ValueError: I/O operation on closed file 解决办法

报错：ValueError: I/O operation on closed file

ValueError: I/O operation on closed file。是指处理了已经被关闭的数据。一般是语句没有对齐。当python的处理代码不对齐的时候会出现这种情况。
使用with方法打开了文件，生成的文件操作实例在with语句之外是无效的，因为with语句之外文件已经关闭了。

报错部分代码：


class Maoyan(object):...def run(self):response = self.get_data()datas = self.parse_data(response)self.save_data(datas)if __name__ == '__main__':...with open('猫眼.csv', 'a', newline='', encoding="utf8") as f:csv_writer = csv.writer(f)csv_writer.writerow(head)maoyan = Maoyan()maoyan.run()

解决：

检查了很多遍，因为已经确认了是缩进的问题，最后才发现最后两行代码也要缩进，因为调用的保存也要在with语句块里能有效。

改成图片里这样就可以运行了！

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