Pony是Python的一種ORM,它允許使用生成器表達式來構造查詢,通過將生成器表達式的抽象語法樹解析成SQL語句。它也有在線ER圖編輯器可以幫助你創建Model。示例分析Pony語句:python元祖?select(p for p in Person if p.age > 20)翻譯成sql語句就是ÿ
python idePython id() function returns the “identity” of the object. The identity of an object is an integer, which is guaranteed to be unique and constant for this object during its lifetime. Python id()函數返回對象的“身份”。 一個對象的
AttributeMeaning?__doc__The function’s documentation string, or None if unavailable; not inherited by subclassesWritable__name__The function’s nameWritable__qualname__The function’s qualified name New in version 3.3. Writable__module__The name of the m