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03/05/10 23:11:34 (6 months ago)
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hodgestar
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Dictionaries and sets.

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  • hodgestar/Talks/PythonForProgrammers/html/py4progs-7.html

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    77<body> 
    88<div style='margin: auto; width: 50%;'><h2>Dictionaries and Sets</h2><ul> 
    9 <li>Dictionaries</li> 
     9<li>Dictionaries:<div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">a</span> <span class="o">=</span> <span class="p">{</span> <span class="mf">1</span><span class="p">:</span> <span class="s">&#39;a&#39;</span><span class="p">,</span> <span class="mf">2</span><span class="p">:</span> <span class="mf">4</span><span class="p">,</span> <span class="mf">3</span><span class="p">:</span> <span class="bp">None</span><span class="p">,</span> <span class="mf">5</span><span class="p">:</span> <span class="n">textutil</span><span class="p">,</span> <span class="p">(</span><span class="mf">1</span><span class="p">,</span> <span class="mf">2</span><span class="p">,</span> <span class="mf">3</span><span class="p">):</span> <span class="p">[]</span> <span class="p">}</span> 
     10<span class="gp">&gt;&gt;&gt; </span><span class="n">a</span><span class="p">[</span><span class="mf">3</span><span class="p">]</span> 
     11<span class="gp">&gt;&gt;&gt; </span><span class="n">b</span> <span class="o">=</span> <span class="n">a</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span> 
     12<span class="gp">&gt;&gt;&gt; </span><span class="n">b</span><span class="p">[</span><span class="mf">5</span><span class="p">]</span> 
     13<span class="go">&lt;module &#39;textutil&#39; from &#39;textutil/__init__.pyc&#39;&gt;</span> 
     14<span class="gp">&gt;&gt;&gt; </span><span class="k">del</span> <span class="n">b</span><span class="p">[</span><span class="mf">5</span><span class="p">]</span> 
     15</pre></div> 
     16</li> 
    1017 
    11 <li>Sets</li> 
     18<li>Sets:<div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="n">set</span><span class="p">(</span><span class="s">&quot;elephant&quot;</span><span class="p">)</span> 
     19<span class="go">set([&#39;a&#39;, &#39;e&#39;, &#39;h&#39;, &#39;l&#39;, &#39;n&#39;, &#39;p&#39;, &#39;t&#39;])</span> 
     20</pre></div> 
     21</li> 
     22 
     23<li>Python 3 has dict-like set syntax: { 1, 2, 3 }</li> 
    1224</ul> 
    1325</div><br /><div class="footer"><hr /><div style="float: left; font-style: italic;">Python 4 Programmers</div><div style="float: right;"><a accesskey="P" href="py4progs-6.html">Prev</a> | <a accesskey="I" href="py4progs-0.html">Index</a> | Next</div></div></body></html>