From bf2829b3de4086fbfbcd4a17ba9c1c63e1b0ed19 Mon Sep 17 00:00:00 2001 From: Inada Naoki Date: Fri, 6 Nov 2020 11:45:01 +0900 Subject: [PATCH] bpo-42179: Doc/tutorial: Remove mention of __cause__ (GH-23162) (cherry picked from commit bde33e428d5b5f88ec7667598fd27d1091840537) Co-authored-by: Inada Naoki --- Doc/tutorial/errors.rst | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/Doc/tutorial/errors.rst b/Doc/tutorial/errors.rst index 0ce96466e8c286..efe44da3043c5e 100644 --- a/Doc/tutorial/errors.rst +++ b/Doc/tutorial/errors.rst @@ -273,15 +273,15 @@ Exception Chaining ================== The :keyword:`raise` statement allows an optional :keyword:`from` which enables -chaining exceptions by setting the ``__cause__`` attribute of the raised -exception. For example:: +chaining exceptions. For example:: - raise RuntimeError from OSError + # exc must be exception instance or None. + raise RuntimeError from exc This can be useful when you are transforming exceptions. For example:: >>> def func(): - ... raise IOError + ... raise IOError ... >>> try: ... func() @@ -297,12 +297,11 @@ This can be useful when you are transforming exceptions. For example:: Traceback (most recent call last): File "", line 4, in - RuntimeError + RuntimeError: Failed to open database -The expression following the :keyword:`from` must be either an exception or -``None``. Exception chaining happens automatically when an exception is raised -inside an exception handler or :keyword:`finally` section. Exception chaining -can be disabled by using ``from None`` idiom: +Exception chaining happens automatically when an exception is raised inside an +:keyword:`except` or :keyword:`finally` section. Exception chaining can be +disabled by using ``from None`` idiom: >>> try: ... open('database.sqlite') @@ -313,6 +312,8 @@ can be disabled by using ``from None`` idiom: File "", line 4, in RuntimeError +For more information about chaining mechanics, see :ref:`bltin-exceptions`. + .. _tut-userexceptions: pFad - Phonifier reborn

Pfad - The Proxy pFad of © 2024 Garber Painting. All rights reserved.

Note: This service is not intended for secure transactions such as banking, social media, email, or purchasing. Use at your own risk. We assume no liability whatsoever for broken pages.

Alternative Proxies:

Alternative Proxy

pFad Proxy

pFad v3 Proxy

pFad v4 Proxy