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Your problem is that traitfile['words'] is a list, and when you copy it to tall_knight.words, you are copying a reference to the list, not the values in it. So when you modify the list in tall_knight, you also modify the value in traitfile['words']. You can work around this by making a copy of the value in the object using copy.copy (or copy.deepcopy if the values may be nested):

I wonder whether you have transcribed the original question accurately. Surely function get_knights_greeting is supposed to output its passed parameters. It can do so in several ways:

1. return 'I am %s of the Knights who say %s' % (name, answer)'
2. return 'I am {} of the Knights who say {}'.format(name, answer)
3. return 'I am {name} of the Knights who say {answer}'.format(answer=answer, name=name)
4. return f'I am {name} of the Knights who say {answer}' # Python 3 only

And then: