我有一本包含值列表的字典。我想从值列表中取最高值

Question

假设我有一本字典

Y= {'town1'：‘中等’，‘低’，'town2'：‘高’，'town3'：‘中等’，‘严重’}

我希望字典只有一个值，而不是列表，并采用最高风险值。因此，对于城镇1，最高风险为中等，对于城镇2，风险为高，对于城镇3，风险的顺序为(“严重”，“高”，“中等”，低)

期望输出:Y= {'town1'：‘中等’，'town2'：‘高’，'town3'：‘严重’}

我的代码如下：

x = []
for k,v in y.items():
    x.append((k,v))

print(x)
for key, value in y.items():
    for i in range(len(x)):
        if 'severe' in x[i][1]:
            y[key] = 'severe'
        elif 'high' in x[i][1]:
            y[key] = ['high']
        elif 'moderate' in x[i][1]:
            y[key] = ['moderate']
        elif 'low' in x[i][1]:
            y[key] = ['low']

print(y)

Answer 1

您不必显式地遍历严重性列表，in操作符将为您执行此操作：

x = {'town1': ['moderate', 'low'], 'town2': ['high'], 'town3': ['moderate', 'severe']}
print(x)

y = {}
for key, values in x.items():
    if 'severe' in values:
        y[key] = ['severe']
    elif 'high' in values:
        y[key] = ['high']
    elif 'moderate' in values:
        y[key] = ['moderate']
    elif 'low' in values:
        y[key] = ['low']

print(y)