How to merge two dictionaries in python

merge_dicts.py

# delcare two dicts with x and y

x = dict(a=1, b=2)
y = dict(b=2, c=5)

## in python 3.5+ ##
z = { **x, **y}  # z = {'a': 1, 'b': 2, 'c': 5}

## in python 2.x ##

z = dict(x, **y)  # z = {'a': 1, 'c': 5, 'b': 2}