Include module name on ImportError

[ncoghlan]

BPO	11356
Nosy	@birkenfeld, @ncoghlan, @cool-RR
Superseder	bpo-1559549: ImportError needs attributes for module and file name

^{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 2011-03-01.06:35:45.408>
created_at = <Date 2011-02-28.22:30:43.852>
labels = ['interpreter-core', 'type-feature']
title = 'Include module name on ImportError'
updated_at = <Date 2011-03-01.06:35:45.406>
user = 'https://github.com/ncoghlan'

bugs.python.org fields:

activity = <Date 2011-03-01.06:35:45.406>
actor = 'georg.brandl'
assignee = 'none'
closed = True
closed_date = <Date 2011-03-01.06:35:45.408>
closer = 'georg.brandl'
components = ['Interpreter Core']
creation = <Date 2011-02-28.22:30:43.852>
creator = 'ncoghlan'
dependencies = []
files = []
hgrepos = []
issue_num = 11356
keywords = []
message_count = 2.0
messages = ['129729', '129741']
nosy_count = 3.0
nosy_names = ['georg.brandl', 'ncoghlan', 'cool-RR']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = 'needs patch'
status = 'closed'
superseder = '1559549'
type = 'enhancement'
url = 'https://bugs.python.org/issue11356'
versions = ['Python 3.3']

[ncoghlan]

Catching ImportError in order to switch to an alternate implementation can mask real failures in imported modules. Attaching the module name as an attribute would allow this to be handled correctly by doing something like:

try:
import simplejson
except ImportError as err:
if err.module_name != 'simplejson':
raise
<backup plan>

See http://mail.python.org/pipermail/python-ideas/2011-February/009209.html

[birkenfeld]

This is a dupe of bpo-1559549.