首先，你需要将yaml文件加载到一个python嵌套的字典对象（键/值对）中。之后，你就可以用dict.get（'key'）方法访问字典的值了。

# Read yaml file into nested dictionary
import yaml
fileName = '/tmp/testbed1.yaml'
with open(fileName, 'r') as yamlFile:
    data = yaml.load(yamlFile)

# Get target value
target = data.get('devices').get('NN41_R11')

# Pretty print nested dictionary (or simply print)
__import__('pprint').pprint(target)

你可以用下面的代码来实现。

import yaml with open("sample.yaml") as stream:
     my_dict = yaml.safe_load(stream)
     print (my_dict['devices']['NN41_R11'])
     print (my_dict.get('devices').get('NN41_R11'))
     #both the lines with give the same result you can use any

类似地，在迭代键时，您可以进入另一个嵌套字段并获取值。