用于对列表中对象的速度进行分类的字典

Question

我在使用字典对物体速度进行分类时遇到困难。

输入：

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}}

输出：

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

这是我的代码：

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))

再次提前感谢各位 SO'ers。

Answer 1

您可以通过指定马赫标度的范围来概括并因此缩短您的代码。此处使用的值可能不正确，但可以轻松调整以适应。

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，这个问题非常具体，很可能只会帮助您，我们喜欢笼统的问题，并且会帮助尽可能多的人！

您的代码中有些东西被认为是不好的做法并且存在问题。

首先看起来缩进不正确
其次，不要使用保留字对象——使用不同的变量名
请注意，在我看来，在每次迭代中您都在创建一个新列表您想要更新它 - 而不是创建一个新的。

我会尝试类似下面的代码：

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']}

用于对列表中对象的速度进行分类的字典

Dictionary to classify speed of objects in a list

python

dictionary

loops

function