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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 _declarations_as_string(self, declarations):
 """ Returns a list of declarations as a formatted CSS string :param declarations: The list of tinycss Declarations to format :type declarations: list of tinycss.css21.Declaration :returns: The CSS string for the declarations list :rtype: str """

        return ''.join('%s:%s%s;' % (
            d.name,
            d.value.as_css(),
            ' !' + d.priority if d.priority else '') for d in declarations)