循环浏览从yaml加载的嵌套python字典/列表

Question

Ok, this is probably stupid. Basically i'm trying to loop through my nested yaml-file and do stuff with for example every key-a value in my list. I have read alot and i'm able to loop through a nested dictionary without the list but I don't wan't to use unique key's for the nodes.

This works:

lev-0a: lev-1a: node1: key-a: '1'

node2:
 key-a: '2'

But when i'm trying to iterate a nested dict with "list" objects it fails.

Yaml:

lev-0a:
  lev-1a:
    - key-a: '1'
      key-b: '2'
      key-c: '3'
      key-d:
        level-2:
          - key: 'a'
          - key: 'b'
          - key: 'c'

    - key-a: '7'
      key-b: '8'
      key-c: '9'
      key-d:
        level-2:
          - key: 'x'
          - key: 'y'
          - key: 'z'

Print settings from python:

{'lev-0a': {'lev-1a': [{'key-c': '3', 'key-b': '2', 'key-a': '1', 'key-d': {'level-2': [{'key': 'a'}, {'key': 'b'}, {'key': 'c'}]}}, {'key-c': '9', 'key-b': '8', 'key-a': '7', 'key-d': {'level-2': [{'key': 'x'}, {'key': 'y'}, {'key': 'z'}]}}]}}

My code:

env.settings_file = env.setting_path + '/settings.yaml'

def load_settings(settings=env.settings_file):
    try:
        with open(settings) as stream:
            data = yaml.load(stream)
            return data
    except IOError as error:
        print ('File error: ' + str(error))


def dev(settings=load_settings()):

    for k, v in settings['lev-0a']['lev-1a'].iteritems():
        print v['key-a']
        # do stuff with every key-a value

Error:

TypeError: list indices must be integers, not str

If I do this:

for k, v in settings['lev-0a']['lev-1a'][0].iteritems():
    print k,v

I will get:

key-c 3
key-b 2
key-a 1
key-d {'level-2': [{'key': 'a'}, {'key': 'b'}, {'key': 'c'}]}

Thanks!

Answer 1

This alone should have raised an error: settings['lev-0a']['lev-1a'].iteritems(): . In your code, the value pointed to by ['lev-1a'] appears to be a list , not a dict , so calling iteritems() on it is very suspect.

What you seem to have been looking for is something like:

for dict1a in settings['lev-0a']['lev-1a']:
    print dict1a['key-a']

That prints both [ key-a ] values found inside of the two dicts from the ['lev-1a'] list. Does this answer your question at all? I have to admit I am not certain I fully understand your question. Feel free to elaborate and I'll edit accordingly.