How to merge two python dictionaries

# How to merge two dictionaries
# in Python 3.5+:

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

# In Python 2.x you could use this:

>>> z = dict(x, **y)
>>> z
{'a': 1, 'c': 4, 'b': 3}