New submission from Fons Dijkstra <f...@xs4all.nl>:
Although it is possible to specify a default value for an append action,
either directly or through the set_default() function, it is not handled
correctly when this default is overruled by the user. Take for example
the following code:
import optparse
parser = optparse.OptionParser()
parser.add_option("-o", "--option", action = "append")
parser.set_defaults(option = ["a"])
options, args = parser.parse_args()
print options
When this is called without arguments the following is printed:
{'option': ['a']} # as expected
But when it is called with for example with -ob the following is
printed:
{'option': ['a', 'b']} # expected {'option': ['b']}
So the default option is also appended, even if the option is explicitly
defined by the user.
----------
components: Library (Lib)
messages: 80704
nosy: pycurry
severity: normal
status: open
title: optparse: inconsistent default value for append actions
type: behavior
versions: Python 2.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5088>
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