Accessing value inside nested dictionaries

Question

I am new to python and need help in solving an issue   I have a dictionary like   tmpDict     ONE    TWO    THREE  10      Do we have any other way to access THREE s value other than doing   tmpDict  ONE    TWO    THREE

User · Answer

No  those are nested dictionaries  so that is the only real way  you could use get   but it s the same thing in essence   However  there is an alternative  Instead of having nested dictionaries  you can use a tuple as a key instead   tempDict      ONE    TWO    THREE    10  tempDict  ONE    TWO    THREE     This does have a disadvantage  there is no  easy and fast  way of getting all of the elements of  TWO  for example  but if that doesn t matter  this could be a good solution

User · Answer

My implementation   def get nested data   args       if args and data          element    args 0          if element              value   data get element              return value if len args     1 else get nested value   args 1      Example usage    gt  gt  gt  dct   foo    bar    one  1   two  2    misc   1 2 3     foo2  123   gt  gt  gt  get nested dct   foo    bar    one   1  gt  gt  gt  get nested dct   foo    bar    two   2  gt  gt  gt  get nested dct   foo    misc    1  2  3   gt  gt  gt  get nested dct   foo    missing    gt  gt  gt    There are no exceptions raised in case a key is missing  None value is returned in that case

User · Answer

You can use the get   on each dict  Make sure that you have added the None check for each access

User · Answer

The answer was given already by either Sivasubramaniam Arunachalam or ch3ka  I am just adding a performances view of the answer  dicttest    dicttest  ligne1     ligne1 1   test   ligne1 2   test8    timeit dicttest  ligne1    ligne1 1    timeit dicttest get  ligne1   get  ligne1 1    gives us    112 ns    29 7 ns per loop  mean    std  dev  of 7 runs  10000000 loops each  235 ns    9 82 ns per loop  mean    std  dev  of 7 runs  1000000 loops each

User · Answer

As always in python  there are of course several ways to do it  but there is one obvious way to do it   tmpdict  ONE    TWO    THREE   is the obvious way to do it   When that does not fit well with your algorithm  that may be a hint that your structure is not the best for the problem   If you just want to just save you repetative typing  you can of course alias a subset of the dict    gt  gt  gt  two dict   tmpdict  ONE    TWO     now you can just write two dict for tmpdict  ONE    TWO    gt  gt  gt  two dict  spam     23  gt  gt  gt  tmpdict   ONE     TWO     THREE   10   spam   23

[python] Accessing value inside nested dictionaries

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