Dictionary of dictionaries in Python

Question

From another function  I have tuples like this   falseName    realName   positionOfMistake   eg    Milter    Miller   4   I need to write a function that make a dictionary like this   D  realName  falseName  positionOfMistake   falseName  positionOfMistake           realName  falseName  positionOfMistake            The function has to take a dictionary and a tuple like above  as arguments   I was thinking something like this for a start   def addToNameDictionary d  tup       dictionary        tup previousFunction string      for element in tup          if not dictionary has key element 1                dictionary append element 1       elif          if       But it is not working and I am kind of stucked here

User · Answer

dictionary s setdefault is a good way to update an existing dict entry if it s there  or create a new one if it s not all in one go   Looping style     This is our sample data data      Milter    Miller   4     Milter    Miler   4     Milter    Malter   2      dictionary we want for the result dictionary         loop that makes it work for realName  falseName  position in data      dictionary setdefault realName      falseName    position   dictionary now equals     Milter     Malter   2   Miler   4   Miller   4

User · Answer

If it is only to add a new tuple and you are sure that there are no collisions in the inner dictionary  you can do this  def addNameToDictionary d  tup       if tup 0  not in d          d tup 0            d tup 0   tup 1      tup 2

User · Answer

Using collections defaultdict is a big time-saver when you re building dicts and don t know beforehand which keys you re going to have   Here it s used twice  for the resulting dict  and for each of the values in the dict   import collections  def aggregate names errors       result   collections defaultdict lambda  collections defaultdict list       for real name  false name  location in errors          result real name  false name  append location      return result   Combining this with your code   dictionary   aggregate names previousFunction string     Or to test   EXAMPLES           Fred    Frad   123         Jim    Jam   100         Fred    Frod   200         Fred    Frad   300   print aggregate names EXAMPLES

[python] Dictionary of dictionaries in Python?

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