python简说（二十六）异常

# try:
#     res = 1 / 0
# except ZeroDivisionError as e:
#     print('出错啦，除数不能为0',e)

# l = list()
# l.append(1)
# d = dict()
# # d['name']='abc'
# try:
#     print(d['name'])
#     print(l[-1])
# except IndexError as e:
#     print('出错了，下标越界',e)
# except KeyError as e:
#     print('字典key不存在',e)
# except Exception as e:
#     print('未知异常',e)
# else:
#     print('没有出现异常。。。')
# finally:
#     print('什么时候都执行finally')

主动抛出来一个异常，不往下走了
raise NumberError('输入的数字不对')