optparse: bad exception handling when giving no value to an option requiring one

[GwendalLEBIHAN]

BPO	9563
Nosy	@bitdancer

^{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 2010-08-11.01:14:56.805>
created_at = <Date 2010-08-10.21:25:27.074>
labels = ['type-bug', 'library']
title = 'optparse: bad exception handling when giving no value to an option requiring one'
updated_at = <Date 2010-08-11.01:14:56.804>
user = 'https://bugs.python.org/GwendalLEBIHAN'

bugs.python.org fields:

activity = <Date 2010-08-11.01:14:56.804>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2010-08-11.01:14:56.805>
closer = 'r.david.murray'
components = ['Library (Lib)']
creation = <Date 2010-08-10.21:25:27.074>
creator = 'Gwendal.LE.BIHAN'
dependencies = []
files = []
hgrepos = []
issue_num = 9563
keywords = []
message_count = 4.0
messages = ['113560', '113568', '113571', '113576']
nosy_count = 2.0
nosy_names = ['r.david.murray', 'Gwendal.LE.BIHAN']
pr_nums = []
priority = 'normal'
resolution = 'out of date'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue9563'
versions = ['Python 2.6']

[GwendalLEBIHAN]

Having created the parser this way:

optparser=OptionParser()
optparser.add_option("--share-dir",dest="share_dir",default="/usr/share")
options,args=optparser.parse_args()

And calling the program this way:

appname --share-dir

I get the following exception, which is not caught:

options,args=optparser.parse_args()
File "/usr/lib/python2.6/optparse.py", line 1394, in parse_args
stop = self._process_args(largs, rargs, values)
File "/usr/lib/python2.6/optparse.py", line 1434, in _process_args
self._process_long_opt(rargs, values)
File "/usr/lib/python2.6/optparse.py", line 1509, in _process_long_opt
option.process(opt, value, values, self)
UnboundLocalError: local variable 'value' referenced before assignment

[bitdancer]

2.6 no longer receives bug fixes now that 2.7 is out. Is this still a problem in 2.7? (My testing indicates that it isn't.)

[GwendalLEBIHAN]

I confirm. Fixed in Python 2.7.
I didn't have Python 2.7 installed since it's not in the Ubuntu repository yet.

[bitdancer]

Thanks for the confirmation.