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argparse: abbreviated single-dash long options do not work with = #124345

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@serhiy-storchaka

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@serhiy-storchaka

argparse supports short options, single-dash long options and double-dash long options. Values for option can be specified as separate argument (for all types of options):

--option value -option value -o value 

It can also be grouped in a single argument with the option. In this case it should be separated by = from the option name:

--option=value -option=value -ovalue 

argparse also supports abbreviation of long options (enabled by default):

--opt value -opt value 

Abbreviated double-dash long options can be used with =:

--opt=value 

But this does not work with single-dash long options:

-opt=value 

This is definitely an omission. There are other bugs related to abbreviation (#104860) and use with = (#124305). There were many other bugs related to this code. This code is just not well tested.

The code for --opt=value is not tested as well -- breaking it does not break tests.

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3.12only security fixes3.13bugs and security fixes3.14bugs and security fixestype-bugAn unexpected behavior, bug, or error

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