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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_command(self):
 """ Generate a sample command """

        example = []
        example.append(f"{sys.argv[0]}")
        for key in sorted(list(self.spec.keys())):
            if self.spec[key]['type'] == list:
                value = " ".join(self.spec[key].get('example', ''))
            elif self.spec[key]['type'] == dict:
                value = f"\'{json.dumps(self.spec[key].get('example', ''))}\'"
            else:
                value = self.spec[key].get('example', '')
            string = f"     --{key.lower()} {value}"
            example.append(string)
        print(" \\\n".join(example))