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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 generate_env(self):
 """ Generate sample environment variables """

        for key in sorted(list(self.spec.keys())):
            if self.spec[key]['type'] in (dict, list):
                value = f"\'{json.dumps(self.spec[key].get('example', ''))}\'"
            else:
                value = f"{self.spec[key].get('example', '')}"
            print(f"export {self.env_prefix}_{key.upper()}={value}")