actions

Collection of custom argparse actions.

Classes

NullCountAction	Information about how to convert command line strings to Python objects.
ExtendConstAction	A derivative of _AppendConstAction and Python 3.8's _ExtendAction

class NullCountAction(option_strings, dest, default=None, required=False, help=None)

Bases: argparse._CountAction

Information about how to convert command line strings to Python objects.

Action objects are used by an ArgumentParser to represent the information needed to parse a single argument from one or more strings from the command line. The keyword arguments to the Action constructor are also all attributes of Action instances.

Keyword Arguments:

• which (- option_strings -- A list of command-line option strings) -- should be associated with this action.

• object (- dest -- The name of the attribute to hold the created)

• be (- nargs -- The number of command-line arguments that should) --

  consumed. By default, one argument will be consumed and a single value will be produced. Other values include:

  • N (an integer) consumes N arguments (and produces a list)

  • '?' consumes zero or one arguments

  • '*' consumes zero or more arguments (and produces a list)

  • '+' consumes one or more arguments (and produces a list)

  Note that the difference between the default and nargs=1 is that with the default, a single value will be produced, while with nargs=1, a list containing a single value will be produced.

• the (- metavar -- The name to be used for the option's argument with) -- option uses an action that takes no values.

• specified. (- default -- The value to be produced if the option is not)

• and (- type -- A callable that accepts a single string argument,) -- returns the converted value. The standard Python types str, int, float, and complex are useful examples of such callables. If None, str is used.

• None, (- choices -- A container of values that should be allowed. If not) -- after a command-line argument has been converted to the appropriate type, an exception will be raised if it is not a member of this collection.

• the -- command line. This is only meaningful for optional command-line arguments.

• argument. (- help -- The help string describing the)

• the -- help string. If None, the 'dest' value will be used as the name.

static _ensure_value(namespace, name, value)

__call__(parser, namespace, values, option_string=None)

class ExtendConstAction(option_strings, dest, const, default=None, type=None, choices=None, required=False, help=None, metavar=None)

Bases: argparse.Action

A derivative of _AppendConstAction and Python 3.8's _ExtendAction

__call__(parser, namespace, values, option_string=None)