请用代码描述如何定义异常类、抛出异常类以及捕捉异常类

'''
Exception
'''

class MyException(Exception):
    pass

num = 12

if num >= 10:
    raise MyException('抛出异常')
print('正常执行')

---------------------------------------------------------------------------

MyException                               Traceback (most recent call last)

<ipython-input-4-b1e683127a7f> in <module>
      9 
     10 if num >= 10:
---> 11     raise MyException('抛出异常')
     12 print('正常执行')


MyException: 抛出异常

try:
    if num >= 10:
        raise MyException('抛出异常')
    print('正常执行')
except MyException:
    print('发生异常')

发生异常

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69 - Python类是否支持多继承，请举例说明
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