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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 __GetAuthorizationTokenUsingResourceTokens(resource_tokens, path, resource_id_or_fullname):
 """Get the authorization token using `resource_tokens`. :param dict resource_tokens: :param str path: :param str resource_id_or_fullname: :return: The authorization token. :rtype: dict """

    if resource_tokens and len(resource_tokens) > 0:
        # For database account access(through GetDatabaseAccount API), path and resource_id_or_fullname are '', 
        # so in this case we return the first token to be used for creating the auth header as the service will accept any token in this case
        if not path and not resource_id_or_fullname:
            return next(six.itervalues(resource_tokens))

        if resource_tokens.get(resource_id_or_fullname):
            return resource_tokens[resource_id_or_fullname]
        else:
            path_parts = []
            if path:
                path_parts = path.split('/')
            resource_types = ['dbs', 'colls', 'docs', 'sprocs', 'udfs', 'triggers',
                              'users', 'permissions', 'attachments', 'media',
                              'conflicts', 'offers']
            # Get the last resource id or resource name from the path and get it's token from resource_tokens
            for one_part in reversed(path_parts):
                if not one_part in resource_types and one_part in resource_tokens:
                    return resource_tokens[one_part]
    return None