import traceback

def throw_error():
  raise Exception("抛出一个异常")#异常被抛出，print函数无法执行
  print("飞天猪")
  
throw_error()

'''Traceback (most recent call last):
 File "C:\Users\Administrator\Desktop\systray.py", line 7, in <module>
  throw_error()
 File "C:\Users\Administrator\Desktop\systray.py", line 4, in throw_error
  raise Exception("抛出一个异常")#异常被抛出，print函数无法执行
Exception: 抛出一个异常'''

class MufCalc(object):
  m = False
  def calc(self,exp):
    try:
      return eval(exp)
    except ZeroDivisionError:
      if self.m:
        print("cool")
      else:
        raise

app = MufCalc()
app.calc(2/0)

class MyError(Exception):
  pass