Python异常处理

利用if条件避开异常

AGE=10
while True:
    age=input('>>: ').strip()
    if age.isdigit(): 
        age=int(age)
        if age == AGE:
            print('you got it')
            break

利用try…except

try:
    int("jiao")
##如果try里面的是异常，则执行except里面的
except EOFError as e:
    print(e)

except ImportError as e:
    print(e)

except ValueError as e:
    print(e)

万能异常Exception

try:
    int("ad")

except Exception as e:   ##只要是异常都能触发它
    pass

自定义异常

class YuanErro(BaseException):  ##必须继承于BaseException这个基类
    def __init__(self, msg):
        self.msg = msg
##需要重置__init__和__str__两个方法
    def __str__(self):
        return self.msg

try:
    raise YuanErro("hehe!")

except YuanErro as e:
    print(e)

hehe!