title: Python help command
body: <p>How can Python's help information on a given module/function be obtained?</p>
  <p>For example, to obtain information on scipy's chi2, the following commands:</p>
  <pre><code>&gt;&gt; from scipy.stats import chi2
  &gt;&gt; help(chi2.pdf)
  </code></pre>
  <p>provide only general help:</p>
  <blockquote>
  <p>Help on method pdf in module scipy.stats.distributions:</p>
  <p>pdf(self, x, *args, **kwds) method of scipy.stats.distributions.chi2_gen instance</p>
  <p>Probability density function at x of the given RV.</p>
  </blockquote>
  <p>etc.</p>
  <p>How can the specific details be obtained? In this example something like:</p>
  <blockquote>
  <p>The function call is chi2.pdf(x, v) with v degrees of freedom.</p>
  </blockquote>