title: How to substring a string Python from a specific index in Python?
body: <p>what is the best way to substring a string in Python starting from a specific character ? </p>
  
  <p>For example, if <code>val = "s2*20"</code>, how to get the substring of <code>val</code> which is after <code>*</code>. The result should be <code>res = 20</code>. </p>
  
  <p>PS: We assume that all the strings contains <code>*</code> with different lengths. However, we don't know the exact index of <code>*</code>. </p>