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<div class="section" id="pylab-examples-example-code-set-and-get-py">
<span id="pylab-examples-set-and-get"></span><h1>pylab_examples example code: set_and_get.py<a class="headerlink" href="#pylab-examples-example-code-set-and-get-py" title="Permalink to this headline">ΒΆ</a></h1>
<p>(<a class="reference external" href="../../mpl_examples/pylab_examples/set_and_get.py">Source code</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/set_and_get.png">png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/set_and_get.hires.png">hires.png</a>, <a class="reference external" href="../../mpl_examples/pylab_examples/set_and_get.pdf">pdf</a>)</p>
<div class="figure">
<img alt="../../_images/set_and_get.png" src="../../_images/set_and_get.png" />
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<div class="highlight-python"><div class="highlight"><pre><span class="sd">"""</span>
<span class="sd">MATLAB and pylab allow you to use setp and get to set and get</span>
<span class="sd">object properties, as well as to do introspection on the object</span>
<span class="sd">set</span>
<span class="sd"> To set the linestyle of a line to be dashed, you can do</span>
<span class="sd"> >>> line, = plot([1,2,3])</span>
<span class="sd"> >>> setp(line, linestyle='--')</span>
<span class="sd"> If you want to know the valid types of arguments, you can provide the</span>
<span class="sd"> name of the property you want to set without a value</span>
<span class="sd"> >>> setp(line, 'linestyle')</span>
<span class="sd"> linestyle: [ '-' | '--' | '-.' | ':' | 'steps' | 'None' ]</span>
<span class="sd"> If you want to see all the properties that can be set, and their</span>
<span class="sd"> possible values, you can do</span>
<span class="sd"> >>> setp(line)</span>
<span class="sd"> set operates on a single instance or a list of instances. If you are</span>
<span class="sd"> in quey mode introspecting the possible values, only the first</span>
<span class="sd"> instance in the sequnce is used. When actually setting values, all</span>
<span class="sd"> the instances will be set. Eg, suppose you have a list of two lines,</span>
<span class="sd"> the following will make both lines thicker and red</span>
<span class="sd"> >>> x = arange(0,1.0,0.01)</span>
<span class="sd"> >>> y1 = sin(2*pi*x)</span>
<span class="sd"> >>> y2 = sin(4*pi*x)</span>
<span class="sd"> >>> lines = plot(x, y1, x, y2)</span>
<span class="sd"> >>> setp(lines, linewidth=2, color='r')</span>
<span class="sd">get:</span>
<span class="sd"> get returns the value of a given attribute. You can use get to query</span>
<span class="sd"> the value of a single attribute</span>
<span class="sd"> >>> getp(line, 'linewidth')</span>
<span class="sd"> 0.5</span>
<span class="sd"> or all the attribute/value pairs</span>
<span class="sd"> >>> getp(line)</span>
<span class="sd"> aa = True</span>
<span class="sd"> alpha = 1.0</span>
<span class="sd"> antialiased = True</span>
<span class="sd"> c = b</span>
<span class="sd"> clip_on = True</span>
<span class="sd"> color = b</span>
<span class="sd"> ... long listing skipped ...</span>
<span class="sd">Alisases:</span>
<span class="sd"> To reduce keystrokes in interactive mode, a number of properties</span>
<span class="sd"> have short aliases, eg 'lw' for 'linewidth' and 'mec' for</span>
<span class="sd"> 'markeredgecolor'. When calling set or get in introspection mode,</span>
<span class="sd"> these properties will be listed as 'fullname or aliasname', as in</span>
<span class="sd">"""</span>
<span class="kn">from</span> <span class="nn">pylab</span> <span class="kn">import</span> <span class="o">*</span>
<span class="n">x</span> <span class="o">=</span> <span class="n">arange</span><span class="p">(</span><span class="mi">0</span><span class="p">,</span><span class="mf">1.0</span><span class="p">,</span><span class="mf">0.01</span><span class="p">)</span>
<span class="n">y1</span> <span class="o">=</span> <span class="n">sin</span><span class="p">(</span><span class="mi">2</span><span class="o">*</span><span class="n">pi</span><span class="o">*</span><span class="n">x</span><span class="p">)</span>
<span class="n">y2</span> <span class="o">=</span> <span class="n">sin</span><span class="p">(</span><span class="mi">4</span><span class="o">*</span><span class="n">pi</span><span class="o">*</span><span class="n">x</span><span class="p">)</span>
<span class="n">lines</span> <span class="o">=</span> <span class="n">plot</span><span class="p">(</span><span class="n">x</span><span class="p">,</span> <span class="n">y1</span><span class="p">,</span> <span class="n">x</span><span class="p">,</span> <span class="n">y2</span><span class="p">)</span>
<span class="n">l1</span><span class="p">,</span> <span class="n">l2</span> <span class="o">=</span> <span class="n">lines</span>
<span class="n">setp</span><span class="p">(</span><span class="n">lines</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s">'--'</span><span class="p">)</span> <span class="c"># set both to dashed</span>
<span class="n">setp</span><span class="p">(</span><span class="n">l1</span><span class="p">,</span> <span class="n">linewidth</span><span class="o">=</span><span class="mi">2</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'r'</span><span class="p">)</span> <span class="c"># line1 is thick and red</span>
<span class="n">setp</span><span class="p">(</span><span class="n">l2</span><span class="p">,</span> <span class="n">linewidth</span><span class="o">=</span><span class="mi">1</span><span class="p">,</span> <span class="n">color</span><span class="o">=</span><span class="s">'g'</span><span class="p">)</span> <span class="c"># line2 is thicker and green</span>
<span class="k">print</span> <span class="s">'Line setters'</span>
<span class="n">setp</span><span class="p">(</span><span class="n">l1</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'Line getters'</span>
<span class="n">getp</span><span class="p">(</span><span class="n">l1</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'Rectangle setters'</span>
<span class="n">setp</span><span class="p">(</span><span class="n">gca</span><span class="p">()</span><span class="o">.</span><span class="n">patch</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'Rectangle getters'</span>
<span class="n">getp</span><span class="p">(</span><span class="n">gca</span><span class="p">()</span><span class="o">.</span><span class="n">patch</span><span class="p">)</span>
<span class="n">t</span> <span class="o">=</span> <span class="n">title</span><span class="p">(</span><span class="s">'Hi mom'</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'Text setters'</span>
<span class="n">setp</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="k">print</span> <span class="s">'Text getters'</span>
<span class="n">getp</span><span class="p">(</span><span class="n">t</span><span class="p">)</span>
<span class="n">show</span><span class="p">()</span>
</pre></div>
</div>
<p>Keywords: python, matplotlib, pylab, example, codex (see <a class="reference internal" href="../../faq/howto_faq.html#how-to-search-examples"><em>Search examples</em></a>)</p>
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