迭代字符串和浮点数以在字典中找到最小值的问题

Question

我需要你的帮助来解决可迭代和不可迭代的值以找到最小值。

输入：

D1={"Arcadia":{"Month": "January","Atmospheric pressure(hPa)":1013.25},"Xanadu":{"Month:"January","Atmospheric Pressure(hPa)":"No information"},"Atlantis":{"Month":"January","Atmospheric Pressure(hPa):2035.89}}

输出：

气压最低的城市是Arcadia，大气压为1013.25

这是我的代码：

 def lowest_pressure(dict1):
  dict_pressure={}  
  exclude = "No information"
  for city,data in dict1.items():
   for value in str(data["Atmospheric Pressure(hPa)"]):
     if value != exclude:
      dict_pressure[city]=data["Atmospheric Pressure(hPa)"]

  low_pressure=min(dict_pressure,key=dict_pressure.get)
  print(f"The city that has the lowest Atmospheric Pressure is {low_pressure} with ${dict_pressure[low_pressure}hPa.") 

lowest_pressure(D1)

如果有词典理解我也想知道

再次感谢 SO 社区。

Answer 1

将字典内容编辑成我认为应该的样子，生成的代码应该足够了：

D1 = {"Arcadia": {"Month": "January", "Atmospheric Pressure(hPa)": 1013.25},
    "Xanadu": {"Month": "January", "Atmospheric Pressure(hPa)": "No information"},
    "Atlantis": {"Month": "January", "Atmospheric Pressure(hPa)": 2035.89}
    }


t = []

for k, v in D1.items():
    try:
        t.append((float(v['Atmospheric Pressure(hPa)']), k))
    except ValueError:
        pass

if t:
    p, c = min(t)
    print(f'The city with the lowest pressure is {c} with the Atmospheric Pressure of {p:.2f}')
else:
    print('No valid pressure measurements available')

输出：

The city with the lowest pressure is Arcadia with the Atmospheric Pressure of 1013.25

Answer 2

D1={"Arcadia":{"Month": "January","Atmospheric Pressure(hPa)":1013.25},"Xanadu":{"Month":"January","Atmospheric Pressure(hPa)":"No information"},"Atlantis":{"Month":"January","Atmospheric Pressure(hPa)":2035.89}}

country_pressure = {a:D1[a]["Atmospheric Pressure(hPa)"] for a in D1} 

min_pressure = min([a for a in country_pressure.values() if type(a)==int or type(a) ==float])

lowest_pressure_country = None
for k,v in country_pressure.items():
    if v==min_pressure:
        lowest_pressure_country = k
        break

print(f'The city with lowest pressure is {lowest_pressure_country}')

迭代字符串和浮点数以在字典中找到最小值的问题

Problem of iterating over string and float to find minimum value in dictionary

python

loops

dictionary

iterable