oo_filters.py 文件源码

def get_attr(data, attribute=None):
        """ This looks up dictionary attributes of the form a.b.c and returns
            the value.

            If the key isn't present, None is returned.
            Ex: data = {'a': {'b': {'c': 5}}}
                attribute = "a.b.c"
                returns 5
        """
        if not attribute:
            raise errors.AnsibleFilterError("|failed expects attribute to be set")

        ptr = data
        for attr in attribute.split('.'):
            if attr in ptr:
                ptr = ptr[attr]
            else:
                ptr = None
                break

        return ptr