[Python] How do I preserve the order of keys when merging two Python dictionaries with...

I'm trying to merge two dictionaries in Python while not changing order, but also applying a custom rule for conflicts

d1 = {"a": 1, "b": 2, "c": 3}

d2 = {"b": 20, "d": 4}


result = {}
for k, v in d1.items():
if k in d2:
result[k] = [v, d2[k]]
else:
result[k] = v

for k, v in d2.items():
if k not in result:
result[k] = v


result I want

{"a": 1, "b": [2, 20], "c": 3, "d": 4}

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