Bases: Command
Emit a warning for use of a deprecated option
Invoked by the application when the command is run.
Developers implementing commands should override
take_action().
Developers creating new command base classes (such as
Lister and ShowOne) should override this
method to wrap take_action().
Return the value returned by take_action() or 0.
Bases: ABCMeta
Bases: CommandManager
Noop subclass for transition purposes.
Timing Implementation
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