[ python-Feature Requests-1089955 ] optparse .error() should print options list

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Feature Requests item #1089955, was opened at 2004-12-22 13:53
Message generated for change (Comment added) made by gward
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https://sourceforge.net/tracker/?func=detail&atid=355470&aid=1089955&group_id=5470

Category: Python Library
Group: None
>Status: Closed
>Resolution: Rejected
Priority: 5
Submitted By: Mike Orr (hierro)
Assigned to: Greg Ward (gward)
Summary: optparse .error() should print options list

Initial Comment:
Why doesn't optparse.OptionParser.error() print the
list of correct options along with the error message
and usage?  This is what the user needs to know
whenever there's an error.  One can override this in a
subclass, but it's frustrating to have to do it every
time.  

To do this, change the first line in
OptionParser.error() from:

    self.print_usage(sys.stderr)

to:

    self.print_help(sys.stderr)
    print >>sys.stderr

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>Comment By: Greg Ward (gward)
Date: 2005-01-05 08:20

Message:
Logged In: YES 
user_id=14422

Because very few conventional Unix programs act this way:

$  -z
ls: invalid option -- z
Try `ls --help' for more information.
$ tar -a
tar: invalid option -- a
Try `tar --help' for more information.
$ cp -z
cp: invalid option -- z
Try `cp --help' for more information.

Note the pattern.  (Hmmm: perhaps Optik should throw in a
"try --help" if there's a help option in the current parser.)


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