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| -rw-r--r-- | Doc/library/optparse.rst | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/Doc/library/optparse.rst b/Doc/library/optparse.rst index d0783e7..c14b790 100644 --- a/Doc/library/optparse.rst +++ b/Doc/library/optparse.rst @@ -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`] |