title: Python Str object is not callable in Spyder
body: <p>I have been trying to use str() function to convert the integer to string in Spyder (python 2.7). Every time I got <code>TypeError: 'str' object is not callable</code></p>
  
  <p>For example, I wrote this simple code to test it and I got the same error:</p>
  
  <pre><code>x = 5
  print str(x)
  </code></pre>
  
  <p>Can someone help me in this</p>