返回对象的帮助文档
In [1]: help(xiaoming) Help on Student in module __main__ object: class Student(builtins.object) | Methods defined here: | | __init__(self, id, name) | | __repr__(self) | | Data descriptors defined here: | | __dict__ | dictionary for instance variables (if defined) | | __weakref__ | list of weak references to the object (if defined)