List of tuples to dictionary

Question

Here s how I m currently converting a list of tuples to dictionary in Python   l      a  1    b  2   h       h update  k v   for k v in l   gt   None  None  h  gt    a   1   b   2    Is there a better way   It seems like there should be a one-liner to do this

User · Answer

With dict comprehension     h    k v for k v in l

User · Answer

The dict constructor accepts input exactly as you have it  key value tuples     gt  gt  gt  l      a  1    b  2    gt  gt  gt  d   dict l   gt  gt  gt  d   a   1   b   2    From the documentation      For example  these all return a   dictionary equal to   one   1   two     2    dict one 1  two 2  dict   one   1   two   2   dict zip   one    two     1  2    dict    two   2     one   1

User · Answer

Functional decision for  pegah answer  from itertools import groupby  mylist      a   1     b   3     a   2     b   4    mylist   iter    a   1     b   3     a   2     b   4     result     k     map lambda v  v 1   values       for k  values in groupby sorted mylist  key lambda x  x 0    lambda x  x 0          print result      a    1  2    b    3  4

User · Answer

It seems everyone here assumes the list of tuples have one to one mapping between key and values  e g  it does not have duplicated keys for the dictionary   As this is the first question coming up searching on this topic  I post an answer for a more general case where we have to deal with duplicates   mylist     a 1   a 2   b 3       result      for i in mylist       result setdefault i 0      append i 1   print result   gt  gt  gt  result    a  1 2   b  3

User · Answer

Just call dict   on the list of tuples directly   gt  gt  gt  my list      a   1     b   2    gt  gt  gt  dict my list    a   1   b   2

[python] List of tuples to dictionary

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