title: check in while loop for only numbers in list
body: <p>I´m new to python and wanted to know how I can check with a while loop if the list contains only numbers ... else: print("sorry only numbers allowed")</p>
  
  <pre><code>numbers = [34, 39, 110, 303, 889, 223, 982, 7676]
  
  def getsSumVersionTwo(listOfStuff):
      sumNumbers = 0
      for x in listOfStuff:
          sumNumbers += x
          return sumNumbers
  print(getsSumVersionTwo(numbers))
  getsSumVersionTwo(numbers)
  </code></pre>