python -多分支和异常的捕获

多分支：被监测的代码块抛出的异常有多种可能性，并且我们需要针对每一种异常类型都定制专门的处理逻辑

try:
    print('===>1')
    # name
    print('===>2')
    l=[1,2,3]
    # l[100]
    print('===>3')
    d={}
    d['name']
    print('===>4')

except NameError as e:
    print('--->',e)

except IndexError as e:
    print('--->',e)

except KeyError as e:
    print('--->',e)


print('====>afer code')

万能异常：Exception

# -*-coding：utf-8 -*-
# BY WANGCC
try:
    print('===>1')
    # name
    print('===>2')
    l=[1,2,3]
    l[100]
    print('===>3')
    d={}
    d['name']
    print('===>4')

except Exception as e:
    print('异常发生啦：',e)

print('====>afer code')

raise 异常类型(值)

#主动触发异常：raise  异常类型(值)
# class People:
#     def __init__(self,name,age):
#         if not isinstance(name,str):
#             raise TypeError('名字必须传入str类型')
#         if not isinstance(age,int):
#             raise TypeError('年龄必须传入int类型')
#
#         self.name=name
#         self.age=age
#
# p=People('egon',18)