title: python numpy convert string to complex number
body: <p>I have a list of strings, each of which is a complex number. The format is as below:     </p>
  
  <pre><code>lr=['3.123+2.43i','0.23454-1.2134i','0.6543+0.76543i','1.12324+0.6543i']
  </code></pre>
  
  <p>What I want is a list of the modulus of each complex number.</p>