optparse - dosn't distinguish between '--option' and '-option'

[kszawala]

BPO	4642
Nosy	@mdickinson

^{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 2008-12-12.17:29:13.999>
created_at = <Date 2008-12-12.14:16:43.849>
labels = ['extension-modules', 'type-bug']
title = "optparse - dosn't distinguish between '--option' and '-option'"
updated_at = <Date 2008-12-12.17:29:13.971>
user = 'https://bugs.python.org/kszawala'

bugs.python.org fields:

activity = <Date 2008-12-12.17:29:13.971>
actor = 'mark.dickinson'
assignee = 'none'
closed = True
closed_date = <Date 2008-12-12.17:29:13.999>
closer = 'mark.dickinson'
components = ['Extension Modules']
creation = <Date 2008-12-12.14:16:43.849>
creator = 'kszawala'
dependencies = []
files = []
hgrepos = []
issue_num = 4642
keywords = []
message_count = 2.0
messages = ['77670', '77679']
nosy_count = 2.0
nosy_names = ['mark.dickinson', 'kszawala']
pr_nums = []
priority = 'normal'
resolution = 'duplicate'
stage = None
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue4642'
versions = ['Python 2.5']

[kszawala]

I am using optparse for command-line parameters parsing. To follow
common naming convention I defined -d (minus followed by a single
character option) and --debug (double minus followed by a word).

It looks like optparse doesn't complain when -debug (single minus) is
specified and morover it doesn't recognize it as --debug.

I am using Python 2.5.2. Problem was observed on Linux but also occurs
on Windows.

[mdickinson]

Duplicate of issue bpo-4640.