如何使用ruamel.yaml添加节点

Question

I tried to add a new node following the example but:

myitems = ruamel.yaml.load(inp, ruamel.yaml.RoundTripLoader)
myitems['abc'].append('test')

gives me an error:

Traceback (most recent call last):
  File "item_updater.py", line 148, in <module>
    myitems['wohnung'].append('test')
AttributeError: 'CommentedMap' object has no attribute 'append'

I am using ruamel.yaml v0.13.7

What am I doing wrong?

Answer 1

Your error doesn't come from the example you indicated, as in the inp of the example there is no wohnung that shows up in your error.

You probably forgot a - somewhere:

wohnung:
   a: 1

instead of:

wohnung:
- a: 1

only on the latter you can append using myitems['wohnung'].append('test') .

The example works, but without showing your real YAML input it is difficult to see what is the exact cause of your error.