title: Python - change text in string by random from a list
body: <p>I want to write a loop function that go through each letter in my list called original.</p>
  
  <pre><code>original = ['ABCD', 'DCBA', 'AAAA', 'AABB']
  letters  = ['A', 'B', 'C', 'D'] 
  
  p = 1
  
  for o in original: # loop through the original list
      for i in range(0,len(o)): # loop through each letter in selected list
  
          if random.randint(1,10) == p: #if this gives me the probability that is met
          # I want to change the current letter on the current index to 
          # something else different from the letter list by random (maybe random.choice)
  
  </code></pre>
  
  <p>Im new to python please can you advice.
  I dont want to use class or any other library but random please</p>