title: How to find a list of all **args of a function?
body: <p>How can I find a list of all <code>**args</code> of a function?</p>
  
  <p>For example, I know that <code>symbols()</code> take <code>positive=True</code>, <code>real=True</code>, etc. as arguments, and I would like to see a full list of these possible arguments.
  However, they're not listed in the Sympy Core <a href="http://docs.sympy.org/latest/modules/core.html#sympy.core.symbol.symbols" rel="nofollow noreferrer">doc page</a>.</p>
  
  <p>And I've dug through the source code itself, but I can't trace and locate what I'm looking for.</p>