twisted.python.constants.Flags : API documentation

A Flags subclass contains constants which can be combined using the common bitwise operators (|, &, etc) similar to a bitvector from a language like C.

Class Method _constantFactory For FlagConstant instances with no explicitly defined value, assign the next power of two as its value.

Inherited from Values:

Class Method lookupByValue Retrieve a constant by its value or raise a ValueError if there is no constant associated with that value.

Inherited from _ConstantsContainer (via Values):

Method	__new__	Classes representing constants containers are not intended to be instantiated.
Class Method	lookupByName	Retrieve a constant by its name or raise a `ValueError` if there is no constant associated with that name.
Class Method	iterconstants	Iteration over a `Names` subclass results in all of the constants it contains.
Class Variable	_constantType	Specified by a `_ConstantsContainer` subclass to specify the type of constants allowed by that subclass.
Class Variable	_enumerants	A `dict` mapping the names of constants (eg `NamedConstant` instances) found in the class definition to those instances.

@classmethod
def _constantFactory(cls, name, descriptor): (source)

overrides twisted.python.constants._ConstantsContainer._constantFactory

For FlagConstant instances with no explicitly defined value, assign the next power of two as its value.

Parameters	name	The name of the constant to create.
	descriptor	An instance of a `FlagConstant` which is assigned to `name`.
Returns	Either the value passed to the `descriptor` constructor, or the next power of 2 value which will be assigned to `descriptor`, relative to the value of the last defined `FlagConstant`.

t.p.c.Flags(Values) : class documentation