Scrambled words
===============

Exercise
--------

.. interactive_code_block:: 
   :caption: Shuffle all letters except the first and last one of each word in a sentence
   
   from random import shuffle
   
   # Use a string to define which characters are punctuation marks
   punctuation_marks = '.:,;!?'
   
   def scramble(word):
   
       # Check if last item of that list is a punctuation mark
       has_puncuation_mark = word[-1] in punctuation_marks
   
       # Only scramble words consist have more than 3 characters
       if len(word) - has_puncuation_mark > 3:
   
           # Convert the string to list of strings
           characters = list(word)
   
           # Create a second list with the inner characters
           inner_characters = characters[1:-1 - has_puncuation_mark]
   
           # Check if inner_characters consists of different characters
           if len(set(inner_characters)) > 1:
   
               # Shuffle the list in place
               shuffle(inner_characters)
   
               # Replace the inner characters with the shuffled version
               characters[1:(-1 - has_puncuation_mark)] = inner_characters
   
               # Convert the list of strings to a string
               word = ''.join(characters)
   
       return word
   
   
   sentence = 'According to a researcher at Cambridge University, it doesn\\'t matter in what order the letters in a word are, the only important thing is that the first and last letter be at the right place.'
   words = sentence.split()
   
   scrambled_words = [scramble(word) for word in words]
   scrambled_sentence = ' '.join(scrambled_words)
   
   print(scrambled_sentence)
   
   """
   The Significance of Letter Position in Word Recognition
   PhD Thesis, 1976, Nottingham University, by Graham Rawlinson
   https://www.mrc-cbu.cam.ac.uk/people/matt.davis/cmabridge/rawlinson/
   
   Psycholinguistic "research" from the internet
   https://www.mrc-cbu.cam.ac.uk/people/matt.davis/cmabridge/
   """