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data = [
  { "key1": 1, "key2", 2, "key3", 3 },
  { "key1": 4, "key2", 5, "key3", 6 }
]

[ r for r in data ] # 同じリストdictを返す
[ d for d in r for r in data ] # 1つのリストにして返す
[ k for k, v in r.items() for r in data ] # key