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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_asset_url(self, path):
 		""" 		Get the URL of an asset. If asset hashes are added and one exists for 		the path, it will be appended as a query string. 		Args: 		 path (str):
 Path to the file, relative to your "assets" directory. 		"""

		url = self.root_url + '/assets/' + path
		if path in self.asset_hash:
			url += '?' + self.asset_hash[path]
		return url