def __menuDefinition( self ) :

		result = IECore.MenuDefinition()
		if self.getPlug() is None :
			return result

		formats = [ GafferImage.Format.format( n ) for n in GafferImage.Format.registeredFormats() ]
		if not self.getPlug().ancestor( Gaffer.ScriptNode ).isSame( self.getPlug().node() ) :
			formats.insert( 0, GafferImage.Format() )

		currentFormat = self.getPlug().getValue()
		modeIsCustom = Gaffer.Metadata.plugValue( self.getPlug(), "formatPlugValueWidget:mode" ) == "custom"
		for fmt in formats :
			result.append(
				"/" + self.__formatLabel( fmt ),
				{
					"command" : functools.partial( Gaffer.WeakMethod( self.__applyFormat ), fmt = fmt ),
					"checkBox" : fmt in currentFormat and not modeIsCustom,
				}
			)

		result.append( "/CustomDivider", { "divider" : True } )

		result.append(
			"/Custom",
			{
				"command" : Gaffer.WeakMethod( self.__applyCustomFormat ),
				"checkBox" : modeIsCustom or currentFormat not in formats,
			}
		)

		return result
dataset/ETHPy150Open ImageEngine/gaffer/python/GafferImageUI/FormatPlugValueWidget.py/FormatPlugValueWidget.__menuDefinition/operator `==` -> `in`