1、解析
python try是用來捕獲異常。如果某段代碼發生了錯誤,可以用try來執行這段代碼;如果try的代碼塊出現錯誤,則try代碼省下的代碼不會繼續執行,而是直接跳轉到catch代碼塊,catch就是錯誤處理代碼塊。
2、案例
(1)捕獲異常的方式
try:
a = b
b = c
except Exception,data:
print Exception,":",data
'''輸出:<type 'exceptions.Exception'> : local variable 'b'
referenced before assignment '
(2)採用sys模組回溯最後的異常
try:
a = b
b = c
except:
info = sys.exc_info()
print info
print info[0]
print info[1]
'''輸出:
(<type 'exceptions.UnboundLocalError'>, UnboundLocalError("local
variable 'b' referenced before assignment",),
<traceback object at 0x00D243F0>)
<type 'exceptions.UnboundLocalError'>
local variable 'b' referenced before assignment
'''