@classmethod
def parse_string(cls, string):
    """Key-value string parser.

        Replaces a string containing a placeholder with it's stored value.

        Args:
            string (str): String to scan and update.

        Returns:
            str: Updated string.
        """
    for k, v in cls.storage.iteritems():
        string = string.replace('<%s>' % k, v)
    return string
