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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 update_session_variables(self, variables_mapping):
 """ update session with extracted variables mapping. these variables are valid in the whole running session. """

        variables_mapping = utils.ensure_mapping_format(variables_mapping)
        self.session_variables_mapping.update(variables_mapping)
        self.test_variables_mapping.update(self.session_variables_mapping)