a href="/recipes/users/4176095/">Teodor Kichatov</a> (<a href="/recipes/tags/big/">big</a>, <a href="/recipes/tags/file/">file</a>, <a href="/recipes/tags/kth/">kth</a>, <a href="/recipes/tags/python/">python</a>, <a href="/recipes/tags/search/">search</a>, <a href="/recipes/tags/selection/">selection</a>, <a href="/recipes/tags/smallest/">smallest</a>). </p> <p>Search nth smallest float in really big file (more, more and more bigger than available RAM) in a single pass through the file</p> <p>if your file more than 150GB - you should use a more appropriate sampling params to the data more - you can use tempfile to store data(interval) returned from func fill_interval data: file with only one float number per line, good shuffled</p>

2009-09-29T13:34:35-07:00pavelhttp://code.activestate.com/recipes/users/4171837/http://code.activestate.com/recipes/576917-functional-selection-sort/

<p style="color: grey"> Python recipe 576917 by <a href="/recipes/users/4171837/">pavel</a> (<a href="/recipes/tags/algorithm/">algorithm</a>, <a href="/recipes/tags/algorithms/">algorithms</a>, <a href="/recipes/tags/functional/">functional</a>, <a href="/recipes/tags/lambda/">lambda</a>, <a href="/recipes/tags/reduce/">reduce</a>, <a href="/recipes/tags/selection/">selection</a>, <a href="/recipes/tags/sort/">sort</a>, <a href="/recipes/tags/sorting/">sorting</a>). Revision 3. </p> <p>This is a variant of selection sort without using for-statements. Do you like it? :-)</p>