Adding to the dictionary inside the for-loop - weird behaviour

[BashBedlam]

It's the line :

dict_words = dict.fromkeys(list1, [])

That's causing the trouble. I'm not sure how you would use the method fromkeys differently in order to correct the problem but if you replace that line with :

dict_words = {'!,': [], 'Hey!': []}

then your code will produce the expected results.