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x = {'a':1, 'b':2, 'c':{'d':3, 'e':4}}
 
res = [z for k, v in x.items() for z in ([k] if isinstance(v, int) else [[k, ck] for ck in v])]
print(res)

Success #stdin #stdout 0.02s 9100KB

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Standard input is empty

stdout

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['a', 'b', ['c', 'd'], ['c', 'e']]

https://ideone.com/ZbVKD1

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Python 3 (python 3.12)

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