python中的try

轉載：https://blog.csdn.net/watkinsong/article/details/27350553

try ... except ... else ... finally 

def exceptTeset():
    try:
        print("doing some work, and maybe exception will be raised")
        raise IndexError('Index error')
        print("IndexError('Index error')")
        #return 1
    except KeyError:
        print("in KeyError except")
        #return 2
    except IndexError:
        print("in IndexError except")
        #return 3
    except ZeroDivisionError:
        print("in ZeroDivisionError")
        #return 4
    else:
        print("no exception")
        #return 5
    finally:
        print("will be excuted anyway.")
        #return 6


if __name__ == "__main__":
    result = exceptTeset()
    print(result)

【註解】：

• finally中代碼無論怎麼樣都會被執行，即時前面的語句中包含了return關鍵字。
• 在try中執行代碼，如果不發生異常，在執行else和finally中代碼，如果發生異常，則except捕獲對應異常，執行處理代碼和finally最終代碼；