如何从字典列表中删除重复项？

def remove_duplicates(dict_list, key=None):
    seen = set()
    unique_list = []
    
    for d in dict_list:
        if key:
            dict_tuple = tuple(d[key].items())
        else:
            dict_tuple = tuple(d.items())
        
        if dict_tuple not in seen:
            seen.add(dict_tuple)
            unique_list.append(d)
    
    return unique_list

# 示例数据
data = [
    {'id': 1, 'name': 'Alice'},
    {'id': 2, 'name': 'Bob'},
    {'id': 1, 'name': 'Alice'},
    {'id': 3, 'name': 'Charlie'}
]

# 基于整个字典去重
unique_data = remove_duplicates(data)
print("基于整个字典去重:", unique_data)

# 基于特定键去重
unique_data_by_key = remove_duplicates(data, key='id')
print("基于特定键去重:", unique_data_by_key)