如何从列表中清除除一件以外的任何内容？(python)

def remove_all_but_one(lst, item_to_keep):
    return [item for item in lst if item == item_to_keep]

# 示例使用
my_list = [1, 2, 3, 4, 5, 2]
item_to_keep = 2
result = remove_all_but_one(my_list, item_to_keep)
print(result)  # 输出: [2, 2]

def remove_all_but_one(lst, item_to_keep):
    result = []
    for item in lst:
        if item == item_to_keep:
            result.append(item)
    return result

# 示例使用
my_list = [1, 2, 3, 4, 5, 2]
item_to_keep = 2
result = remove_all_but_one(my_list, item_to_keep)
print(result)  # 输出: [2, 2]