如何合并字典数组中的重复键

def merge_dicts(dict_list):
    merged_dict = {}
    for d in dict_list:
        for key, value in d.items():
            if key in merged_dict:
                if isinstance(merged_dict[key], list):
                    merged_dict[key].append(value)
                else:
                    merged_dict[key] = [merged_dict[key], value]
            else:
                merged_dict[key] = value
    return merged_dict

# 示例字典数组
dict_array = [
    {'a': 1, 'b': 2},
    {'b': 3, 'c': 4},
    {'a': 5, 'd': 6}
]

# 合并字典数组
merged_dict = merge_dicts(dict_array)
print(merged_dict)

{'a': [1, 5], 'b': [2, 3], 'c': 4, 'd': 6}