Create a list of names whose height is higher than 160 - 关于嵌套字典循环的解释

Question

patients_dict = {"Anna": {'age':16, 'height':165, 'weight':65},
                 "Barbara" : {'age':100, 'height':120, 'weight':40},
                  "Carlo" : {'age':36, 'height':150, 'weight':60},
                 "Dende" : {'age':27, 'height':183, 'weight':83}}

# Create a list of names whose height is higher than 160

你能帮我找到解决办法吗？我正在学习 python，我知道骑自行车等，但令我烦恼的是嵌套字典。不知何故我无法轻松访问它。

如果您还可以添加一些关于如何访问和循环嵌套字典的说明，我将不胜感激。谢谢

Answer 1

当你处理 dict 时，你可以利用 items() method 来循环它。

这里有一个关于如何做到这一点的明确代码：

patients_dict = {"Anna": {'age':16, 'height':165, 'weight':65},
                 "Barbara" : {'age':100, 'height':120, 'weight':40},
                  "Carlo" : {'age':36, 'height':150, 'weight':60},
                 "Dende" : {'age':27, 'height':183, 'weight':83}}

tall_patients = []

for patient, infos in patients_dict.items():
    # Values for the first iteration:
    # patient -> Anna
    # infos -> {'age':16, 'height':165, 'weight':65}
    for info, value in infos.items():
        # Values for the first iteration:
        # info -> age
        # value -> 16
        if info == "height":
            if value > 160:
                tall_patients.append(patient)

print(tall_patients)

如果你觉得舒服，你可以使用一个衬垫以更 pythonic 的方式来完成它（感谢）：

patients_dict = {"Anna": {'age':16, 'height':165, 'weight':65},
                 "Barbara" : {'age':100, 'height':120, 'weight':40},
                  "Carlo" : {'age':36, 'height':150, 'weight':60},
                 "Dende" : {'age':27, 'height':183, 'weight':83}}
tall_patients = [name for name, data in patients_dict.items() if data['height'] > 160]
print(tall_patients)

输出： ['Anna', 'Dende']

Create a list of names whose height is higher than 160 - 关于嵌套字典循环的解释

Create a list of names whose height is higher than 160 - Explanation on nested dicts cycling

python

dictionary

loops

nested