1、在 models.py python;中创建、修改模型（如添加字段、修改字段类型、删除字段等）、删除模型后，执行如下命令，就能生成迁移文件。
After keeping in mind that HTML has both an SGML and XML serialisations, which are just encodings for a parser to \"explode\" into a DOM, I\'m wondering whether there are other serialisations for HTML
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