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例外処理 その1 -初心者メモ

Posted at

例外処理とは、エラーが出る可能性がある処理に対して、エラーが出ても(例外が発生しても)、代わりに実行される処理のこと。

def div(num1,num2):
  try:
    print(f'Answer= {num1/num2}')
 
 except ZeroDivisionError as e:
    print(e)

  except TypeError as t:
    print(t)

  else:
    print('正常に終了')

  finally:
    print('すべての処理が終了')

tryしてみて、エラーならexcept以下が実行される。

elseは、tryが成功したときに表示される。

finallyはtryの成功失敗にかかわらず実行される。

出力結果例

div(1,2)
#Answer= 0.5
#正常に終了
#すべての処理が終了

divide(1,0)
#division by zero
#すべての処理が終了しました
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