title: How to use a for loop with input function
body: <p>I simply have to make a sum of three numbers and calculate the average</p>
  
  <pre><code>import sys
  sums=0.0
  k=3
  for w in range(k):
      sums = sums + input("Pleas input number " + str(w+1) + " ")
  print("the media is " + str(sums/k) + " and the Sum is " + str(sums))
  </code></pre>
  
  <p>And the error :</p>
  
  <pre><code>Pleas input number 1 1
  Traceback (most recent call last):
    File "/home/user/Python/sec001.py", line 5, in &lt;module&gt;
      sums = sums + input("Pleas input number " + str(w+1) + " ");
  TypeError: unsupported operand type(s) for +: 'float' and 'str'
  </code></pre>