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#5088: document behavior of optparse defaults with 'append' action.

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R David Murray 2012-09-08 16:45:35 -04:00
parent 8bdcdc235e
commit 14d66a98ed
1 changed files with 11 additions and 0 deletions
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Doc/library/optparse.rst
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@ -1165,6 +1165,17 @@ 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`]