How can I convert a dictionary into a list of tuples

Question

If I have a dictionary like      a   1   b   2   c   3     How can I convert it to this       a   1     b   2     c   3      And how can I convert it to this      1   a     2   b     3   c

User · Answer

a    a   1   b   2   c   3          x a x   for x in a keys        a   1     c   3     b   2          a x  x  for x in a keys       1   a     3   c     2   b

User · Answer

What you want is dict s items   and iteritems   methods  items returns a list of  key value  tuples  Since tuples are immutable  they can t be reversed  Thus  you have to iterate the items and create new tuples to get the reversed  value key  tuples  For iteration  iteritems is preferable since it uses a generator to produce the  key value  tuples rather than having to keep the entire list in memory   Python 2 5 1  r251 54863  Jan 13 2009  10 26 13    GCC 4 0 1  Apple Inc  build 5465   on darwin Type  help    copyright    credits  or  license  for more information   gt  gt  gt  a      a   1   b   2   c   3    gt  gt  gt  a items      a   1     c   3     b   2    gt  gt  gt    v k  for  k v  in a iteritems      1   a     3   c     2   b     gt  gt  gt

User · Answer

You can use list comprehensions     k v  for k v in a iteritems       will get you     a   1     b   2     c   3    and     v k  for k v in a iteritems       the other example   Read more about list comprehensions if you like  it s very interesting what you can do with them

User · Answer

d     John  5   Alex  10   Richard   7  list      for i in d     k    i d i      list append k   print list

User · Answer

k v  for  k v  in d iteritems      and    v k  for  k v  in d iteritems

User · Answer

These are the breaking changes from Python 3 x and Python 2 x  For Python3 x use  dictlist      for key  value in dict items        temp    key value      dictlist append temp    For Python 2 7 use   dictlist      for key  value in dict iteritems        temp    key value      dictlist append temp

User · Answer

Create a list of namedtuples  It can often be very handy to use namedtuple  For example  you have a dictionary of  name  as keys and  score  as values like   d     John  5   Alex  10   Richard   7    You can list the items as tuples  sorted if you like  and get the name and score of  let s say the player with the highest score  index 0  very Pythonically like this    gt  gt  gt  player   best 0    gt  gt  gt  player name          Alex   gt  gt  gt  player score          10   How to do this   list in random order or keeping order of collections OrderedDict   import collections Player   collections namedtuple  Player    name score   players   list Player  item  for item in d items       in order  sorted by value   score     import collections Player   collections namedtuple  Player    score name     sorted with lowest score first   worst   sorted Player v k  for  k v  in d items      sorted with highest score first   best   sorted  Player v k  for  k v  in d items     reverse True

User · Answer

since no one else did  I ll add py3k versions    gt  gt  gt  d      a   1   b   2   c   3    gt  gt  gt  list d items       a   1     c   3     b   2    gt  gt  gt    v  k  for k  v in d items      1   a     3   c     2   b

User · Answer

By keys   and values   methods of dictionary and zip   zip will return a list of tuples which acts like an ordered dictionary   Demo    gt  gt  gt  d      a   1   b   2   c   3    gt  gt  gt  zip d keys    d values       a   1     c   3     b   2    gt  gt  gt  zip d values    d keys      1   a     3   c     2   b

User · Answer

gt  gt  gt  d      a   1   b   2   c   3    gt  gt  gt  d items      a   1     c   3     b   2    gt  gt  gt    v  k  for k  v in d iteritems      1   a     3   c     2   b      It s not in the order you want  but dicts don t have any specific order anyway 1 Sort it or organize it as necessary   See  items    iteritems      In Python 3 x  you would not use iteritems  which no longer exists   but instead use items  which now returns a  view  into the dictionary items  See the What s New document for Python 3 0  and the new documentation on views   1  Insertion-order preservation for dicts was added in Python 3 7

User · Answer

A simpler one would be list dictionary items       list of  key  value  tuples list zip dictionary values    dictionary keys        list of  key  value  tuples

[python] How can I convert a dictionary into a list of tuples?

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