python中的异常处理

主要用到 try...except...raise...finally...

1. try...except...

try:
    for i in range(1, 1000):
        print i
        time.sleep(1)
except KeyboardInterrupt:
    print 'My Interruption'

2. try...except...finally...(中途不论是否有异常，finally语句都会执行)

try:
    for i in range(1, 1000):
        print i
        time.sleep(1)
except KeyboardInterrupt:
    print 'My Interruption'
finally:　　　　　　
    print 'Exit'

3. try...raise...

try:
    for i in range(1, 1000):
        print i
        time.sleep(1)
        if i == 5:
            raise KeyboardInterrupt('Interruption')
except KeyboardInterrupt:
    print 'My Interruption'
finally:　　　　　　
    print 'Exit'   

以上只执行except和finally语句

try:
    for i in range(1, 1000):
        print i
        time.sleep(1)
        if i == 5:
            raise KeyboardInterrupt('Interruption')
#except KeyboardInterrupt:
    #print 'My Interruption'
finally:　　　　　　
    print 'Exit' 

以上只执行raise语句