sort dict by value python

Question

Assume that I have a dict   data    1  b   2  a     And I want to sort data by  b  and  a  so I get the result   a   b    How do I do that  Any ideas

User · Answer

If you actually want to sort the dictionary instead of just obtaining a sorted list use collections OrderedDict   gt  gt  gt  from collections import OrderedDict  gt  gt  gt  from operator import itemgetter  gt  gt  gt  data    1   b   2   a    gt  gt  gt  d   OrderedDict sorted data items    key itemgetter 1     gt  gt  gt  d OrderedDict   2   a     1   b      gt  gt  gt  d values     a    b

User · Answer

I also think it is important to note that Python dict object type is a hash table  more on this here   and thus is not capable of being sorted without converting its keys values to lists  What this allows is dict item retrieval in constant time O 1   no matter the size number of elements in a dictionary   Having said that  once you sort its keys - sorted data keys     or values - sorted data values     you can then use that list to access keys values in design patterns such as these   for sortedKey in sorted dictionary       print dictionary sortedKeY    gives the values sorted by key  for sortedValue in sorted dictionary values         print sortedValue   gives the values sorted by value   Hope this helps

User · Answer

You could created sorted list from Values and rebuild the dictionary   myDictionary   two   2    one   1    five   5    1four   4    newDictionary     sortedList sorted myDictionary values     for sortedKey in sortedList      for key  value in myDictionary items            if value  sortedKey              newDictionary key  value   Output  newDictionary   one    1    two    2    1four    4    five    5

User · Answer

From your comment to gnibbler answer  i d say you want a list of pairs of key-value sorted by value   sorted data items    key lambda x x 1

User · Answer

To get the values use  sorted data values      To get the matching keys  use a key function  sorted data  key data get    To get a list of tuples ordered by value  sorted data items    key lambda x x 1     Related  see the discussion here  Dictionaries are ordered in Python 3 6

User · Answer

no lambda method    sort dictionary by value d     a1    fsdfds    g5    aa3432ff    ca   zz23432   def getkeybyvalue d i       for k  v in d items            if v    i              return  k   sortvaluelist   sorted d values    sortresult     for i1 in sortvaluelist         key   getkeybyvalue d i1      sortresult key    i1 print        sort by value        print  sortresult  print

User · Answer

In your comment in response to John  you suggest that you want the keys and values of the dictionary  not just the values   PEP 256 suggests this for sorting a dictionary by values   import operator sorted d iteritems    key operator itemgetter 1     If you want descending order  do this  sorted d iteritems    key itemgetter 1   reverse True

User · Answer

Sort the values   sorted data values      returns    a   b

User · Answer

Thanks for all answers  You are all my heros  -  Did in the end something like this  d   sorted data  key   data get   for key in d      text   data key

[python] sort dict by value python

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