如何获取按三个条件排序的字典列表

Question

我想得到一个根据以下规则排序的列表persons.sort(key = lambda p: (abs(p["height"] - 180), p["weight"]==75, p["weight"])) 即我需要它首先按其与高度 180 的接近程度进行排序，然后是所有等于 75 的权重值，然后我想要它们按权重升序排列...

我想出了以下代码，但它不起作用...

def get_ordered_list(persons):
    persons.sort(key = lambda p: p["name"] )
    persons.sort(key = lambda p: (abs(p["height"] - 180), p["weight"]==75, p["weight"]))
    return persons

以下面的示例数据为例，

array = [{"name": "Guido Batista", "height": 195, "weight": 110},
    {"name":"Heitor Tostes", "height": 180, "weight": 75},
    {"name":"Bruno Costa", "height": 180, "weight": 75},
    {"name":"Joao Kleber", "height": 180, "weight": 65},
    {"name":"Rafael Rodrigues", "height": 165, "weight": 110},
    {"name":"Ricardo Neto", "height": 170, "weight": 70},
    {"name":"Juca Carvalho", "height": 180, "weight": 77}]
    

我需要将列表按如下方式排序：

[
      {"name":"Bruno Costa", "height": 180, "weight": 75},
      {"name":"Heitor Tostes", "height": 180 , "weight": 75},
      {"name":"Joao Kleber", "height": 180, "weight": 65},
      {"name":"Juca Carvalho", "height": 180, "weight": 77},
      {"name":"Ricardo Neto", "height": 170, "weight": 70},
      {"name": "Guido Batista", "height": 195, "weight": 110},
      {"name":"Rafael Rodrigues", "height": 165, "weight": 110},
]

Answer 1

发生这种情况是因为False 的值低于True。使用

 persons.sort(key = lambda p: (abs(p["height"] - 180), p["weight"]!=75, p["weight"]))

更改“重量”键的比较。

Answer 2

这将提供所需的结果，而不会进一步复杂化：

persons.sort(key = lambda p: (abs(p["height"] - 180), not(p["weight"]==75), p["weight"]))

默认情况下，排序顺序是升序。最后一个难题是这个（来自doc）

布尔值：这些表示真值 False 和 True。他们俩 表示值 False 和 True 的对象是唯一的布尔值 对象。 Boolean 类型是纯整数的子类型，Boolean 在几乎所有的情况下，值的行为分别类似于值 0 和 1 上下文，例外是当转换为字符串时， 分别返回字符串“False”或“True”

按照升序，0 在 1 之前，这就是为什么上面发布的这行代码可以解决问题。

Answer 3

试试：

array = [
    {"name": "Guido Batista", "height": 195, "weight": 110},
    {"name": "Heitor Tostes", "height": 180, "weight": 75},
    {"name": "Bruno Costa", "height": 180, "weight": 75},
    {"name": "Joao Kleber", "height": 180, "weight": 65},
    {"name": "Rafael Rodrigues", "height": 165, "weight": 110},
    {"name": "Ricardo Neto", "height": 170, "weight": 70},
    {"name": "Juca Carvalho", "height": 180, "weight": 77},
]

array = sorted(
    array,
    key=lambda p: (
        abs(p["height"] - 180),
        p["weight"] != 75,
        p["name"],
        -p["weight"],
    ),
)
print(array)

打印：

[
    {"name": "Bruno Costa", "height": 180, "weight": 75},
    {"name": "Heitor Tostes", "height": 180, "weight": 75},
    {"name": "Joao Kleber", "height": 180, "weight": 65},
    {"name": "Juca Carvalho", "height": 180, "weight": 77},
    {"name": "Ricardo Neto", "height": 170, "weight": 70},
    {"name": "Guido Batista", "height": 195, "weight": 110},
    {"name": "Rafael Rodrigues", "height": 165, "weight": 110},
]