Return error code python

なお、 タイトルで「 Pythonのプログラム」 としています が、 他の言語にもある程度適用できる考え方かと思います。. def sample_ 2( a, b) : : if a > b: return False, None :. して処理を継続させることができますが、 重要なのは そのために例外処理のコードを明示的に書かなければいけない点です。. Nothing says there is an error better than an exception. If you want to indicate the parameters are incorrect then use exceptions and put a helpful error message. Returning a result in this case is just confusing. You don' t need the break def do_ some_ stuff( array1, array2) : # Before doing stuff, check to ensure both arrays have the same length if len( array1)! = len( array2) : return - 1. Just return the error code. In this way the rest of the. exit with a string will work. The docs mention this use explicitly: In particular, sys.

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  • Video:Python return code

    Error python return

    exit( " some error message" ) is a quick way to exit a program when an error occurs. This common Python coding style assumes the existence of valid keys or attributes and catches exceptions if the assumption proves false. This clean and fast style is characterized by the presence of many try and except. Some systems have a convention for assigning specific meanings to specific exit codes, but these are generally underdeveloped; Unix programs generally use 2 for command line syntax errors and 1 for all other kind of errors. If you want your script to return values, just do return [ 1, 2, 3] from a function wrapping your code but then you' d have to import your script from another script to even have any use for that information: Return values ( from a. プログラムを終了させるPythonではプログラムを途中で終了させるにはsysモジュール のexit( ) を使います。 手順は. exit( ) は引数に文字列や整数の値を渡すことでエラー メッセージや終了コードを送ることができます。 sys. A non- zero exit code is treated as an abnormal exit, and at times, the error code indicates what the problem was. The standard convention for all C programs, including Python, is for exit( 0) to indicate success, and exit( 1) or.