with语句有讲解么

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#1 Created at ... [Delete] [Delete and Lock User]

貌似还没出现过with语句

#2 Created at ... [Delete] [Delete and Lock User]

with self.assertRaises(ValueError):
            s1.get_grade()
        with self.assertRaises(ValueError):
            s2.get_grade()

根据报错信息判断，这个with应该是检测：后的语句块会不会抛出with（）里的错误。

抛出的错误不一样或者没有抛出错误就会报错。