python 异常的嵌套

‘’’ 异常的嵌套 ‘’’ try: f = open(‘a.txt’) try: ret = f.readline() print(ret) finally: f.close() print(‘文件已关闭’) except FileNotFoundError: print(‘文件未找到’) except UnicodeDecodeError: print(‘编码错误’) ‘’‘如果try是嵌套的

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