用于分类列表中对象的速度的字典

Question

我很难用字典来分类物体的速度。

输入：

Object_dict={“空客380”：{“国家”：“法国、德国、西班牙、英国”、“最高速度(马赫)”：0.89}、“协和”：{“国家”：“法国、英国”、“最高速度(马赫)”：2.01}、“波音X-43”：{“国家”：“美国”、“最高速度(马赫)”：9.6}}

输出：

Objects_by_Mach={“亚音速”：“空客380"，”跨音速“：[]，”超音速“：”协和“，”高超音速“：”波音X-43"}

这是我的密码：

Mach_scale = {"Subsonic": 0,
                   "Transonic": 1,
                   "Supersonic":5,
                   "Hypersonic":5 ,
                   }

#Subsonic object has speed of Mach<0
#Transsonic object has speed of Mach=1
#Supersonic object has speed of 1<Mach<5
#Hypersonic object has speed of Mach>5

def mach_speeds(dict1):   
Objects_by_Mach={}   

for object,data in dict1.items():    
 for value in data["Top Speed(Mach)"]:
    Subsonic=[object for object in dict1 if value<=Mach_scale["Transonic"] and value>Mach_scale["Subsonic"] in dict1["Top Speed(Mach)"] in dict1.values()]      
    Transonic=[object for object in dict1 if value==Mach_scale["Transonic"] in Mach_scale["Top Speed(Mach)"] in dict1.values()]     
    Supersonic=[object for object in dict1 if value<=Mach_scale["Supersonic"] and value>Mach_scale["Transonic"] in dict1["Top Speed(Mach)"] in dict1.values()]      
    Hypersonic=[object for object in dict1 if value>Mach_scale["Hypersonic"] in dict1["Top Speed(Mach)"] in dict1.values()]



return Objects_by_Mach.update({"Subsonic":Subsonic,"Transonic":Transonic,"Supersonic":Supersonic,"Hypersonic":Hypersonic})


print(mach_speeds(Object_dict))

再次感谢各位朋友。

Answer 1

您可以通过为Mach标度指定范围来概括并缩短代码。这里使用的值可能不正确，但可以很容易地调整以适应。

Mach_scale = {"Subsonic": (0.0, 0.8),
          "Transonic": (0.8, 1.2),
          "Supersonic": (1.2, 5.0),
          "Hypersonic": (5.0, 10.0),
          "High-hypersonic": (10.0, float('inf'))
          }

Object_dict = {"Airbus 380": {"Country": "France,Germany,Spain,UK", "Top Speed(Mach)": 0.89},
            "Concorde": {"Country": "France,UK", "Top Speed(Mach)": 2.01},
            "Boeing X-43": {"Country": "USA", "Top Speed(Mach)": 9.6}}

result = dict()

def getmach(m):
    for k, v in Mach_scale.items():
        if m >= v[0] and m < v[1]:
            return k

for k, v in Object_dict.items():
    result.setdefault(getmach(v['Top Speed(Mach)']), []).append(k)

print(result)

输出：

{'Subsonic': ['Airbus 380'], 'Transonic': ['Concorde'], 'Hypersonic': ['Boeing X-43']}

Answer 2

首先，请注意，这个问题是非常具体的，很可能只会帮助你，我们喜欢的问题是一般性的，将帮助尽可能多的人！

在您的代码中有一些东西被认为是错误的实践，并且是有问题的。

首先看起来缩进不是correct

• Second，--不要使用保留的单词对象--使用不同的变量名

• 注意，在每次迭代中，您要创建一个新的列表，在我看来您希望更新它，而不是创建一个新的列表。

我会尝试下面的代码：

input = {
    "Airbus 380":{"Country":"France,Germany,Spain,UK","Top Speed(Mach)":0.89},
    "Concorde":{"Country":"France,UK","Top Speed(Mach)":2.01},
    "Boeing X-43":{"Country": "USA","Top Speed(Mach)":9.6}
}

mach_scale = {"Subsonic": 0.8,
              "Transonic": 1.2,
              "Supersonic":5,
              "Hypersonic":5
             }

"""
subsonic speed - below 0.8 mach
transonic speed - between 0.8 - 1.2 mach
supersonic speed - between 1.2 - 5 mach
hypersonic speed - above 5 mach
"""

def mach_speeds(airplane_data):
    subsonic, transonic, supersonic, hypersonic = [], [], [], []
    for plane, data in airplane_data.items():
        top_speed = data["Top Speed(Mach)"]

        if top_speed <= mach_scale["Subsonic"]:
            subsonic.append(plane)
        elif top_speed <= mach_scale["Transonic"]:
            transonic.append(plane)
        elif top_speed <= mach_scale["Supersonic"]:
            supersonic.append(plane)
        else:
            hypersonic.append(plane)

    result = {}
    result["Subsonic"] = subsonic
    result["Transonic"] = transonic
    result["Supersonic"] = supersonic
    result["Hypersonic"] = hypersonic

    return result


if __name__ == "__main__":
    print(mach_speeds(input))

输出：

{'Subsonic': [], 'Transonic': ['Airbus 380'], 'Supersonic': ['Concorde'], 'Hypersonic': ['Boeing X-43']}