title: How to get text from Entry widget
body: <p>I've looked at several posts on stackOverflow that explain the answer but no matter which I use, I never can get the string from my entry widget; it just detects a string of ""</p>
  
  <p>here's my code:</p>
  
  <pre><code>def buttonTest():
      global score
      gui.title("Test")
      for child in gui.winfo_children():
          child.destroy()
      global questionText
      global questionAnswer
      questionText = StringVar()
      questionAnswer = 0    
      question = Label(gui, textvariable = questionText, fg = "black", bg = "white")
      question.grid(row = 0, column = 1)
      userInput = StringVar()
      input = Entry(gui, textvariable = userInput)
      input.grid(row = 1, column = 0)
  
  swapQuestion()
  
  checkAns = Button(text = "Check answer", command = partial(checkAnswer, userInput.get(), questionAnswer), fg = "black", width=10)
  checkAns.grid(row = 1, column = 2)
  </code></pre>