while True:
 try:
  x = int(input('請輸入X:'))
  y = int(input('請輸入Y:'))
  value = x / y
  print('x/y is',value)
 except Exception as e:  # 發(fā)生異常時執(zhí)行
  print('不正確的輸入：', e)
  print('請重新輸入')
 else:  # 未發(fā)生異常時執(zhí)行
  break

def fetcher(obj, index):
 return obj[index]
 
x = 'spam'
 
try:
 print fetcher(x, 3)
except Exception:
 print 'hhh'
else:
 print 'has no exception'
 print fetcher(x, 2)
 print '---' * 10
 
try:
 print fetcher(x, 4)
except IndexError:
 print 'got exception'
else:
 print 'has no exception'
 print fetcher(x, 2)

m
has no exception
a
------------------------------
got exception