title: Evaluating sympy equation as decimal (inside sympy)
body: <p>I have a sympy equation that gives me:</p>
  
  <pre><code>&gt;&gt;&gt; ans0=solve([c_eq1, c_eq2, v_eq1, v_eq2, v_eq3],[a, b, c, d, e])
  &gt;&gt;&gt; ans0
  {a: 9/796, b: 27/3980, c: 9/1990, d: 5/796, e: 1/199}
  </code></pre>
  
  <p>Is there a way to get this answer in decimal without converting it to a float (outside sympy), for example with:</p>
  
  <pre><code>dict((var,float(value)) for var, value in ans0.items())
  {a: 0.011306532663316583, b: 0.0067839195979899495, c: 0.004522613065326633, d: 0.00628140703517588, e: 0.005025125628140704}
  </code></pre>