In a Python Google App Engine app I'm writing, I have an entity stored in the datastore that I need to retrieve, make an exact copy of it (with the exception of the key), and then put this entity back in.In a Python Google App Engine app I'm writing,
阅读背景：
使用Python在Google App Engine数据存储区中复制实体，而不必在“编译”时知道属性名称
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