http://code.activestate.com/recipes/users/4192908/2015-09-29T16:56:16-07:00ActiveState Code Recipes2015-09-29T16:28:46-07:00webby1111http://code.activestate.com/recipes/users/4192908/http://code.activestate.com/recipes/579103-python-addset-attributes-to-list/

<p style="color: grey"> Python recipe 579103 by <a href="/recipes/users/4192908/">webby1111</a> (<a href="/recipes/tags/attributes/">attributes</a>, <a href="/recipes/tags/class/">class</a>, <a href="/recipes/tags/dictionary/">dictionary</a>, <a href="/recipes/tags/list/">list</a>, <a href="/recipes/tags/subclass/">subclass</a>). Revision 3. </p> <h4 id="python-attribute-listhttpsgithubcomwebby1111python-attribute-list"><a href="https://github.com/webby1111/Python-Attribute-List">Python Attribute List</a></h4> <p>Add/set attributes to python lists.</p> <p>A google search for "add attributes to python lists" yields no good stackoverflow answer, hence the need for this.</p> <p>Useful for machine learning stuff where you need labeled feature vectors. </p> <p>This technique can be easily adapted for other built-ins (e.g. int).</p> <h5 id="the-problem">The Problem</h5> <pre class="prettyprint"><code>a = [1, 2, 4, 8] a.x = "Hey!" # AttributeError: 'list' object has no attribute 'x' </code></pre> <h5 id="the-solution">The Solution</h5> <pre class="prettyprint"><code>a = L(1, 2, 4, 8) a.x = "Hey!" print a # [1, 2, 4, 8] print a.x # "Hey!" print len(a) # 4 # You can also do these: a = L( 1, 2, 4, 8 , x="Hey!" ) # [1, 2, 4, 8] a = L( 1, 2, 4, 8 )( x="Hey!" ) # [1, 2, 4, 8] a = L( [1, 2, 4, 8] , x="Hey!" ) # [1, 2, 4, 8] a = L( {1, 2, 4, 8} , x="Hey!" ) # [1, 2, 4, 8] a = L( [2 ** b for b in range(4)] , x="Hey!" ) # [1, 2, 4, 8] a = L( (2 ** b for b in range(4)) , x="Hey!" ) # [1, 2, 4, 8] a = L( 2 ** b for b in range(4) )( x="Hey!" ) # [1, 2, 4, 8] a = L( 2 ) # [2] </code></pre>

2015-09-29T16:56:16-07:00webby1111http://code.activestate.com/recipes/users/4192908/http://code.activestate.com/recipes/579104-simple-python-point-kd-tree-no-scipynumpy-needed/

<p style="color: grey"> Python recipe 579104 by <a href="/recipes/users/4192908/">webby1111</a> (<a href="/recipes/tags/geometry/">geometry</a>, <a href="/recipes/tags/kdtree/">kdtree</a>). </p> <p>A very simple and concise KD-tree for points in python.</p> <p>For labeled points, you may want to check out my other recipe: <a href="https://code.activestate.com/recipes/579103-python-addset-attributes-to-list/?in=user-4192908">Python add/set attributes to list</a></p>