title: Python - strings and integers in Numpy array
body: <p>I want to create an array with 3 columns. The first one a string, the other two integers used for calculations. Then more rows will be added through the append function (below). </p>
  
  <p>The problem is that all columns seem to be coded as strings rather than just the first one. How do I get the correct data type for the numbers?</p>
  
  <pre><code>a = np.array([["String",1,2]])
  a = np.append(a, [["another string", 3, 4]],axis = 0)
  </code></pre>