javascript 与python 删除重复数组对象

javascript 版

/*JS删除数组对象中的重复元素并保持顺序不变,*/
function* arraySet(items, key=null) {
    let s = new Set();
    for (let item of items) {
         let value = key ? key(item) : item;
        !s.has(value) && (yield item, s.add(value))
    }
}

var ret = arraySet([    
    {a: 1, b: 2},
    {a: 1, b: 2},
    {a: 3, b: 2},
    {a: 4, b: 2},
    {a: 3, b: 2},
    {a: 1, b: 2},
], item=> [item['a'], item['b']].join(''));

console.log(...ret);
// [ { a: 1, b: 2 }, { a: 3, b: 2 }, { a: 4, b: 2 } ]

python 版

# 删除列表中的重复元素并保持顺序不变, 列表元素为散列类型"""
def listSet(items, key=None):
    s = set()
    for item in items:
        val = item if key is None else key(item)
        if val not in s:
            yield item
            s.add(val)

arr1 = [
        {'x': 1, 'y': 3},
        {'x': 3, 'y': 3},
        {'x': 2, 'y': 3},
        {'x': 1, 'y': 3},
        {'x': 2, 'y': 3}
    ]

print(list(listSet(arr1, key=lambda item: (item['x'], item['y']))))
# [{'x': 1, 'y': 3}, {'x': 3, 'y': 3}, {'x': 2, 'y': 3}]