title: Splitting string in Python starting from the first numeric character
body: <p>I need to manage string in Python in this way:</p>
  
  <p>I have this kind of strings with '>=', '=', '&lt;=', '&lt;', '>' in front of them, for example:</p>
  
  <pre><code>'&gt;=1_2_3'
  '&lt;2_3_2'
  </code></pre>
  
  <p>what I want to achieve is splitting the strings to obtain, respectively:</p>
  
  <pre><code>'&gt;=', '1_2_3' 
  '&lt;', '2_3_2'
  </code></pre>
  
  <p>basically I need to split them starting from the first numeric character.</p>
  
  <p>There's a way to achieve this result with regular expressions without iterating over the string checking if a character is a number or a '_'?</p>
  
  <p>thank you.</p>