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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 element_height_should_be(self, locator, expected):
 		"""Verifies the element identified by `locator` has the expected 		height. Expected height should be in pixels. 		| *Argument* | *Description* | *Example* | 		| locator | Selenium 2 element locator | id=my_id | 		| expected | expected height | 600 |"""


		self._info("Verifying element '%s' height is '%s'" % (locator, expected))
		self._check_element_size(locator, 'height', expected)