Homework Session04
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Recommended Reading:
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  * Dive Into Python 3: Chapt. 2.7 (and 4 if you haven't already)

http://www.diveintopython3.net/native-datatypes.html#dictionaries

  * Dive Into Python 3: Chapt. 11

http://www.diveintopython3.net/files.html


Assignments:
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 * Finish the dict/sets lab: :ref:`exercise_dict_lab`
 * Finish the files lab: :ref:`exercise_file_lab`
 * Coding kata: trigrams: :ref:`exercise_trigrams`

 * update mailroom with dicts :ref:`exercise_mailroom_plus`