Group dictionary key values in python

Question

I have the following dictionary

mylist = [{\'tpdt\': \'0.00\', \'tmst\': 45.0, \'tmdt\': 45.0, \'pbc\': 30, \'remarks\': False, \'shift\': 1, \'ebct\': \'0.         


        

Answer 1

You can use itertools.groupby:

>>> for key, group in itertools.groupby(mylist, lambda item: item["mc_no"]):
...     print key, sum([item["tmst"] for item in group])
... 
KA20 90.0
KA23 110.0

Note that for groupby to work properly, mylist has to be sorted by the grouping key:

from operator import itemgetter

mylist.sort(key=itemgetter("mc_no"))