Bug #4865

Non positional arguments are partially matched

Added by Stavros Sachtouris over 7 years ago. Updated about 7 years ago.

Status:Resolved Start date:01/09/2014
Priority:Medium Due date:01/17/2014
Assignee:Stavros Sachtouris % Done:


Category:kamaki Spent time: 3.00 hours
Target version:v0.13 Estimated time:3.00 hours


E.g. instead of --device-id a user may use --devi

This looks like argparse feature

Associated revisions

Revision b33d9050
Added by Stavros Sachtouris about 7 years ago

Disable argument abbreviation

Refs: #4865

Implementaton details: subclass ArgumentParser and override the
_get_option_tuples method. Replace option_string comparison
operator: == instead of .startswith
The rest of the method code is copy-pasted from python 2.7.3 argparse


#1 Updated by Stavros Sachtouris about 7 years ago

  • Status changed from New to Closed
  • Estimated time changed from 3.00 to 0.00

This behaviour is inherited from the python argparse module and it is not necessarily a bug

The ability to write --device instead of --device-id is nice, as long as there are no conflicts with other arguments
This concern is resolved by argparse which does not recognise partial arguments when they are ambiguous.

For example, the --size-min and --size-max arguments in kamaki image list can be shortened as


but nothing shorter, since anything shorter would be ambiguous.

#2 Updated by Vangelis Koukis about 7 years ago

  • Status changed from Closed to Assigned


this is certainly unwanted behavior, and bound to create problems.
Please disable this. A workaround exists here:


#3 Updated by Stavros Sachtouris about 7 years ago

  • Estimated time changed from 0.00 to 3.00

Vangelis, this particular workaround seems like a bad idea: a patch on argparse which is not included in any python 2.X version may cause more problems than it solves.

There is another workaround I've found a few months ago: http://stackoverflow.com/questions/10750802/disable-abbreviation/10751356#10751356
It is based on overwriting argparse behaviour.

Maybe the solution should be based on the later rather than the former.

Btw, I quote Jonathan Paugh's response from issue14910 : "I am dubious as to the use of this: I think resolving partial args is one of the best things invented since sliced bread"

(I don't necessarily agree)

#4 Updated by Vangelis Koukis about 7 years ago

I don't have a strong opinion on the way to disable the "feature", as long as it actually gets disabled.
Do whatever you think is best.

#5 Updated by Stavros Sachtouris about 7 years ago

  • Status changed from Assigned to Resolved
  • % Done changed from 0 to 100

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