Merging Dictionaries - Optimum Style?

[buran]

More or less it's a preference between 1 and 2 and will depend on use case
The third one is tricky as at least first term should be MergeDict, i.e. I think it's overkill
Also note that __add__() can return self, no need to do MergeDict(self), self is already instance of MergeDict class

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Just to add timeing for methods 1 and 2

# Merging Dictionaries: Different Styles
a = {'de': 'Germany'}
b = {'sk': 'Slovakia'}
c = {'fr': 'France'}

from timeit import timeit
# Sample-2: Update Method
def merge_dicts(diclist):
    td = {}
    for d in diclist:
        td.update(d)
    return td
 

print(timeit(stmt='md = {**a, **b, **c}', setup='from __main__ import a, b, c', number=100000))
print(timeit(stmt='md = merge_dicts([a, b, c])', setup='from __main__ import a, b, c, merge_dicts', number=100000))

Output:
0.05819004499994662
0.24759990400002607

clearly, star unpacking is faster