为处理不同场景下的非零返回问题，提供了以下几种完整代码示例： #### 处理除零错误 ```python import sys def divide_numbers(num1, num2): try: result = num1 / num2 return result except ZeroDivisionError: print("除数不能为零") return None def main(): num1 = 10 num2 = 0 result = divide_numbers(num1, num2) if result is not None: return 0 # 正常返回 else: return 1 # 异常返回 if __name__ == "__main__": sys.exit(main()) ``` #### 处理文件读取异常 ```python import sys def read_file(file_path): try: with open(file_path, 'r') as file: content = file.read() return content except FileNotFoundError: print(f"文件 {file_path} 未找到") return None except Exception as e: print(f"读取文件时出现其他错误: {e}") return None def main(): file_path = 'non_existent_file.txt' content = read_file(file_path) if content is not None: return 0 # 正常返回 else: return 1 # 异常返回 if __name__ == "__main__": sys.exit(main()) ``` #### 处理自定义异常 ```python import sys class CustomError(Exception): pass def validate_input(value): if value < 0: raise CustomError("输入值不能为负数") return value def main(): try: num = -1 result = validate_input(num) return 0 # 正常返回 except CustomError as e: print(e) return 1 # 异常返回 if __name__ == "__main__": sys.exit(main()) ```