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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def get(key, default=''):
    '''
    defaults.get is used much like pillar.get except that it will read
    a default value for a pillar from defaults.json or defaults.yaml
    files that are stored in the root of a salt formula.

    CLI Example:

    .. code-block:: bash

        salt '*' defaults.get core:users:root

    The defaults is computed from pillar key. The first entry is considered as
    the formula namespace.

    For example, querying ``core:users:root`` will try to load
    ``salt://core/defaults.yaml`` and ``salt://core/defaults.json``.
    '''

    # Determine formula namespace from query
    if ':' in key:
        namespace, key = key.split(':', 1)
    else:
        namespace, key = key, None

    # Fetch and load defaults formula files from states.
    defaults = _load(namespace)

    # Fetch value
    if key:
        return salt.utils.data.traverse_dict_and_list(defaults, key, default)
    else:
        return defaults