title: I got formatting type error but I don't know why this happen
body: <pre><code>#35
  name1 = &quot;eric&quot;
  age1 = 10
  name2 = &quot;jay&quot;
  age2 = 13
  print('name:',name1,'age:','%d','\n'+'name:',name2,'age:','%d' % (age1,age2))
  </code></pre>
  <p>I got an error which is this:</p>
  <pre><code>TypeError: not all arguments converted during string formatting
  </code></pre>
  <p>May I ask you why this error happen?</p>