Raising exceptions from finally works better than advertised in the documentation

[ssegvic]

BPO	13705

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2012-01-03.22:31:00.401>
created_at = <Date 2012-01-03.22:13:08.206>
labels = ['type-feature', 'docs']
title = 'Raising exceptions from finally works better than advertised in the documentation'
updated_at = <Date 2012-01-03.22:31:00.400>
user = 'https://bugs.python.org/ssegvic'

bugs.python.org fields:

activity = <Date 2012-01-03.22:31:00.400>
actor = 'python-dev'
assignee = 'docs@python'
closed = True
closed_date = <Date 2012-01-03.22:31:00.401>
closer = 'python-dev'
components = ['Documentation']
creation = <Date 2012-01-03.22:13:08.206>
creator = 'ssegvic'
dependencies = []
files = []
hgrepos = []
issue_num = 13705
keywords = []
message_count = 3.0
messages = ['150544', '150546', '150547']
nosy_count = 3.0
nosy_names = ['docs@python', 'python-dev', 'ssegvic']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue13705'
versions = ['Python 3.2']

[ssegvic]

Hi,

The documentation says:
"""
If the finally clause raises another exception (...) the saved exception is lost.
"""

This does not appear to be true.
In the example below the backtrace shows both exceptions.

>>> import math
>>> try:
...   1/0
... finally:
...   math.sqrt(-1)
... 
Traceback (most recent call last):
  File "<stdin>", line 2, in <module>
ZeroDivisionError: division by zero

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<stdin>", line 4, in <module>
ValueError: math domain error

Cheers,

Siniša

[ssegvic]

Link to the documentation:
http://docs.python.org/py3k/reference/compound_stmts.html#id2

[python-dev]

New changeset c39fbb24b3f4 by Benjamin Peterson in branch '3.2':
exception support is correct now (closes bpo-13705)
http://hg.python.org/cpython/rev/c39fbb24b3f4