python必备内置函数- ssubclass(class, classinfo)

在python中以is开头的都是bool型的，用来判断

issubclass是用来判断，是不是子类。是返回True不是返回False

如果class是classinfo类的子类，返回True：

In [27]: class undergraduate(Student):
    ...:     def studyClass(self):
    ...:         pass
    ...:     def attendActivity(self):
    ...:         pass
    ...:

In [28]: issubclass(undergraduate,Student)
Out[28]: True

In [29]: issubclass(object,Student)
Out[29]: False

In [30]: issubclass(Student,object)
Out[30]: True

如果class是classinfo元组中某个元素的子类，也会返回True

In [26]: issubclass(int,(int,float))
Out[26]: True