title: AttributeError: 'module' object has no attribute 'Tk'
body: <p>I started to learn GUI developement using the Tkinter python library but I faced a problem with the PyCharm IDE community edition 4.5.2</p>
  
  <p>My problem is: when I write the code below in the IDLE, it works fine!!!
  but when I write it using the the PyCharm IDE, this error message appears:
  AttributeError: 'module' object has no attribute 'Tk' 
  Please help me, I really need help and thank you a lot</p>
  
  <p>My code:</p>
  
  <pre><code>import Tkinter
  
  app = Tkinter.Tk()
  app.title("hello world")
  app.minsize(300, 300)
  helloLabel = Tkinter.Label(app, text="hello GUI")
  helloLabel.pack()
  
  app.mainloop()
  </code></pre>
  
  <p>Note: I'm using Python 2.7.6, OS: Ubuntu 14.04 LTS</p>