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Kirill Smelkov
cpython
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b9495c78
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b9495c78
authored
Sep 08, 2012
by
R David Murray
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closes #5088: document behavior of optparse defaults with 'append' action.
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@@ -1168,6 +1168,17 @@ must specify for any option using that action.
options.tracks.append(int("4"))
The ``append`` action calls the ``append`` method on the current value of the
option. This means that any default value specified must have an ``append``
method. It also means that if the default value is non-empty, the default
elements will be present in the parsed value for the option, with any values
from the command line appended after those default values::
>>> parser.add_option("--files", action="append", default=['~/.mypkg/defaults'])
>>> opts, args = parser.parse_args(['--files', 'overrides.mypkg'])
>>> opts.files
['~/.mypkg/defaults', 'overrides.mypkg']
* ``"append_const"`` [required: :attr:`~Option.const`; relevant:
:attr:`~Option.dest`]
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