try...except...else...finally... 測試敘述

參考來源:http://www.python.org/dev/peps/pep-0341/


try:
     <測試敘述>
except:
     <如果測試敘述發生異常則執行此區塊>
else:
     <如果測試敘述未發生異常則執行此區塊>
finally:
     <不論測試敘述是否發生異常皆執行此ㄑㄩ>



++++++++++++++++++++++++++++++++++
try:
raise ValueError
    
except:
print 'EXCP_BLOCK'
else:
print 'ELSE_BLOCK'
finally:
print 'FINAL_BLOCK'

=================== RESTART ==========================

>>> 

EXCP_BLOCK

FINAL_BLOCK

try:

print 'TRY_BLOCK'

    

except:

print 'EXCP_BLOCK'

else:

print 'ELSE_BLOCK'

finally:

print 'FINAL_BLOCK'

======= RESTART ================================

>>> 

TRY_BLOCK

ELSE_BLOCK

FINAL_BLOCK