异常

编程语言

329

异常

常见异常 :

assertionError assert (后面条件为假)
attributeError (尝试访问未知的对象属性)
index Error (索引超出序列范围)
keyError (字典中找到不存在的关键字)
osError (操作系统产生的异常)
nameError (尝试访问一个不存在的变量)
synataxError python (语法错误)
typeError (不同类型之间的无效操作)
zerodivisionError (除零错误)


try:
    with open("none.txt", "r", encoding = "utf-8") as f:
        print(f.read())
except OSError as reason:
    print("error ", str(reason)) #error [Errno 2] No such file or directory: 'none.txt'


try:
    a=int(input("请输入一个数"))
    result=8/a
    print(result)
except ValueError as reason: #输入不是数字
    print("error ", str(result))
except Exception as reason: #输入0
    print("annoymouse error %s"%str(reason))
except Exception as result: #二者都是捕获所有异常, 是等价的
    print("some error %s" %result)
except:
    print("some error")
else:
    print("none error")
finally:
    print("dont care error")

异常的传递


def func1():
    print("func1 start")
    1/0
    print("func1 end")

def func2():
    print("func2 start")
    func1()
    print("func2 end")

def main():
    try:
        func2()
    except Exception as op:
        print(op)

main()

# func2 start
# func1 start
# division by zero

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异常 3个月前

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