# 异常处理

try:
    open("asdfsa");
    print(num);
except ( NameError , FileNotFoundError ) as e:
    print("捕获到异常 :",e)
except Exception as e:
    print("捕获到异常 :",e)
else:
    print("没出现异常就会执行这里的代码")
finally:
    print("异常处理完成")

# 抛出自定义异常
# raise 引发一个自定i的异常
class ShortInputException(Exception):
    """自定义的异常类"""
    def __init__(self , length , atleast ):
        # super().__init__()
        self.length = length ;
        self.atleast = atleast ;

try:
    raise ShortInputException(len(s), 3)
except ShortInputException as e:
    print("捕获到异常 :长度:%d %s"%(e.length,e.atleast))
except Exception as e:
    print("捕获到异常 :",e)
finally:
    print("处理自定义异常完成")

# 异常处理中抛出异常