x = {'a': 1, 'b': 2}
y = {'b': 3, 'c': 4}
z = {**x, **y}

z = {}
for d in list_of_dicts:
    z.update(d)

>>> a = {1:11}
>>> b = {2:22}
>>> c = {3:33}
>>> list_abc = [a,b,c]
>>> from collections import ChainMap
>>> dict(ChainMap(*list_abc))
{1: 11, 2: 22, 3: 33}
>>>