paul j3 added the comment:
And only for integers smaller than 257!
The problem is with this test in `take_action` function
# error if this argument is not allowed with other previously
# seen arguments, assuming that actions that use the default
# value don't really count as "present"
if argument_values is not action.default:
seen_non_default_actions.add(action)
for conflict_action in action_conflicts.get(action, []):
if conflict_action in seen_non_default_actions:
msg = _('not allowed with argument %s')
action_name = _get_action_name(conflict_action)
raise ArgumentError(action, msg % action_name)
Specifically with the
argument_values is not action.default
test. In CPython integers below 257 are unique, so that
In [33]: int('10') is 10
Out[33]: True
In [34]: int('257') is 257
Out[34]: False
(and strings from 'sys.argv' do not match in the 'is' sense with strings set
via 'default'. So the problem is unique to small integers.)
The test is really meant to catch the default that is added in '_get_values()'
for positionals with optional nargs ('?').
This issue was raised by some PyPy developers several years ago.
PyPy does not treat the small integers as unique. I'll have to dig around to
see what the resolution was, if any.
For now the solution is to use a string '10' as the default.
----------
nosy: +paul.j3
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30163>
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