merge two dictionaries in a single expression

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Giorgia
31 Feb 2019
1z = {**x, **y}  #python 3.5 and above
2
3z = x | y    #python 3.9+ ONLY
4
5def merge_two_dicts(x, y): # python 3.4 or lower
6      z = x.copy()   # start with x's keys and values
7      z.update(y)    # modifies z with y's keys and values & returns None
8      return z
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