twisted.python.constants.FlagConstant : API documentation

FlagConstant defines an attribute to be a flag constant within a collection defined by a Flags subclass.

FlagConstant is only for use in the definition of Flags subclasses. Do not instantiate FlagConstant elsewhere and do not subclass it.

Method	__init__	Undocumented
Method	__or__	Define `\|` on two `FlagConstant` instances to create a new `FlagConstant` instance with all flags set in either instance set.
Method	__and__	Define `&` on two `FlagConstant` instances to create a new `FlagConstant` instance with only flags set in both instances set.
Method	__xor__	Define `^` on two `FlagConstant` instances to create a new `FlagConstant` instance with only flags set on exactly one instance set.
Method	__invert__	Define `~` on a `FlagConstant` instance to create a new `FlagConstant` instance with all flags not set on this instance set.
Method	__iter__
Method	__contains__
Method	__nonzero__
Method	_realize	Complete the initialization of this `FlagConstant`.

Inherited from _Constant:

Instance Variable	name	A `str` giving the name of this constant; only set once the constant is initialized by `_ConstantsContainer`.
Method	__repr__	Return text identifying both which constant this is and which collection it belongs to.
Method	__lt__	Implements `<`. Order is defined by instantiation order.
Method	__le__	Implements `<=`. Order is defined by instantiation order.
Method	__gt__	Implements `>`. Order is defined by instantiation order.
Method	__ge__	Implements `>=`. Order is defined by instantiation order.
Instance Variable	_index	A `int` allocated from a shared counter in order to keep track of the order in which `_Constant`s are instantiated.
Instance Variable	_container	The `_ConstantsContainer` subclass this constant belongs to; `None` until the constant is initialized by that subclass.

def _realize(self, container, names, value): (source)

overrides twisted.python.constants._Constant._realize

Complete the initialization of this FlagConstant.

This implementation differs from other _realize implementations in that a FlagConstant may have several names which apply to it, due to flags being combined with various operators.

Parameters	container	The `Flags` subclass this constant is part of.
	names	When a single-flag value is being initialized, a `str` giving the name of that flag. This is the case which happens when a `Flags` subclass is being initialized and `FlagConstant` instances from its body are being realized. Otherwise, a `set` of `str` giving names of all the flags set on this `FlagConstant` instance. This is the case when two flags are combined using `\|`, for example.

Parameters	flag	The flag to test for membership in this instance set.
Returns	`True` if `flag` is in this instance set, else `False`.

t.p.c.FlagConstant(_Constant) : class documentation