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python基础复习(27)--异常处理

七千22 2022-07-13 阅读 57


#函数的异常补捉
def fun():
print("start")
n=1/0
print("end")

try:
fun()
except Exception as err:
print(err)


#如果fun中已经捕捉到了异常,那么主程序位置就捕捉不到了
def fun():
print("start")
try:
n=1/0
print("end")
except:
print("error")

try:
fun()
except Exception as err:
print(err)


#异常的传递
def A():
print("start A")
n=1/0
print("end A")

def B():
print("start B")
A()
print("end B")

try:
B()
print("done")
except Exception as err:
print(err)
print("finish")


#异常的传递
def A():
print("start A")
n=1/0
print("end A")

def B():
print("start B")
try:
A()
except Exception as err:
print(err)
print("end B")

try:
B()
print("done")
except Exception as err:
print(err)
print("finish")

#异常的传递,异常一直没有捕获,那就传递到系统,程序就会终止
def A():
print("start A")
n=1/0
print("end A")

def B():
print("start B")
A()
print("end B")

B()
print("finish")

#抛出异常
def mytime():
h=input("h:")
h=int(h)
if h<0 or h>23:
raise Exception("invalid hour")
m=input("m:")
m=int(m)
if m<0 or m>59:
raise Exception("invalid minute")
s=input("s:")
s=int(s)
if s<0 or s>59:
raise Exception("invalid secends")
print("%02d:%02d:%02d"%(h,m,s))

try:
mytime()
except Exception as err:
print(err)


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