Question

I use PyYAML to work with YAML files.
I wonder how I can properly check existence of some key? In the example below title key is present only for list1. I want to process title value properly if it exists, and ignore if it is not there.

list1:
    title: This is the title
    active: True
list2:
    active: False

Answer 1

Once you load this file with PyYaml, it will have a structure like this:

{
'list1': {
    'title': "This is the title",
    'active': True,
    },
'list2: {
    'active': False,
    },
}

You can iterate it with:

for k, v in my_yaml.iteritems():
    if 'title' in v:
        # the title is present
    else:
        # it's not.