title: Overflow encountered when evaluating string
body: <p>I got this error when I am trying to evaluate an expression f(x1, x2, ...) from a string based on given x1, x2, ...</p>
  <pre><code>I = eval(string)
  
  &lt;string&gt;:1: RuntimeWarning: overflow encountered in long_scalars
  </code></pre>
  <p>The string represent a very long expression (~ MBs in txt file) and contains huge numbers (&gt;int32), I am wondering how could I solve this? Is there any way to define the data type for the calculation involved in eval (I am guessing int64 probably work)?</p>
  <p>Thanks!</p>